Dissertations / Theses on the topic 'Lao tropical forests'
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Smith, Marielle N., and Marielle N. Smith. "Responses of Tropical Forest Canopy Structure and Function to Seasonal and Interannual Variations in Climate." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/623027.
Full textReina, Rodríguez Guillermo A. "Aportaciones al conocimiento de las orquídeas del Bosque Seco Tropical y escenarios de cambio climático en Colombia." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/398962.
Full textOrchid diversity in Colombia reaches 4,270 species; new discoveries, however, suggest that an asymptote has not yet been reached. The epiphytic condition in 69% of orchid species and their location in the canopy makes it difficult to collect and register them, even more so in fragmented ecosystems such as Tropical Dry Forest. This ecosystem in Colombia occupied 9 million ha, of which at present only 720,000 ha remain. Nevertheless, this ecosystem has been insufficiently explored, and there are large geographic gaps in our knowledge of the epiphytic flora. In the last 400 years, the introduction of cattle in the Caribbean and Magdalena regions, and in the last 130 years, the cultivation of sugar cane in the Cauca Valley, have been the main causes of this transformation and accelerated the loss of plant species. In this sense, the orchids of the Tropical Dry Forest are the focus of attention of this thesis, in order to improve knowledge of their past, explore their present, and plan their future, using different methods at regional and national scales. A first line of research augmented knowledge of the orchids of the geographic Cauca Valley (694,760 ha and 2% of coverage by Tropical Dry forest) by 112% and completed a catalogue with 71 species for this bioregion of southwestern Colombia. Of the total, 9 species are endemic, one is new to science, and 38 were not known in previous studies. A second line of research used a group of seven typical epiphytic species of orchids of Tropical Dry Forest of the Cauca and Dagua river valleys to detect changes in spatial distribution and plan their conservation with respect to climate change. Modeling was carried out with MaxEnt, with the scenario SRES-A2 of climate change for the time horizon 2080-2100. The results show an altitudinal increase for the climate change scenario and an increase in suitability in mid-mountain areas, with a decrease in suitability of basal areas, where orchids are found at present. The concentration of suitable areas was greater in the Western Cordillera than in the Central Cordillera. Variables such as accessibility, type of coverage, temperature, and water availability explain 88.6% of the model. The establishment of Altitudinal Migration Corridors is proposed as an alternative for dealing with biodiversity loss in Tropical Dry forest. A final line of research identifies spatial-temporal losses of a focus group of 12 species in five bioregions of Tropical Dry Forest in Colombia. The algorithm of MaxEnt was used, with a scenario of emissions SRES 8.5 for two periods, 2030 and 2050. The results show an altitudinal displacement relative to the present, conditioned by variables such as temperature, accessibility, and precipitation. Mid-mountain areas will increase their suitability, and lowlands will decrease in suitability. The thresholds for pollinators (Euglossini), availability of tree hosts, and distances to coverage of Tropical Dry Forest and protected areas suggest that connectivity between lowlands and mid-mountain zones should be improved. Sixty-nine climatic niches are presented for Colombia as a conservation strategy for adapting to climate change.
Attah, Alhassan. "A model for forest and product certification in Ghana : the perception and attitudes of forest enterprises in Ghana." Thesis, Bucks New University, 2011. http://bucks.collections.crest.ac.uk/10085/.
Full textChaparro, Mendivelso Hooz Angela. "Impacts of climate and drought on tree radial growth in Neotropical dry forests: Scaling up from short to long time-scales = Impactos del clima y las sequías en el crecimiento radial de los árboles en los bosques secos Neotropicales: Evaluación de sus efectos a diferentes escalas temporales." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/402722.
Full textEsta tesis evaluó la dinámica del crecimiento radial a diferentes escalas temporales y determinó su relación con el clima y la sequía en dos bosques secos tropicales de Colombia (Tuluá) y Bolivia (INPA). A escalas intra-anuales se encontró que: (i) la reactivación del cambium y el crecimiento del xilema ocurre durante la época húmeda del año en ambos bosques. Esto refleja la influencia de las altas precipitaciones y los valores positivos del balance hídrico atmosférico en el desarrollo de las nuevas células del xilema. (ii) El período de crecimiento en Tuluá estuvo asociado a temperaturas bajas y, por ende, a un déficit de presión del vapor (DPV) bajo, mientras que en INPA la estación de crecimiento estuvo asociada a valores altos de temperatura y DPV. Sin embargo, en ambos sitios de estudio, las temperaturas altas registradas a lo largo del día afectaron negativamente el incremento radial a escalas horarias. Las especies pueden hacer frente a estas condiciones adversas, por ejemplo, restringiendo el crecimiento a períodos del día que registren temperaturas bajas, ya que la pérdida de agua asociada a la evapotranspiración también sería baja. A escalas inter-anuales se determinó que: (i) el crecimiento radial de todas las especies de INPA presentó una asociación positiva con la precipitación y el balance hídrico atmosférico y una relación negativa con la temperatura. Esto indica que todas las especies comparten una señal común de la variabilidad del crecimiento en respuesta al clima local. No obstante, la fuerza de la respuesta fue especie-específica. Esto indica que existe una sensibilidad diferencial entre las especies al clima. (ii) El crecimiento radial de todas las especies de INPA respondió positivamente al balance hídrico atmosférico durante la estación húmeda, pero esa respuesta fue diferente entre las especies en función de la densidad de la albura. La densidad de la albura fue negativamente relacionada a la variabilidad del crecimiento explicada por el balance hídrico. (iv) Las especies de INPA fueron resilientes a las sequías de corto plazo (estación seca anual), mientras que el crecimiento fue particularmente sensible a las sequías de larga duración (sequías multi-anuales), excepto en las especies con alta densidad de la albura.
Lan, Chih-Ching Verfasser], and Michael G. [Akademischer Betreuer] [Faure. "A Law and Economics Analysis of Policy Instruments to Prevent Deforestation and Forest Degradation in the Tropics / Chih-Ching Lan ; Betreuer: Michael Faure." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2019. http://nbn-resolving.de/urn:nbn:de:gbv:18-98063.
Full textLan, Chih-Ching [Verfasser], and Michael [Akademischer Betreuer] Faure. "A Law and Economics Analysis of Policy Instruments to Prevent Deforestation and Forest Degradation in the Tropics / Chih-Ching Lan ; Betreuer: Michael Faure." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2019. http://d-nb.info/118931973X/34.
Full textDellaux, Julien. "Le mécanisme visant la conservation des forêts tropicales de la convention-cadre sur les changements climatiques (REDD+) : illustration de l'adaptativité du droit international." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0426.
Full textHow International law can regulate complex phenomenon? This question appears particularly relevant if we consider tropical deforestation. Technical issues and the opposite interests of States, stemming from interlinked services provided by forest, had prevented International community to adopt a convention on forests. Nevertheless, climate regime has recently created a so-called mechanism on « reducing emissions from deforestation and forest degradation in developing countries and the role of conservation and sustainable management of forests and enhancement of forest carbon stocks in developing countries » (REDD+). The normative framework laid down in decisions of the Conference of the parties has stimulated control improvement on forest resources and wide-ranging reform in developing countries. The study will evaluate the specificities of this normative system by going further its apparent normative weakness. It will expose how International law manage to regulate complex phenomenon by producing adaptive legal system. The study will demonstrate that the specific feature of this system lies in its ability to conciliate two opposite needs: flexibility and legal security
Phompila, Chittana. "Mapping and monitoring forest cover changes in Lao PDR using remote sensing." Thesis, 2016. http://hdl.handle.net/2440/106300.
Full textThesