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1
Nguyen, Xuan Hoang, e Hoang Viet Le. "Solid waste management in Mekong Delta". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-88553.
Testo completoAbstract (sommario):
Municipal solid waste (MSW) in Vietnam has been increasing quickly and became one of the most considered environmental problems in Mekong Delta (MD) region covering 13 provinces and municipalities in the south of Vietnam. With a considerably large amount of MSW, the region produces about 5% of the total amount of MSW of the country. The collection rate of solid waste is about quite high (65 - 72%) in the cities and rather low (about 40 - 55%) in the rural areas, with a high content in organic matter (about 60 - 85%). The climate of MD can be characterized as tropical and monsoonal with a high rate of humidity and a strong impact of flooding. Like other regions too, the MSW collection and treatment system is still underdeveloped and rudimentary, with disposal sites being the sole dumping method of the unsorted MSW remaining untreated by any mechanical and biological pre-treatment steps. Within this paper, the current treatment, management and operation of MSW systems are introduced, as well as the identification of advantages and disadvantages, environmental impacts, potential risks of the MSW system within the impact of global climate change. The situation of MSW treatment and management is correlated with the climate change impact and the integrated solid waste management is introduced as a new approach for adapting the environmental protection awareness by considering the climate change for the longterm sustainable development orientationSự gia tăng chất thải rắn ở các đô thị Việt Nam ngày càng nhanh và chất thải rắn đang là một trong những vấn đề môi trường được quan tâm hàng đầu. Đồng bằng Sông Cửu Long (ĐBSCL) nơi có đến 13 tỉnh và thành phố nằm ở phía Nam Việt Nam. Với lượng chất thải không nhỏ, chiếm khoảng 5 % tổng lượng chất thải rắn sinh hoạt của quốc gia. Tỷ lệ thu gom chất thải rắn thấp, chiếm khoảng 65 - 72 % ở thành thị, tỷ lệ này ở nông thôn thấp 40 - 55%, chất thải có hàm lượng hữu cơ cao chiếm khoảng 60 - 85%. Khí hậu nhiệt đới gió mùa với độ ẩm không khí cao và chịu ảnh hưởng lớn của lũ lụt hàng năm. Cũng như các khu vực khác, hệ thống thu gom và xử lý rác thải ở khu vực ĐBSCL còn rất thô sơ và lạc hậu, bãi rác là nơi duy nhất tiếp nhận trực tiếp hổnhợp rác thải không phân loại và qua bất kỳ công đoạn tiền xử lý nào. Trong phạm vi bài viết này, chúng tôi giới thiệu hoạt động vận hành hệ thống quản lý và xử lý rác đô thị trong khu vực đồng thời phân tích các thuận lợi và bất lợi, cũng như các tác động môi trường, những rủi ro tiềm ẩn trong điều kiện ảnh hưởng của biến đổi khí hậu toàn cầu - khu vực ĐBSCL là nơi chịu ảnh hưởng nặng nề nhất. Tình hình quản lý và xử lý rác được cân nhắc trong điều kiện tác động của biến đổi khí hậu, đồng thời quản lý tổng hợp rác thải cũng được đề xuất như một các tiếp cận mới nhằm đáp ứng nhiệm vụ bảo vệ môi trường trong điều kiện biến đổi khí hậu theo định hướng phát triển bền vững lâu dài
2
Paik, SongYi. "Salt-tolerant rice variety adoption in the Mekong River Delta". Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/94147.
Testo completoAbstract (sommario):
Rice production plays an important role in the economy of the Mekong River Delta (MRD), but rice production is endangered by sea-level rise and the associated increased incidence of salinity intrusion. This study examines the diffusion of salt-tolerant rice varieties (STRVs) in the MRD that were promoted through Consortium for Unfavorable Rice Environment (CURE) activities. Evidence is found of widespread adoption in salinity-prone areas, with CURE related varieties covering 47% of rice area in at least one of two growing seasons surveyed, but that adopting areas are highly clustered. Multivariate analysis reveals that location characteristics associated with high risk of salinity inundation, rather than individual characteristics associated with household risk preferences, explain the observed pattern of adoption in the MRD. In particular, CURE-related varieties are disproportionately likely to be adopted in non-irrigated areas and in irrigated areas that are not protected by salinity barrier gates. The results imply that CURE has effectively targeted unfavorable rice growing environments and that efforts to further diffuse STRVs need to both increase the area of suitability through further varietal adaptation and promote adoption in existing suitable areas by taking advantage of strong neighborhood externalities in household adoption decisions. In terms of varietal performance, inconclusive evidence is found of higher yields of CURE-related varieties in a low-salinity year. Further, any yield gains are more than off-set by lower market prices for CURE-related varieties.Rice is a staple crop in the Vietnamese diet and one of Vietnam's leading exports. The Mekong River Delta (MRD) accounts for more than 90 percent of rice exports. However, rice production in the MRD is endangered by saltwater intrusion due to rising sea-levels. Farmers have adopted rice varieties that are tolerant to rice to reduce their production risk that were promoted through Consortium for Unfavorable Rice Environment (CURE) activities. This study examines the rates of adoption of these CURE-related varieties, the reasons farmers choose CURE-related varieties, and variety performance on farmers' fields. Results from a household-level survey show at 47% of fields in salinity-prone areas of the MRD grow a CURE-related variety in at least one of the areas two main rice-growing seasons. Farmers are particularly likely to adopt CURE-related varieties on fields that are not protected against salinity intrusion by gates. Adoption decisions are also highly correlated with neighbors’ decisions within villages. Finally, CURE- and non-CURE-related varieties yields are similar in a year with low levels of salinity intrusion. But revenues from CURE-related varieties are slightly lower due to their lower market price, suggesting CURE-related varieties are a relatively low-cost insurance policy for MRD rice farmers in salinity-prone areas against future salinity intrusion.
3
Dun, Olivia. "Shrimp, salt and livelihoods: migration in the Mekong Delta, Vietnam". Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/12486.
Testo completoAbstract (sommario):
This thesis examines how different categories of households (non-migrating, partially-migrating and entire-migrating households) from Cai Nuoc district, Ca Mau province in the lower saline-intrusion zone of the Mekong Delta, Vietnam have adjusted to increasing salinisation and rapid agricultural change in the decade since the year 2000. In that year shrimp aquaculture was introduced and rapidly adopted in Cai Nuoc district, but within a few years it had contributed to significant environmental degradation. Limited opportunities for agriculture, and disappointments with shrimp production, in increasingly saline-affected areas resulted in some households experiencing greater vulnerability. Greater vulnerability was experienced in terms of the ability of households to obtain food and earn a living from their land, exposure to financial debt, a reduction in school education participation, new health risks, loss of physical and natural assets, and an inability of households to escape the trappings of poverty. This resulted in both individual and household migration in the face of environmental degradation and limited income generation. While migration proved to be a helpful solution and positive strategy for the majority of households in enabling them to sustain livelihoods, some migrants also experienced further vulnerability in their destinations, working under unsafe conditions in factories or construction sites, and living in crowded and unsanitary boarding houses. By contrast, other households were able to adapt, in-situ, to the increasing salinisation of the landscape. Household assets, including land size, the relative age of household members and non-farm sources of income at the time of environmental change, were the main differences between households that influenced the ability or inability to adapt and thus shaping potential migration outcomes. Migration could be an adaptation strategy, a failure to adapt or a combination of both.
4
Vuong, Ngoc Thuy. "Household food insecurity and sanitation in the Mekong delta, Vietnam". Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/203190/1/Ngoc%20Thuy_Vuong_Thesis.pdf.
Testo completoAbstract (sommario):
This study investigated household food insecurity, associated factors, and potential outcomes including livelihood assets, diet quality, water and sanitation, and health in the northern and southern provinces of the Vietnamese Mekong Delta. The study surveyed 552 households and the results found that over one-third of households were food insecure in the last month with direct effects on physical and mental health. Diet diversity was significantly impacted with food insecure households consuming less nutritious diets. Multi-sectorial approaches that align policies of socio-economic development, food, water, sanitation, and health to address food insecurity and potential nutrition and health outcomes are warranted.
5
Phan, Thanh Lam. "Sustainable development of export-orientated farmed seafood in Mekong Delta, Vietnam". Thesis, University of Stirling, 2014. http://hdl.handle.net/1893/20752.
Testo completoAbstract (sommario):
Aquaculture is playing an important role in the development of fisheries in Vietnam, a role which has accelerated since 2000. Sustainability in aquaculture is receiving increasing attention, and this issue is not only the concern of government, but also stakeholders participating in the value chain. Therefore, this study aims to identify sustainability issues of farmed seafood by assessing the main sustainability issues raising concern. The Global Value Chain framework described by Gereffi et al. (2005) is applied for this study to explore the business relationships in supply chain and the perceptions of sustainability concerned by the value chain actors. A combination of qualitative and quantitative methods was used to collect data. An assessment of four species cultured on the Mekong Delta, the countries farmed seafood ‘hub’, found a clear distinction between species cultured with a local domestic market orientation (Giant Freshwater Prawn Macrobrachium rosenbergii; and Tilapia Oreochromis niloticus) and the two key export commodities - Striped catfish (Pangasianodon hypophthalmus) and Penaeid shrimp (Penaeus monodon & Litopenaeus vannamei). These orientations were based on a range of factors including the development of effective seed supplies and the cultural value of marketing in the live format. This study, conducted in ten provinces in the Mekong Delta from 2009 to 2013 had a focus on understanding the export-orientated commodities, striped catfish and shrimp through collection of baseline information on the value chain of farmed seafood, focusing on the farming sector, the actors and institutions involved and beneficiaries. Sustainability issues and perceptions of experts (top-down) and primary stakeholders (bottom-up) opinions were assessed through participatory workshops. Shrimp and striped catfish production are mainly farmed for export, with 83% and 95% of its production, respectively, leaving the country mainly after processing. Currently, mainly families operate small-/medium-scale farms; while large-farms are integrated within seafood processors. Production efficiency of large-farms tends to be better than small-/medium farms. Many striped catfish and shrimp farms are likely to reach several standard criteria such as economic feed conversion ratio (eFCR), stocking density, no banned chemical/drug and wild-seed use, and land property rights; however, there were still many standard criteria that existing farms could not meet such as effluent management, farm registration, fishmeal control, farm hygiene and record-keeping requirement. Hence, current farming practices, especially small-/medium farms have a long way to go to meet emergent international food standards. Recently, many small-/medium catfish farms faced problems with low fish prices, so they have had to cease catfish farming activities and temporarily stop farming; while some larger farms also had to temporarily stop farming. Therefore, fish price has tended to be a main driving force for catfish farm changes. In the shrimp industry, there were technical changes occurring in the high intensity level of shrimp farms (HiLI); whereas, the remaining shrimp farms had fewer changes in farm management. Most HiLI shrimp farms were affected by AHPNS disease, which was a main factor driving their farm changes. Many perceptions of sustainability were identified by stakeholder groups, however seven sustainability issues had a high level of agreement among stakeholders including input cost, capital & credit costs, unstable markets, government regulation & policy, disease, seed quality, water quality and water availability factors. Hatcheries, farmers and manager groups were more concerned about environmental issues; while for the input suppliers and processors, economics was the main issue. Farmers and processors were two main actors that played an important role in the production process of the value chain. Small-/medium farms dominated the number of farms overall and still played an important role in primary production. However, small-scale farms were considered as more vulnerable actors in the value chain, and they faced more difficulties in meeting increasing requirements on food quality/safety. To maintain the position in the value chain, the solutions could be horizontal and vertical coordination. Thus policy makers will need to find ways to include them in the planning processes. To reach sustainability will require the efforts of direct stakeholders, the role of the state agencies is essential in negotiation and diplomacy to create partnerships with the seafood importing countries. However, efforts to develop sustainable production become impossible without participation from importers, retailers and consumers.
6
Phan, Thi Hai Van. "L'arsenic dans les écosystèmes du sud-est asiatique : Mekong Delta Vietnam". Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAU003/document.
Testo completoAbstract (sommario):
On retrouve des contaminations d’aquifèr à l’arsenic dans touts les deltaï de l'Asie du Sud-Est, y compris dans le delta du Mékong, ce qui affecte la santé de millions de personnes. L’arsenic est très sensible aux fluctuations des conditions redox qui sont générés par les cycles alternés humides/secs pendant la saison de mousson. Une étude sur les caractéristiques géophysiques et chimiques du sol et des eaux souterraines dans le district de An Phu, dans le haut du delta du Mékong au Vietnam, suggère une forté contamination à l’As dans cette région. Les données chimiques et géophysiques indiquent une forte corrélation entre concentrations dans les eaux souterraines anoxiques et conductivité des sols. La liberation de l’arsenic est associée à la dissolution réductrice induih par des microorganisms des colloïdes et (oxyhydr)oxydes de fer dans des conditions d'oxydo-réduction oscillantes. La présence de bactéries sulforéductrices a le potentiel de stabiliser l’arsenic dans la phase solide et de l’atténuer dans la phase aqueuse par adsorption / désorption de l’arsenic sur les (oxyhydr)oxydes, et / ou sulfures de fer via la formation de complexes thiols. En raison de la teneur en pyrite élevée dans les sédiments, l'oxydation de la pyrite peut abaisser le pH et conduire à l'inhibition de la réduction microbienne du sulfate et aime empêcher la séquestration de l’arsenic dissous. Bien que le cycle biogéochimique de l’arsenic dans un système dynamique d’oxydoréduction soit une problématique complexe, il a été possible de renforcer notre compréhension de ce systèmeAquifer arsenic (As) contamination is occuring throughout deltaic areas of Southeast Asia, including the Mekong Delta, and affects the health of millions of people. As is highly sensitive to fluctuations of redox conditions which are generated by the alternating wet-dry cycles during the monsoonal seasons. A survey of geophysical and chemical characteristics of soil and groundwater in the An Phu district, located in the vicinity of the Mekong Delta in Vietnam, shows the occurrence high As aqueous concentration in this region. Chemical and geophysical data indicate a strong positive correlation between As concentrations in the anoxic groundwater and conductivity of soils. In addition, mechanisms of As release are shown to be associated with colloidal and iron (oxyhydr)oxides which undergo microbial mediated reductive dissolution under redox oscilatting conditions. The presence of sulfate microbial reduction potentially stabilizes As in the solid phase and diminish As in the aqueous phase through the adsorption/desorption of As onto iron (oxyhydr)oxides and/ or sulfides with formation of thiols complexes in solid phase. Because of the high pyrite content in sediment, pyrite oxidation may drop in pH values, leads to inhibition of sulfate reducing bacteria and reduces sequestration of dissolved As. Although the biogeochemical cycling of redox sensitive species such as As in dynamic systems is challenging, it has been possible to strengthen our collective understanding of such system
7
Nguyen, Vo Chau Ngan, Trung Hieu Phan e Hoang Nam Vo. "Review on the most popular anaerobic digester models in the Mekong Delta". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-88455.
Testo completoAbstract (sommario):
In Vietnam, the research and application of biogas technology were given a considerable attention in past 30 years. There is several biogas plant models apply in the suburban and rural areas where most people’s life is based on animal husbandry. Each biogas plant model own strong points or weakness that adapt to detail circumstances. The biogas plants play a key role within the VACB farming system especially in the Mekong Delta where produce more than 50% of yearly national agriculture production. This paper gives a comprehensive overview on the popular biogas models in the Mekong Delta through its development history. Knowing on the presented biogas technology in the Mekong Delta will lead the biogas-related organizations or private on biogas development at this regionỞ Việt Nam việc nghiên cứu và ứng dụng công nghệ khí sinh học đã được chú ý trong 30 năm gần đây. Một số mô hình khí sinh học đã và đang được lắp đặt tại các vùng ngoại ô và nông thôn là những nơi tập trung nhiều hộ dân chăn nuôi heo. Có nhiều mô hình khí sinh học đã được triển khai, trong đó mỗi mô hình đều có những điểm mạnh và điểm yếu đáp ứng theo từng yêu cầu cụ thể. Ở ĐBSCL nơi sản xuất trên 50% sản lượng nông nghiệp của cả nước, hầm ủ khí sinh học đóng một vai trò quan trọng trong mô hình canh tác VACB. Bài báo này trình bày chi tiết các kiểu hầm ủ khí sinh học phổ biến tại ĐBSCL tương ứng với từng thời điểm phát triển của công nghệ này. Sự hiểu biết về các kiểu hầm ủ khí sinh học hiện tại ở ĐBSCL sẽ giúp các tổ chức hoặc cá nhân có liên quan trong việc định hướng phát triển công nghệ khí sinh học cho toàn vùng
8
Bui, Ngoc Thi Quynh. "Accomodating traditions of hospitality in a tourist region : the Mekong Delta, Vietnam". Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8593/.
Testo completoAbstract (sommario):
While there has been a significant focus on how hospitality was commodified, commercialised and standardised in the literature, less attention is given to the extent of which local traditions and hospitality change and adapt to the demand of tourists. Through an empirically grounded investigation, this thesis at micro-level gives an insight to how local hospitality and traditions in Mekong Delta (Vietnam) transform in homestay practice under the pressure of tourism development. Normally, the local traditions and hospitality are offered by the host and experienced by the guests. However by focusing on contact zone, the settings and decoration of homestays, this thesis shows this mechanism in Mekong Delta is not one way but a dynamic process. The guests do not only passively receive but also have influences on what the hosts can offer. In fact, the homestay providers have capitalised on what tourists want to see. As consequence, local traditions and hospitality are changing and subject to re-invention to adapt to legal requirements, tourists demands, and social context. Ironically, tourists are using homestay believing they are experiencing true Vietnamese culture, while actually the local Vietnamese people are changing their traditional home styles and behaviour to accommodate the tourists.
9
Chapman, Alexander. "Evaluating an adaptation : rice-sediment trade-offs in the Vietnamese Mekong Delta". Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/400969/.
Testo completoAbstract (sommario):
The exceptional vulnerability of river deltas to climate change and development pressures means there is an urgent need to implement systemic adaptation actions. One of the most important cases is the Vietnamese Mekong Delta (VMD). This thesis performs a novel application of a system dynamics methodology to evaluate the VMD’s dyke network as a hard adaptation to changes in the region’s hydrological conditions. In doing so it makes a methodological and case study contribution to an emerging research body on the evaluation of adaptation action. Policy analysis and stakeholder consultation are first performed to elucidate the drivers behind the policy to heighten the VMD’s dyke network. A farmer survey is then executed within the rice-growing community in order to quantify the socioeconomic impacts of the adaptation. Finally, a system dynamics model is built to explore the dynamics controlling the impacts of the adaptation and the efficacy of alternative policies for the local agricultural system. A key original theme running through this thesis is its consideration of the socioeconomic role of fluvial sediment in the system. The principle finding, on which both the model and survey agree, is that the switch to high dyke compartments in the VMD(the adaptation) is exacerbating the divide between land-rich and land-poor farmers through the promotion of triple-cropping and sediment exclusion. Factors including the loss of free sediment-bound nutrients for fertilisation, and increasing fertilisation demands, reduce the resilience of poorer farmers to increasing and unpredictable fertiliser prices. The policy currently recommended by the provincial governments to encourage sediment accretion and mitigate the rate of relative sea-level rise is to advocate triennial inundation of paddies. The data presented herein suggest such a policy is sub-optimal,further increasing the risk of debt for smaller-scale farming operations. The testing of various different success criteria weightings did, however, suggest that the less rigid policy of allowing sporadic floodplain inundation and sediment deposition during intense flooding events is preferable to most stakeholder groups.
10
Andersson, Daniel. "Waste Management in the Mekong Delta : Characterisation and evaluation of organic waste". Thesis, Linnéuniversitetet, Institutionen för biologi och miljö (BOM), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-66928.
Testo completoAbstract (sommario):
This degree project investigated landfills that takes care of municipal solid waste in an area around the Mekong delta, namely An Giang province, Vietnam. The main objective for this study was to provide basic work in order to create a discussion with the local food markets to separate the household’s food waste from the rest. Such a discussion is possible to create through collaboration with local authorities and inform or guide stakeholders on how waste management can be improved, out of existing knowledge from Sweden. Therefore, this study aims to illuminate and give knowledge for improvements in questions regarding efficiency, organisation, participation, recycling and opportunities associated with a more efficient waste management system.Since a significant percentage of the household waste generated in Long Xuyen City, An Giang province are organic, the opportunity to convert organic waste into soil amendments was examined. Leachate from one of the landfills in the area was also analysed in order to get further understanding for its composition, focusing on organic parameters.Det här examensarbetet undersökte deponier som tar hand om hushållsavfall i ett område runt Mekongdeltat, närmare bestämt An Giang provinsen, Vietnam. Det främsta målet för den här studien var ett ge underlag till att skapa en diskussion med lokala matmarknader för att få dem att separera hushållens matavfall från övrigt avfall. En sådan diskussion är möjlig att skapa genom samarbete mellan lokala myndigheter och att informera eller vägvisa intressenter om hur avfallshanteringen kan förbättras, ut ifrån befintlig kunskap från Sverige. Därför fokuserar den här studien på att förklara och ge kunskap för förbättringar i frågor rörande effektivitet, organisation, deltagande, återvinning och möjligheter associerade med ett mer effektivt avfallshanteringssystem. Eftersom en stor andel av hushållsavfallet som genereras i Long Xuyen, An Giang-provinsen är organiskt, undersöktes möjligheten att konvertera organiskt avfall till jordförbättringsmedel. Lakvatten analyserades från en av deponierna i området för att få en djupare förståelse för dess sammansättning, med fokus på organiska parametrar.
11
Ho, Loc Huu. "Ecosystem Services Approach for Environment Decision Making Applications in the Mekong Delta, Vietnam". Kyoto University, 2017. http://hdl.handle.net/2433/227612.
Testo completo
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Phan, Ky Trung, Thi Le Hang Tran, Thi My Linh Nguyen e Pham Dang Tri Van. "Assessing the groundwater resources management in the Bac Lieu Province, Mekong delta, Vietnam". Technische Universität Dresden, 2016. https://tud.qucosa.de/id/qucosa%3A32628.
Testo completoAbstract (sommario):
The research aims to assess the current groundwater resources management in Bac Lieu province. The combination of descriptive statistic and interview approach (including individual interview and key informant panel) were applied based on the principles of water governance framework developed by the Organization of Economic Co-operation and Development (OECD) to assess the policy coherence and the transparency and stakeholder engagement of the groundwater management. The study showed that the current groundwater resources management improved overtime; however, the policies were not completely sufficient and the responsibility of the units related to the groundwater resources management was not indicated clearly yet. Thus, overlaps in function of different management units are found and the access of the local people to the groundwater management was limited. In addition, the stakeholder involvement in managing the groundwater resources was in short of both amount and qualification. The separation of powers seems to be higher and higher, the local government has the main responsibility to manage the groundwater and the communities, especially the local people still have low rate of participation in the groundwater resources management process.Nghiên cứu được thực hiện nhằm đánh giá hiện trạng quản lý nguồn tài nguyên nước dưới đất (NDĐ) tại tỉnh Bạc Liêu. Sự kết hợp giữa phương pháp thống kê mo tả va phương pháp phỏng vấn (bao gồm phỏng vấn cá nhân và phỏng vấn chuyên gia)dựa trên những quy định về quản trị tài nguyên nước của Tổ chức Hợp tác và Phát triển Kinh tế (OECD – Organization for Economic Cooperation and Development) được áp dụng để đánh sự chặt chẽ của các chính sách quản lý, sự minh bạch của công tác quản lý và sự tham gia của các bên có liên quan. Kết quả cho thấy, cơ chế quản lý nguồn tài nguyên NDĐ đã và đang dần hoàn thiện, song các chính sách quản lý vẫn còn chưa đầy đủ và trách nhiệm của các đơn vị quản lý vẫn chưa được quy định rõ ràng. Vì vậy, đến nay công tác quản lý còn phát sinh sự chồng chéo và thiếu sự phối hợp giữa các cơ quan chức năng có liên quan cũng như sự liên kết giữa cơ quan quản lý địa phương và người sử dụng tài nguyên NDĐ. Thêm vào đó, các bên có liên quan tham gia vào quản lý nguồn tài nguyên NDĐ còn hạn chế về cả số lượng và năng lực, trong đó chính quyền địa phương là đơn vị quản lý chính; do vậy, sự tập trung quyền hạn vào một chủ thể (chính quyền địa phương) là rất cao và sự tham gia của cộng đồng, đặc biệt là người sử dụng NDĐ, còn hạn chế.
13
Sakamoto, Toshihiro. "Spatio-temporal analysis of agriculture in the Vietnamese Mekong delta using MODIS imagery". Kyoto University, 2008. http://hdl.handle.net/2433/136689.
Testo completo
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Nguyen, Thuy Thi Hong. "Modeling socio-economic and environmental impacts of shrimp farming in Mekong Delta, Vietnam". Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Thesis/Spring2009/T_Nguyen_042809.pdf.
Testo completoAbstract (sommario):
Thesis (M.S. in environmental science)--Washington State University, May 2009.Title from PDF title page (viewed on June 9, 2009). "School of Earth and Environmental Sciences." Includes bibliographical references (p. 60-61).
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Nguyen, Xuan Hoang. "Integrated municipal solid waste management approach in adaptation to climate change in Mekong Delta". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-99273.
Testo completoAbstract (sommario):
A fast increase of municipal solid waste (MSW) has become the most concerning environmental problem in Vietnam, especially in the Mekong Delta region, that is considered one of the most vulnerable deltas to climate change in the world. There are 12 provinces and one central city in MD that occupy about 12% of the whole area of the nation with 5% of MSW generated. However, there is no currently effective management system in place for treatment and management of MSW in the MD. Landfill is the sole treatment option for MSW right now. With a low-level plain, MD is facing the most serious environmental problem in the near future with an effect of climate change and sea level rising. The landfill should not be considered for long-term use in this area. Suitable treatment options for MSW should be applied together with other solutions for reuse, recycling and reduction of MSW as well as pollution prevention issue. An integrated MSW management approach in adaptation to climate change is considered necessarySự tăng nhanh chất thải rắn đã trở thành vấn đề vấn đề môi trường được quan tâm nhất ở Việt Nam, đặc biệt là ở khu Đồng bằng Sông Cửu Long một trong những đồng bằng dễ bị tổn thương bởi sự biến đổi khí hậu nhất trên thế giới. Đồng bằng Sông Cửu Long có 12 tỉnh và một thành phố trực thuộc trung ương, chiếm 12% diện tích của cả nước với khoảng 5% lượng chất thải rắn phát sinh. Tuy nhiên, hiện nay chưa có một hệ thống quản lý hiệu quả cho chất thải rắn ở khu vực. Bãi rác là lựa chọn xử lý duy nhất ở thời điểm này. Với cao độ thấp, Đồng bằng Sông Cửu Long đang đối mặt với ảnh hưởng nghiêm trọng của các vấn đề môi trường trong tương lai gần bởi ảnh hưởng của sự biến đổi khí hậu và nước biển dâng. Về lâu dài bãi rác không nên sử dụng ở khu vực này. Các lựa chọn xử lý thích hợp cho chất thải rắn cần được áp dụng cùng với các giải pháp khác như tái sử dụng, tái chế và giảm thiểu chất thải rắn cũng như các giải pháp ngăn ngừa ô nhiễm. Cách tiếp cận quản lý tổng hợp chất thải rắn nhằm ứng phó sự biến đổi khí hậu cần được xem xét
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Roddar, Linnea, e luz Isabella Da. "The dimensions of flooding in the Mekong delta : A struggle in a changing climate". Thesis, Linnéuniversitetet, Institutionen för samhällsvetenskaper, SV, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-9822.
Testo completoAbstract (sommario):
Climate change and a changing flood pattern create urgent issues for low-lying land suchas the Vietnamese Mekong delta. Harmful levels of flooding, drought and extreme weatherconditions are increasingly striking rural communities in the delta. Millions of peopleliving in the area are very poor and the vulnerability is high to a change in the floodingpattern. Political incentives, programs and policies have been introduced in order to adaptto the changes but the complex issues are hard to tackle.This study tries to understand the impact that flooding pattern has in the Mekong delta areaand what the communities do to adopt do their new situation, both on a top downperspective and local coping strategies within the communities. The SRL (SustainableRural Livelihood) approach has been used to analyze the conditions. It gives a holisticperspective on societies and highlights that there are several dimensions to a problem. Anumber of interviews with women and men working on different levels within the field ofclimate adaption, climate change, rural development, environment and migration werecompleted.The findings show that the Vietnamese Government has tried to solve the situation throughlaws and policies but this method has shown not to be enough. The communities haveorganized ways of dealing with their own problems but issues are severe and the regionalco-operations need to be dealt with seriously. When conditions worsen, what is being donetoday is not enough to save The Mekong delta or its people.
17
Men, Bui Xuan. "Feeding and management systems for smallholder duck production in the Mekong Delta of Vietnam /". Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2001. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=009768689&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Testo completo
18
Luu, Truc T. T. "Investigation into jaundice in farmed catfish (Pangasianodon hypophthalmus, Sauvage) in the Mekong Delta, Vietnam". Thesis, University of Stirling, 2013. http://hdl.handle.net/1893/13060.
Testo completoAbstract (sommario):
Disease outbreaks continue to be a major problem in the sustainable development of the aquaculture industry. Clinical outbreaks can negatively impact on the welfare of the fish and the economic gain derived from this industry. Jaundice observed as a yellow colouration in the abdominal skin, sclera of the eyes and fin bases is a significant health problem affecting the Vietnamese freshwater catfish industry. This study was designed to investigate jaundice of farmed catfish, Pangasianodon hypophthalmus using several complementary approaches. These included clinical investigations and identification of potential aetiological agents as well as epidemiological analyses to identify farm-based risk factors for this economically devastating condition occurring in the catfish farms of the Mekong Delta. The results of this survey demonstrated that the jaundice was not linked to a single geographical location as affected fish were found widely distributed throughout the five main production areas. Nor was any association found between any weight groupings, feed type or feeding regime applied in the affected farms. The highest prevalence occurred between June to October and fish mortalities ranged from 1 to 10% in the study sites. The duration of this condition was significantly correlated (P < 0.05) to mortality but not to total farm area, depth of pond, stocking density, or amount of water exchanged. The number of fish ponds affected was not as high in the large-scale farms compared to the small-scale farms. The results from the clinical description study showed that the affected fish were suffering a form of jaundice or icterus. Histological examination revealed a number of serious pathologies in the affected fish. Spleenomegaly was associated with the loss of cell structure and connective tissue and the haematopoietic tissue had large areas of necrosis. In the liver, histological changes consisted of vasculitis and multifocal to diffuse hepatocellular necrosis. The presence of haemosiderin was observed in melano-macrophage centres in the spleen and kidney of jaundiced fish. No single pathogen was identified in the jaundiced fish. Myxosporean infection was found in both apparently normal fish and jaundiced fish. However, there was a definite tendency for jaundiced fish to be more heavily infected. Histopathological examination found several changes that could not be ascribed to specific aetiological factors and presume that both groups (jaundiced alone and myxosporean-affected jaundiced fish) have similar lesions. The results of this study would suggest that the parasite identified as M. pangasii was not a primary pathogen associated with the haemolytic jaundice. Neither were the gills myxosporeans associated with the haemolytic jaundice and they may be considered more as a nuisance rather than as primary pathogens in farmed P. hypophthalmus in the Mekong Delta, Vietnam. Univariate analysis of the whole dataset showed several variables were significantly associated with the haemolytic jaundice. However, none of the variables achieved lasting statistical relevance in multivariable models. In conclusion, this study identified a haemolytic jaundice condition affecting farmed P. hypophthalmus in Vietnam, but no single aetiological agent or farm based risk factor was identified with this condition. Several priority areas for further work were identified and include a prospective, longitudinal cohort study to identify further the risk factors associated with the clinical jaundice condition.
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Biggs, David Andrew. "Between the rivers and tides : a hydraulic history of the Mekong Delta, 1820-1975 /". Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/10389.
Testo completo
20
Johansson, Anders. ""Life is Chaos Now" : Water, Modernity and Changing Landscapes in the Mekong Delta, Vietnam". Thesis, Uppsala universitet, Institutionen för kulturantropologi och etnologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-386040.
Testo completoAbstract (sommario):
This study details the effects of climate change and market fluctuations on the rural district of Cu Lao Dung located in the Mekong Delta of southern Vietnam. Using theoretical concepts on modernity, the environment and water from researchers Arjun Appadurai, Tim Ingold and Veronica Strang I study the political ecology of the Delta. Through interviews with farmers I found that climate change and market fluctuations are stalling economic development and significantly worsening already strong migration flows, leading to many people of working age leaving the district. Insufficient government support and dire climate projections means that the problems observed on Cu Lao Dung are only posed to grow worse.
21
Besemer, Kirsten Laurisse. "Rural livelihoods and inequality under trade liberalisation : a case study of southern Vietnam". Thesis, University of Chester, 2012. http://hdl.handle.net/10034/253692.
Testo completoAbstract (sommario):
The purpose of this mixed-methods case study research is to discover how, in relation to trade liberalisation in Vietnam's Mekong Delta, intangible assets affect livelihood outcomes of the ethnic majority Kinh and the ethnic minority Khmer people. Methods used include a random survey of 150 ethnic majority (Kinh) rice farmers combined with focus group data from Khmer ethnic minority people. Data shows that lack of access to information about the changing economic circumstances generated by trade reform has caused farmers to take sub-optimal decisions about the diversification of their crops. The economic outcomes on Khmer farmers have also been negatively affected by a lack of information, compounded by rigid gender roles, lack of education, discrimination, language problems and isolation from the majority ethnic group. These factors have contributed considerably to the negative outcomes of liberalisation, including loss of land, and have impeded people's ability to make use of emerging opportunities, including better access to markets and new ways of making a livelihood. This research shows that intangible assets interact with trade liberalisation to exacerbate existing inequalities.
22
Marks, Brian. "Small Fry in a Big Ocean: Change, Resilience and Crisis in the Shrimp Industry of the Mekong Delta of Việt Nam". Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/193955.
Testo completoAbstract (sommario):
The development of shrimp aquaculture in the Mekong Delta of Viet Nam is implicated in several patterns of local and regional change. These change trajectories are the emergent properties of complex processes embedded in particular social and spatial contexts. While places have become more interconnected through the global shrimp trade, those interconnections have been highly uneven, distributing risks and rewards disproportionately and producing new forms of conflict and cooperation among participants in the production network.Land use and farming systems in the coastal delta have changed profoundly in recent years. While some areas have become effectively `locked in' to shrimp farming due to environmental changes initiated by salt-water aquaculture, others have remained more flexible, able to rotate rice and shrimp seasonally. Hydrologic conditions, water infrastructures, and farmer experience all contribute to the path-dependence of these change trajectories, but commodity prices exhibit the strongest influence on their direction. Price stabilization may contribute to making prices a sustaining, `slow' variable in system change, not a disruptive `fast' one, heightening overall resilience.The production network of Mekong Delta shrimp is articulated through a variety of socially embedded relationships. Most producers are linked with international markets through informal ties with input suppliers based on trust and shrimp buyers, a relationship marked by opportunism. Processors operate through long-term informal relations with importers based on quality and consistency. This variegated network of relationships means farmers bear the brunt of price shocks, but processors lack quality assurance and traceability. Efforts to link chain participants into closer affiliation must pay attention to these relationships' effects on commodity chain governance.The globalization of the shrimp industry brought about conflicts between producers in the Mekong and Mississippi Deltas. Feminist geographers have posited several responses to globalization, from `counter-topographies' to `diverse economies/resubjectivization.' Living in Viet Nam and working with shrimp producers, I attempted to use these approaches to articulate an internationalist and trans-regional politics. Interactions with people there primarily resubjectivized me and reinforced national-scaled spatial imaginaries, however. Nevertheless, being `Uncle America' offered an insightful perspective into how some Vietnamese understood themselves and Viet Nam's tortured relationship with the U.S.
23
Binh, Nguyen Thanh [Verfasser]. "Vulnerability and adaptation to salinity intrusion in the Mekong delta of Vietnam / Nguyen Thanh Binh". Bonn : Universitäts- und Landesbibliothek Bonn, 2015. http://d-nb.info/1077388489/34.
Testo completo
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Pham, Cong Huu [Verfasser]. "Planning and Implementation of the Dyke Systems in the Mekong Delta, Vietnam / Cong Huu Pham". Bonn : Universitäts- und Landesbibliothek Bonn, 2011. http://d-nb.info/1016217986/34.
Testo completo
25
Unverricht, Daniel [Verfasser]. "Hydro-, morpho- and sediment-dynamic processes in the subaqueous Mekong Delta, Southern Vietnam / Daniel Unverricht". Kiel : Universitätsbibliothek Kiel, 2017. http://d-nb.info/1138979627/34.
Testo completo
26
Chun, Jane M. "Livelihoods under stress : household assets and responses to environmental change in the Mekong Delta, Vietnam". Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:db88c118-2287-46aa-8793-37b764f38047.
Testo completoAbstract (sommario):
This thesis is a response to broad stroked claims that climate change and sea-level rise will cause mass displacements in areas such as the Mekong Delta. Instead, I argue for a more nuanced approach to understanding vulnerability and household response measures in contexts of environmental stress, and highlight the importance of deciphering differentiations of vulnerability across households of varying characteristics. I propose that in this way, by empirically understanding differentiated household vulnerabilities and response measures to stress rather than focusing on one type of stressor (environmental change) and response (migration), we would be better positioned to holistically address the root causes of vulnerability. To this end, I take a micro household-level approach, using an asset vulnerability framework, to assess the role of various household assets in mediating vulnerability and resilience in the rural Mekong Delta context. As a result, we are able to understand the interactions of numerous elements, including the effects of environmental stress and mobility decision-making processes, within the context of household asset profiles, which are in turn shaped by the broader political ecology. The main findings of this study furthermore include the ‘counterintuitive’ role of environmental stress, where it is found to be one of many stressors, often paling in comparison to the pressure of others. In the process of analysing resettlement outcomes, we encounter the process of vulnerability shifts, whereby some vulnerabilities are alleviated while others are increased as a result of resettlement. Finally, in terms of the link between environmental change and migration, a direct relationship is found to be tenuous. Instead, the key drivers, deterrents, and facilitators of migration are identified, pointing to the significance of assets and their role in shaping mobility decisions and outcomes for households. This leads us to not only think about those who move, but also those who do not have the option to move as a result of their poor asset profiles.
27
DOAN, VAN BINH. "IMPACTS OF UPSTREAM DAM DEVELOPMENT ON FLOW, SEDIMENT AND MORPHOLOGICAL CHANGES IN VIETNAMESE MEKONG DELTA". Kyoto University, 2019. http://hdl.handle.net/2433/244533.
Testo completo
28
Cao, Xuan Cuong. "A remote sensing assessment of anthropogenic-induced wetland degradation of the Vietnam Mekong River Delta". Thesis, Curtin University, 2016. http://hdl.handle.net/20.500.11937/54172.
Testo completoAbstract (sommario):
Wetlands are one of the most important components shaping the natural landscape of the Vietnam Mekong River Delta (VMRD). The assessment of wetland change is particularly important for their management in this region. This study monitors the change of wetland in western VMRD from 1998 to 2016 using remotely sensed imagery and multiple data fusion techniques. Key results indicate that grassland has experienced a significant loss of between 71.9-78.5% since 1998 due to land-use diversification.
29
Ngo, Xuan Quang, Ngoc Chau Nguyen, Dinh Tu Nguyen, Van Lam Pham e Ann Vanreusel. "Distribution pattern of free living nematode communities in the eight Mekong estuaries by seasonal factor". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-126834.
Testo completoAbstract (sommario):
The temporal variation of nematode communities in eight mouth stations of the Mekong River system was investigated in order to compare the change between the dry and the wet season. The nematode data was analysed by multivariate techniques such as SIMPROF, MDS, ANOSIM and SIMPER in the software PRIMER v.6 – PERMANOVA. Our results showed that average dissimi-larity between seasons of the nematode communities in each station was high. Seasonal factor did not affect strongly their distribution pattern. Dominant genera Desmodora and Oncholaimellus usually occurred in the sand stations and Parodontophora and Halalaimus were characteristic for the silty group in both seasons. The spatial variations in this estuarine area have an influence that is larger than seasonal factorsSự phân bố theo thời gian của quần xã tuyến trùng sống tự do vùng cửa sông Mekong được nghiên cứu nhằm đánh giá sự khác biệt của chúng trong mùa mưa và mùa khô. Dữ liệu của tuyến trùng được xử lý và phân tích đa biến như SIMPROF, MDS, ANOSIM và SIMPER bằng phần mềm PRIMER v.6 – PERMANOVA. Kết quả nghiên cứu cho thấy sự khác biệt theo mùa trong quần xã tuyến trùng tại mỗi điểm là khá lớn nhưng yếu tố mùa không ảnh hưởng gì tới mô hình phân bố của chúng. Một số giống ưu thế trong nền đáy cát như Desmodora and Oncholaimellus trong khi đó Parodontophora và Halalaimus thích nghi nền bùn sét phù sa vẫn hiễn diện trong cả 2 mùa. Kết quả nghiên cứu cũng cho thấy sự biến động trong không gian ở đây lớn hơn sự biến động về mùa vụ
30
Nguyen, Quy-Hanh [Verfasser]. "Another epistemic culture : Reconstructing knowledge diffusion for rural development in Vietnam's Mekong Delta / Quy-Hanh Nguyen". Bonn : Universitäts- und Landesbibliothek Bonn, 2014. http://d-nb.info/1060045168/34.
Testo completo
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Hung, Nguyen Nghia [Verfasser], e András [Akademischer Betreuer] Bárdossy. "Sediment dynamics in the floodplain of the Mekong Delta, Vietnam / Nguyen Nghia Hung. Betreuer: András Bárdossy". Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2012. http://d-nb.info/1021343994/34.
Testo completo
32
Nguyen, Vo Chau Ngan, Thi Thuy Nguyen e Le Phuong Nguyen. "The potential of electricity generation from the major agricultural wastes in the Mekong Delta of Vietnam". Technische Universität Dresden, 2018. https://tud.qucosa.de/id/qucosa%3A33318.
Testo completoAbstract (sommario):
Agricultural activities produce a large quantity of waste each year in the Mekong Delta. For example, appropriately 26.86 million tons of rice straw, 5.37 million tons of rice husks, 1.33 million tons of bagasse and 0.59 million tons of corn straw were produced in 2016. Despite such a huge quantity of agricultural waste, the waste has been rarely used effectively. Around 54.1 - 98.0% of rice straw is normally burnt on the field; only 20 - 50% of rice husk is used for pellet or energy purposes; a few sugar-cane factories apply bagasse feeding to steam cookers, and a small quantity of corn straw is used as livestock feeding. If this biomass source is used for electricity generation, in theory, for the period of 2006 - 2020, it is estimated that this source can potentially generate 1203 million MWh/year from rice straw, 236 million MWh/year from rice husk, 45 million MWh/year from bagasse, and 40 million MWh/year from corn straw. Electricity generation of biomass source will not only solve the problem of environmental pollution caused by agricultural waste but also meet increasing energy demands for socio-economic development in this region.Hàng năm lượng chất thải phát sinh từ một số loại hình canh tác nông nghiệp chính ở ĐBSCL rất lớn. Chỉ tính riêng năm 2016 ghi nhận thải ra khoảng 26,86 triệu tấn rơm rạ; 5,37 triệu tấn vỏ trấu; 1,33 triệu tấn bã mía và 0,59 triệu tấn thân cây bắp. Lượng chất thải phát sinh lớn nhưng các biện pháp sử dụng những nguồn sinh khối này chưa đa dạng, rơm rạ phần lớn được người dân đốt trực tiếp ngay trên đồng ruộng chiếm 54,1 - 98,0% lượng rơm rạ thải ra; chỉ có khoảng 20 - 50% lượng vỏ trấu được sử dụng; bã mía chỉ được một số nhà máy sử dụng để đốt cho lò hơi; một lượng nhỏ thân cây bắp được người dân sử dụng cho chăn nuôi. Nếu có thể tận dụng các nguồn sinh khối này để sản xuất điện thì tiềm năng lý thuyết ước tính từ năm 2005 đến 2020 của rơm rạ là 1203 triệu MWh/năm; vỏ trấu là 236 triệu MWh/năm; bã mía là 45 triệu MWh/năm; và thân cây bắp là 40 triệu MWh/năm. Sản xuất điện từ các nguồn sinh khối này không chỉ giải quyết lượng phế phẩm nông nghiệp phát sinh, giảm thiểu ô nhiễm môi trường mà còn có thể tạo ra nguồn điện cung cấp cho nhu cầu phát triển của vùng.
33
Ba, Hélène Aminatou. "Contribution of contract farming to sustainable value chain upgrading in the Mekong River Delta in Vietnam". Thesis, Paris Est, 2019. http://www.theses.fr/2019PESC0025.
Testo completoAbstract (sommario):
Les mutations et la libéralisation des marchés agricoles et alimentaires mondiaux ont accéléré la formation de relations verticales entre producteurs et firmes agro-industrielles et la diffusion de l’agriculture dite contractuelle dans les secteurs de la production et de la commercialisation des produits agricoles. L'agriculture contractuelle est un accord entre un exploitant agricole et un acheteur (ou entreprise), établi avant la saison de production, pour une quantité et une qualité spécifiques du produit, avec sa datede livraison à un prix parfois préétabli. Le contrat garantit au producteur la vente assurée de sa production et une assistance technique et financière (crédit, technologie,intrants agricoles). L'acheteur quant à lui, a la garantie d'une offre régulière du produit et du contrôle de la qualité.Cette thèse vise à évaluer le rôle de l'agriculture contractuelle dans la durabilité des chaînes de valeur du riz au Vietnam.Dans la sphère sociale de la durabilité, nous avons démontré que les modèles d’agriculture contractuelle privilégient davantage les moyennes ou grandes exploitations agricoles du fait des coûts de transaction accompagnant le contrat et le volume de production désiré. Cela engendre l’exclusion des petits agriculteurs qui ont de faibles capacités de production. Toutefois, la participation à un système d'intégration horizontale permet de lever cette contrainte. Sur le plan économique, les producteurs sous contrat gagnent plus que les producteurs sans contrat (environ 121 USD/hectare). Finalement, sur le plan environnemental, les producteurs sous contrat sont disposés à adopter des pratiques respectueuses de l'environnement. Cependant, les coûts élevés des certifications environnementales découragent les firmes à inclure ces normes environnementales dans les attributs de contratIn recent years, the structure of the Vietnamese rice sector has changed. From a highly fragmented value chain producing rice for low value-added markets, the shift toward more vertically integrated and coordinated value chains through contract farming has begun to emerge. Contract farming is used as a tool to govern more effectively rice quality and penetrate new and lucrative markets for higher quality rice.Many empirical studies have assessed the role of contract farming in developing economies. Contract farming is perceived as an engine for rural development and a golden opportunity for farmers to have direct access to modern markets, agricultural inputs, credit, and technical support. Worldwide, contract farming adoption is promoted as an institutional innovation. In the Vietnamese rice sector, there is a specific legislation to encourage its diffusion such as the Small Farm Large Field program.This thesis aims at assessing the contribution of contract farming to internalize sustainable production standards in rice value chains. The central assumption of this thesis is that some contract attributes may contribute to improving sustainability. A set of attributes of performance declined in sustainable indicators was selected to test our research hypothesis. The attributes of performance stem from the Sustainable Rice Platform’s principles of sustainable rice production and the existing contract attributes in the Mekong River Delta.In the economic dimension of sustainability, we found that participation in contract farming improves the welfare of rice farmers as farmers selling their paddy using a contract gain, on average, $121 per hectare of paddy more compared to farmers producing outside of a contract. The increase in price is mainly a result of an increase in the selling price (price premium).In the social principle of sustainability, we found that participation in contract farming could improve the welfare of small rice farmers through rent and risk-sharing. Export firms share some of its profits with farmers through a price premium. However, due to the large heterogeneity of contract farming models in the Vietnamese rice sector, not all contract models facilitate risk-sharing. In a marketing contract, farmers bear all the production risks whereas in resource contracts some of the production risks may shift to the export firms. Therefore, resource contracts are more likely to improve equity through risk-sharing between farmers and export firms. Moreover, participation in resource contracts is found to improve farmers’ financial inclusion. Export firms are willing to prefinance farmers under contract. However, the opportunity cost of prefinancing may include the loss of farmers’ autonomy. Evidence from our discrete choice experiment reveals a conflicting interest between farmers and export firms regarding the decision rights in a contract. Last but not least, smallest farmers were excluded from contract farming as firms did not always want to support the transaction costs of dealing with numerous individual farmers. However, our findings suggest that the scale-bias could be successfully relaxed through the Small Farm Large Field program.Finally, in the environmental dimension of sustainability, we examined both firms’ and farmers’ prospective responses to the internalization of sustainability through contract farming using an experimental approach. Farmers are found willing to internalize the environmental dimension of sustainability through contract farming in exchange for a price premium. Export firms are found less likely to implement the GlobalG.A.P./VietGAP or the Pesticide free production standards. The cost of such standard implementation and the lack of institutional support are more likely to justify this outcome
34
Bui, Thi Lien Ha. "Impacts of traditional husbandry practices on exploitable levels of genetic diversity in cultured 'Tra' catfish (Pangasianodon hypophthalmus) in the Mekong Delta, Vietnam". Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/46957/1/Thi_Lien_Ha_Bui_Thesis.pdf.
Testo completoAbstract (sommario):
Sutchi catfish (Pangasianodon hypophthalmus) – known more universally by the Vietnamese name ‘Tra’ is an economically important freshwater fish in the Mekong Delta in Vietnam that constitutes an important food resource. Artificial propagation technology for Tra catfish has only recently been developed along the main branches of the Mekong River where more than 60% of the local human population participate in fishing or aquaculture. Extensive support for catfish culture in general, and that of Tra (P. hypophthalmus) in particular, has been provided by the Vietnamese government to increase both the scale of production and to develop international export markets. In 2006, total Vietnamese catfish exports reached approximately 286,602 metric tons (MT) and were valued at 736.87 $M with a number of large new export destinations being developed. Total value of production from catfish culture has been predicted to increase to approximately USD 1 billion by 2020. While freshwater catfish culture in Vietnam has a promising future, concerns have been raised about long-term quality of fry and the effectiveness of current brood stock management practices, issues that have been largely neglected to date.
In this study, four DNA markers (microsatellite loci: CB4, CB7, CB12 and CB13) that were developed specifically for Tra (P. hypophthalmus) in an earlier study were applied to examine the genetic quality of artificially propagated Tra fry in the Mekong Delta in Vietnam. The goals of the study were to assess: (i) how well available levels of genetic variation in Tra brood stock used for artificial propagation in the Mekong Delta of Vietnam (breeders from three private hatcheries and Research Institute of Aquaculture No2 (RIA2) founders) has been conserved; and (ii) whether or not genetic diversity had declined significantly over time in a stock improvement program for Tra catfish at RIA2. A secondary issue addressed was how genetic markers could best be used to assist industry development. DNA was extracted from fins of catfish collected from the two main branches of the Mekong River inf Vietnam, three private hatcheries and samples from the Tra improvement program at RIA2.
Study outcomes:
i) Genetic diversity estimates for Tra brood stock samples were similar to, and slightly higher than, wild reference samples. In addition, the relative contribution by breeders to fry in commercial private hatcheries strongly suggest that the true Ne is likely to be significantly less than the breeder numbers used; ii) in a stock improvement program for Tra catfish at RIA2, no significant differences were detected in gene frequencies among generations (FST=0.021, P=0.036>0.002 after Bonferroni correction); and only small differences were observed in alleles frequencies among sample populations.
To date, genetic markers have not been applied in the Tra catfish industry, but in the current project they were used to evaluate the levels of genetic variation in the Tra catfish selective breeding program at RIA2 and to undertake genetic correlations between genetic marker and trait variation. While no associations were detected using only four loci, they analysis provided training in the practical applications of the use of molecular markers in aquaculture in general, and in Tra culture, in particular.
35
Pham, Long Kim. "GIS-based modelling of agrochemical use, distribution and accumulation in the Lower Mekong Delta, Vietnam : a case study of the risk to aquaculture". Thesis, University of Stirling, 2012. http://hdl.handle.net/1893/16466.
Testo completoAbstract (sommario):
In recent years, the Mekong delta has been strongly developed both for agriculture and aquaculture. However, there is scope for a negative impact of agriculture on aquaculture in term of production and quality of seafood products. Specifically, the large amount of pesticides imported and used in the Mekong delta not only help agriculture purposes but can also easily enter aquatic systems and affect aquaculture. Pesticides can be transported in the environment by chemo-dynamic procedures and hydrological processes. As a result, pesticides used in agriculture become dispersed and their residues in sediment, water and biota have been detected in the Mekong delta. This study investigated the overall pesticide process including pesticide use, modelling pesticide accumulation and evaluating the potential impact on aquaculture sites for some target aquatic species. The risk of pesticides use in the Mekong delta was addressed in three stages: (1) investigating current pesticide use status in the Mekong delta; (2) modelling pesticide loss and accumulation; (3) classifying pesticide risk areas for aquaculture of target cultured species. A survey of 334 farms covering a total area of ~20,000km2 in the Mekong delta took place between 2008 and 2009. Information on pesticide types and quantities was recorded using questionnaires, and it was found that 96 pesticides in 23 groups were popularly used for agricultural purposes. Dicarboximide, Carbamate and Conazole had the highest use at ~3000, ~2000 and ~2000 g/ha/year respectively. The survey revealed an increase in pesticide use per hectare since previous surveys in the Mekong delta in 1994, 2000, and 2004. However, the highly persistent compounds (WHO classification classes II, III and IV) appeared to have reduced in use. Insecticides previously represented >50% of the total pesticides used, however, the resent survey has shown their use has decreased to ~38%.There was a parallel increase in use of fungicides from previous levels of <30% of total pesticides to more recently ~41%. The combination of pesticide information and geo-location data enabled display and analysis of this data spatially using a Geographic Information System (GIS). A pesticide loss and accumulation model was established through combination of several sub-models including sediment loss and accumulation, direct loss, and water runoff, all of which were implemented and integrated within the GIS environment. MUSLE (Modified Universal Soil Loss Equation) was used to estimate sediment loss and accumulation in the Mekong delta and the Curve Number method (CN Method) was applied to predict water runoff and discharges and flow accumulation. Modelling commenced from the first pesticide application in April, based on 4 day time-steps. All mathematical calculations run within each time step automatically reiterated in the following time step with the new input datasets. The results from fuzzy classification of the pesticide model outcomes were considered in terms of the 96hr lethal concentration (LC50) in order to classify the risk and non-risk areas for catfish and tiger shrimp culture. The sediment loss and accumulation model shows that the highest loss of sediment was in the rainy season, especially in May to October. Vegetables and short term crop areas were found be most strongly eroded. The MUSLE model showed that the highest sediment accumulation was in the hilly areas (~1066.42 tonne/ha/year); lower in riverside areas (~230.39 tonne/ha/year) and lowest in flooded paddy areas (~150.15tonne/ha/year). Abamectin was used as an example throughout this study to estimate pesticide loss and its effects on aquaculture. The results showed that pesticide loss by runoff and sediment loss is less than the loss by half-life degradation (for Abamectin specifically). Accumulation of Abamectin occurred at highest rate in May and October and decreased with time. The spatial models showed that pesticide residues concentrated in the river and riverside areas. In order to evaluate the acute toxicity impacts, three levels of water depth in ponds were modelled as culture depths for catfish and tiger shrimp. The results show that the highest risk areas for catfish occurred in May and October with ~333,000 and ~420,000 ha at a pond depth of 0.5 m; ~136,000 and ~183,000 ha at a pond depth of 1.0 m; and ~10,840 and ~19,000 ha at a pond depth of 1.5 m. Risk areas for catfish mainly concentrated at the riverside and in part of the coastal areas. For tiger shrimp, the risk periods during the year were similar to those found for catfish. The highest risk areas for shrimp were ~648,000 and ~771,000 ha at 0.5 m pond depth; ~346,000 and ~446,700 ha at 1.0 m pond depth; and ~185,000 and ~250,000 ha at 1.5 m pond depth. Overall, deeper ponds reduced the risk. This study has developed a method to evaluate the negative impact of input pesticides to the environment from agricultural use related to fluctuation of aquaculture risk areas. The research indicates the potential relationship between pesticide input and the risk areas for aquaculture. The model has several significant uses: 1) it can provide information to policy makers for a more harmonized development of both aquaculture and agriculture in the Mekong delta in the future, 2) it provides data for aquaculture investment analysis to decrease the hazards caused by pesticide impacts, and 3) it provides a model capable of application to wide field scenarios and suitable for any pesticide type.
36
Nguyen, Vo Chau Ngan, e Klaus Fricke. "Energy recovery from anaerobic co-digestion with pig manure and spent mushroom compost in the Mekong Delta". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-99247.
Testo completoAbstract (sommario):
This study aimed at seeking for the solution to recover the energy from agriculture waste in the Mekong Delta, Vietnam. The spent mushroom compost - a residue from the mushroom growing - was chosen for co-digestion with pig manure in anaerobic batch and semi-continuous experiments. The results showed that in case of spent mushroom compost made up 75% of the mixed substrate, the gained biogas volume was not significantly different compared to the treatment fed solely with 100% pig manure. The average produced biogas was 4.1 L×day-1 in the experimental conditions. The semi-continuous experiments remained in good operation up to the 90th day of the fermentation without any special agitating method application. The methane contents in both experiments were around 60%, which was significantly suitable for energy purposes. These results confirm that spent mushroom compost is possibly an acceptable material for energy recovery in the anaerobic fermentation processNghiên cứu này nhằm tìm kiếm giải pháp thu hồi năng lượng từ chất thải nông nghiệp tại ĐBSCL, Việt Nam. Rơm sau ủ nấm - phế phẩm sau khi trồng nấm rơm - được chọn để ủ kết hợp với phân heo trong các bộ ủ yếm khí theo mẻ và bán liên tục. Kết quả cho thấy nếu phối trộn đến 75% rơm sau ủ nấm trong nguyên liệu ủ, tổng lượng khí thu được không khác biệt đáng kể so với thí nghiệm ủ 100% phân heo. Trong điều kiện thí nghiệm, lượng khí thu được trung bình là 4.1 L.ngày-1. Thí nghiệm ủ bán liên tục vẫn vận hành tốt ở ngày thứ 90 mặc dù mẻ ủ không được khuấy đảo. Hàm lượng khí mê-tan đo được chiếm khoảng 60% hoàn toàn có thể sử dụng cho các nhu cầu về năng lượng. Những kết quả thí nghiệm khẳng định có thể sử dụng rơm sau ủ nấm để thu hồi năng lượng thông qua quá trình ủ yếm khí kết hợp
37
Tran, Thanh Be, of Western Sydney Hawkesbury University, Faculty of Agriculture and Horticulture e School of Agriculture and Rural Development. "Sustainability of rice-shrimp farming system in a brackish water area in the Mekong Delta of Vietnam". THESIS_FAH_ARD_Tran_T.xml, 1994. http://handle.uws.edu.au:8081/1959.7/421.
Testo completoAbstract (sommario):
The Mekong Delta, which is considered as the main 'rice bowl and fish basket', is one of seven distinct agro-ecological regions of Vietnam and plays an important role in the economy of the country. Several rice-based farming systems have been developed in various areas of the MD. Rice-shrimp integrated system in brackish areas is a special farming system developed in this delta. It is a profitable system and seems to be environmentally safe on the one hand without the use of pesticides. On the other hand, use of brackish water in this system may result in degradation of land, as some previous studies have found. To understand how this farming system works and to identify the external and internal factors influencing its sustainability, the project 'Sustainability of rice-shrimp farming system in a brackish area in the Mekong delta of Vietnam' was carried out in 1992-1993 by an interdisciplinary team of researchers from the University of Cantho and staff of local district Agricultural Office, representing different fields of sciences. The research methodology was the Farming Systems Research approach with modifications towards soft systems thinking, involving farmers into the research process. One main result of this study is an insight into the rice-shrimp farming system. It includes various physical, biological, technological, economical and sociological aspects of rice production prior to integration and in integrated farm, naturally supplied shrimp growing and giant shrimp rearing, upland crop production as well as off-farm and non-farm work of farm households. Sustainability of the system studied is assessed, in comparison with rice monoculture, through various criteria of the three view points productivity, environmental safety and socio-economic effectiveness. In terms of such points of view, rice-shrimp farming system is rated higher than rice monoculture system. Thus the integrated system so far is considered to be more sustainable than the others.Master of Science (Hons)
38
Tran, Thai Binh [Verfasser]. "THE KNOWLEDGE-BASED SEARCH FOR WATER-RELATED INFORMATION SYSTEM FOR THE MEKONG DELTA, VIETNAM / Thai Binh Tran". Bonn : Universitäts- und Landesbibliothek Bonn, 2014. http://d-nb.info/1049984625/34.
Testo completo
39
Vu, Ngoc Ut. "Assessment of the feasibility of stock enhancement of mud crabs, Scylla paramamosain, in the Mekong Delta, Vietnam". Thesis, Bangor University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273571.
Testo completo
40
Vu, Hoang Thai Duong [Verfasser], e F. [Akademischer Betreuer] Nestmann. "Land Use Based Flood Hazard Analysis for the Mekong Delta / Hoang Thai Duong Vu ; Betreuer: F. Nestmann". Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/1177147149/34.
Testo completo
41
Kumthorncharoen, Kittipong. "Assessing and modelling household water stress in the rural tropics : with application to the Mekong Delta communities". Thesis, University of Warwick, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.682569.
Testo completo
42
Le, Mai Xuan. "Lecturers’ Adoption and Integration of Information and Communication Technology in English Teacher Education at Two Universities in the Mekong Delta, Viet Nam". Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/14995.
Testo completoAbstract (sommario):
This qualitative comparative case study aims to investigate lecturers’ perspectives on ICT (Information and Communication Technology) mandatory use by the government in Viet Nam. The study explored the current conditions of ICT use for English teacher education at two institutions in the Mekong Delta, the lecturers’ responses to ICT and the factors that influence the adoption and implementation of ICT into their teaching. The findings helped create a framework to guide the process of ICT adoption and implementation in English teacher education in similar contexts. Forty-four lecturers of English teacher education completed the open-ended questionnaire, twenty-four of whom also contributed to semi-structured interviews. This study identified the main categories of factors influencing ICT uptake at these institutions including the lecturer factor, the institutional or organisational factor, the technological or ICT factor, and the external agencies factor. Among these, it was found the lecturers play a determinant role in ICT uptake and integration in the classroom. However, the institutional administrators also play an important role in supporting and fostering the diffusion of innovation or implementation of change within their organisation. In the context of Viet Nam and the tendency for a top-down leadership approach, the role of the administrators is very influential and critical. The study suggests that professional development for lecturers is essential to prepare them for any change or innovation diffusion. In addition, the learning community or collegiality is important in supporting lecturers to adopt and integrate ICT into teaching. The findings of this study can contribute to both practices and scholarship in the field. The findings can help administrators at the institutional level and policy-makers at the national level to have better strategies and plans for efficient ICT integration in teaching and learning. They can also contribute to the creation of a framework for ICT adoption and implementation by integrating a combination of different theories such as educational change, diffusion of innovation and self-efficacy.
43
van, Quang Pham. "Soil formation and soil moisture dynamics in agriculture fields in the Mekong Delta, Vietnam conceptual and numerical models". Licentiate thesis, KTH, Land and Water Resources Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10508.
Testo completoAbstract (sommario):
Previous studies of agricultural conditions in the Mekong Delta (MD) have identified soil compaction as an obstacle to sustainable production. A conceptual model for soil formation was presented to demonstrate the link between soil hydrology and plant response. Detailed studies of soil moisture dynamics in agricultural fields were conducted using a dynamic process-orientated model. Pressure head and water flow were simulated for three selected sites during a year for which empirical data were available. Daily meteorological data were used as dynamic input and measured pressure head was used to estimate parameter values that satisfied various acceptance criteria. The Generalised Likelihood Uncertainty Estimation (GLUE) approach was applied for calibration procedures with 10,000 runs, each run using random values within the chosen range of parameter values. To evaluate model performance and uncertainty estimation, re-sampling was carried out using coefficient of determination (R2) and mean error (ME) as the criteria. Correlations between parameters and R2 (and ME) and among parameters were also considered to analyse the relationship of the selected parameter set in response to increases/decreases in the acceptable simulations. The method was successful for two of the three sites, with many accepted simulations. For these sites, the uncertainty was reduced and it was possible to quantify the importance of the different parameters.
44
Nguyen, Thai Hoa [Verfasser]. "Monitoring of Endocrine Disruptors in Surface Waters of the Mekong Delta in Vietnam / Hoa Nguyen Thai. Landwirtschaftliche Fakultät". Bonn : Universitäts- und Landesbibliothek Bonn, 2011. http://d-nb.info/101791477X/34.
Testo completo
45
Nguyen, Thi Kim Dong. "Evaluation of agro-Industrial by-products as protein sources for duck production in the Mekong Delta of Vietnam /". SLU, Uppsala : Dept. of Animal Nutrition and Management, Swedish University of Agricultural Sciences, 2005. http://epsilon.slu.se/200581.pdf.
Testo completo
46
Dung, Nguyen Nhut Xuan. "Evaluation of green plants and by-products from the Mekong Delta with emphasis on fibre utilisation by pigs /". Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2001. http://epsilon.slu.se/avh/2001/91-576-5830-7.pdf.
Testo completo
47
Nguyen, Vo Chau Ngan [Verfasser], e Klaus [Akademischer Betreuer] Fricke. "Promotion of Biogas Plant Application in the Mekong Delta of Vietnam / Vo Chau Ngan Nguyen ; Betreuer: Klaus Fricke". Braunschweig : Technische Universität Braunschweig, 2012. http://d-nb.info/1175823910/34.
Testo completo
48
Nguyen, Trung Dung. "Economic and environmental effects of Integrated Pest Management program: A case study of Hau Giang province (Mekong Delta)". Technische Universität Dresden, 2018. https://tud.qucosa.de/id/qucosa%3A32720.
Testo completoAbstract (sommario):
Since many years, the agro-technical programs such as '3 reduction 3 increase', '1 must 5 reduction' and System of Rice Intensification (SRI) have been carried out with definite results. Recently, IPM program (integrated pest management) – a more comprehensive measure (using all possible techniques and methods to keep the pest populations below a level causing economic injury) – has been firstly piloted on a large scale in the Mekong Delta. This paper presents the main results of piloting IPM program in 2,610 hectares during 2014-2017 in Hau Giang province. As results, farmers have better economic benefit in production; the quality of rice has been gradually improved and can overcome the technical barriers of advanced countries in rice trade such as US, EU and Japan. In addition, the environmental and ecological consequences can be avoided due to
overuse of fertilizer and pesticide. Field ecosystems will be gradually restored.Từ nhiều năm nay những chương trình kỹ thuật nông nghiệp như '3 giảm 3 tăng', '1 phải 5 giảm' và hệ thống canh tác lúa cải tiến (SRI) đã được áp dụng và đã có những kết quả nhất định. Còn chương trình quản lý dịch hại tổng hợp IPM - một biện pháp tổng hợp và tích cực hơn (sử dụng tất cả các kỹ thuật và biện pháp thích hợp có thể được, nhằm duy trì mật độ của các loài gây hại dưới mức gây ra những thiệt hại kinh tế) – được thực nghiệm đầu tiên trên diện rộng ở Đồng bằng sông Cửu Long. Bài báo này trình bày những kết quả chính trong thử nghiệm ở 2.610 ha lúa trong thời gian 2014-2017 ở ở tỉnh Hậu giang. Kết quả là quản lý dịch hại ở ngưỡng cho phép, người nông dân có lợi hơn về kinh tế trong sản xuất, chất lượng gạo từng bước được cải thiện và có khả năng vượt qua các hàng rào kỹ thuật trong thương mại lúa gạo của các nước tiên tiến như USA, châu Âu, Nhật Bản. Ngoài ra tránh được hệ quả về môi trường sinh thái do sử dụng quá mức phân bón hóa học và ô nhiễm do thuốc bảo vệ thực vật và hệ sinh thái đồng ruộng dần được phục hồi.
49
Nguyen, Thi My Linh, Ky Trung Phan e Pham Dang Tri Van. "Assessing the surface water resources management for agricultural activities in the Soc Trang Province, Vietnamese Mekong Delta, Vietnam". Technische Universität Dresden, 2018. https://tud.qucosa.de/id/qucosa%3A33312.
Testo completoAbstract (sommario):
Climate change has been affecting to livelihoods of communities in the coastal plain of the Vietnamese Mekong Delta (VMD). Surface water management in the coastal plain was considered to be limited, especially in enforcement. Therefore, the research aimed to assess the stakeholder involvement, identify the conflict in using the surface water and mechanism to solve and avoid the conflict. The directive interview farmers and governmental staffs was implemented to collect the necessary data. The descriptive statistic was applied in order to analyze the collecting data through farmer survey. The questionnaire was built based on the governance assessment framework “Ten-building Block”. The results showed that the governmental group (including the people committee and the Provincial department) was the highest participatory in the management process both in decision-making level and interested level. The surface water users, especially the farmers participated with the average rate because of their low capacity in making the decision for a new policy or a new agricultural model. Besides, different groups of stakeholders as the non-governmental organization and governmental organization (the local Youth Union, Famer’s and Women’s Association) played an important role in raising the water user’s awareness. The remaining group, including nonagricultural company or traders, nearly were not concerned about the surface water changes. In addition, there were two main types of conflicts identified: between the farmers in the same kind (1) and different kind (2) of cultivation. As the consequence of the natural salinity and the impacts of output water from shrimp pond to the rice cultivation zone, the conflict was about the inefficient water regulation and distribution for each water user. These conflicts were mostly solved through self-negotiating and self-engaging between the farmers. In fact, there was no rule or principle to solve and prevent the potential water use conflict. Thus, this could be a great challenge for the surface water management in the agricultural zone as Soc Trang in the context of increasing the extreme climatic phenomenon.Biến đổi khí hậu đã và đang tác động lớn đến sinh kế của các cộng đồng ven biển đồng bằng sông Cứu Long (ĐBSCL). Công tác quản lý tổng hợp tài nguyên nước mặt tại vùng ven biển được cho rằng còn tồn tại nhiều hạn chế, nhất là trong triển khai và thực thi. Vì vậy, nghiên cứu được thực hiện tại Sóc Trăng (một tỉnh ven biển ĐBSCL) nhằm đánh giá sự tham gia của các thành phần có liên quan, xác định các mâu thuẫn trong sử dụng nguồn nước mặt cũng như các giải pháp giải quyết và phòng tránh mâu thuẫn. Phương pháp phỏng vấn trực tiếp nông hộ, tham vấn chuyên gia quản lý và thống kê mô tả được áp dụng để đánh giá các mục tiêu đặt ra của đề tài. Các thông tin khảo sát được xây dựng dựa trên bộ mười tiêu chí đánh giá quản trị tài nguyên nước (van Rijswick et al., 2014). Kết quả cho thấy nhóm chính quyền địa phương (bao gồm UBND và các Sở/Ngành) có vai trò và mức độ tham gia cao nhất trong chu trình quản lý. Người sử dụng nước mặt, nhất là nông dân đóng góp sự tham gia tương đối do mức đô ra quyết định về thiết lập chính sách và lựa chọn mô hình canh tác thấp. Mặt khác, các nhóm đối tượng khác như các tổ chức phi chính phủ, Đoàn thể, Hội nông dân và Hội phụ nữ đóng góp vai trò quan trọng trong nâng cao nhận thức và kêu gọi cộng đồng sử dụng hiệu quả nguồn nước mặt. Các nhóm tổ chức kinh tế như doanh nghiệp, tiểu thương gần như không quan tâm đến nguồn nước mặt. Bên cạnh đó, các mâu thuấn về sử dụng nước mặt cũng được xác định. Các mâu thuẫn được phân chia thành 2 nhóm: cùng loại hình canh tác và giữa các loại hình canh tác khác nhau. Các mâu thuẫn chủ yếu về vấn đề điều tiết nguồn nước không hợp lý và thiếu cân bằng trong phân phối nước ngọt cho các đơn vị canh tác do xâm nhập mặn tự nhiên, xả thải nước mặn vào vùng ngọt và khai thác không đồng đều. Các mâu thuẫn này chủ yếu được giải quyết thông qua thương lượng và thỏa thuân giữa các đối tượng có liên quan chứ chưa có bất kỳ một cơ chế hay quy định nào nhằm giải quyết cũng như phòng tránh các mâu thuẫn tiềm tàng. Vì vậy, đây sẽ là một thách thức lớn cho công tác quản lý nguồn nước mặt tại vùng sản xuất nông nghiệp thâm canh như Sóc Trăng trong bối cảnh gia tăng cực đoan khí hậu.
50
Nguyen, Le Phoung, Hong Tam Nguyen, Si Nuo Thach e Vo Chau Ngan Nguyen. "Cow raising in the Mekong Delta - The current status of waste treatment and risk of greenhouse gas emissions". Technische Universität Dresden, 2018. https://tud.qucosa.de/id/qucosa%3A33321.
Testo completoAbstract (sommario):
This study was aimed to assess the status of waste treatment for cow raising at small farm households in Can Tho, Tra Vinh, Soc Trang, and Hau Giang. The interview of 120 cow farmer households indicated that local farmers normally treat their waste by sun-drying, storing in ponds, discharging directly into rivers, or applying to anaerobic biogas. The farmers select ways to treat cow excrement according to seasons of the year: in the dry season cow waste is mostly sun-dried for sale (76.7%); stored for use (10%), untreated (7.5%) or applied to biogas plants (5.8%); however, in the rainy season most of the farmers leave the waste untreated (94.2%), except for those owning biogas tanks. Biogas treatment is applied mainly by dairy cow-raising households, accounting for 85.7% of biogas users. The cow farmer households have limited knowledge about biogas application; 23.3% of the interviewed farmers knew about biogas technology; 47.5% had little knowledge about this technology, however, 29.2% of the selected persons had no idea about biogas technology. Based on the quantity of beef cattle herds in the surveyed areas, it is estimated that CH4 gas emissions account for around 252.3 tons, 61.4 tons, 8.2 tons, and 2.5 tons in Soc Trang, Tra Vinh, Can Tho, and Hau Giang, respectively.Nghiên cứu này nhằm đánh giá hiện trạng xử lý chất thải tại các hộ chăn nuôi bò ở thành phố Cần Thơ và các tỉnh Trà Vinh, Sóc Trăng, Hậu Giang. Tổng số 120 hộ chăn nuôi đã được phỏng vấn cho thấy có 4 phương pháp xử lý chính để xử lý chất thải chăn nuôi phát sinh: ủ yếm khí (biogas), phơi khô và bán, trữ lại trong ao để sử dụng, và không xử lý. Tùy theo thời điểm trong năm người dân sẽ thay đổi cách thức xử lý chất thải chăn nuôi bò: vào mùa khô có nhiều nắng chủ yếu người dân phơi khô để bán (76,7%), để lại và sử dụng (10%), dùng để ủ biogas (5,8%), và không xử lý (7,5%); tuy nhiên vào mùa mưa hầu hết các hộ dân không xử lý chất thải chăn nuôi (94,2%), chỉ trừ những hộ dân đã có hầm ủ biogas để xử lý. Xử lý chất thải chăn nuôi bằng công nghệ biogas được áp dụng phổ biến ở các hộ nuôi bò sữa, chiếm 85,7% số hộ có hầm ủ biogas. Sự hiểu biết về công nghệ biogas của các hộ chăn nuôi còn khá giới hạn, chỉ 23,3% hộ dân được phỏng vấn biết về công nghệ biogas, 47,5% hộ biết ít về công nghệ này, trong khi 29,2% hộ dân hoàn toàn không biết. Dựa trên số lượng đàn bò thịt trong vùng khảo sát, có thể tính được lượng CH4 phát thải hàng năm từ chất thải chăn nuôi là 252,3 tấn, 61,4 tấn, 8,2 tấn và 2,5 tấn từ các địa phương Sóc Trăng, Trà Vinh, Cần Thơ, và Hậu Giang.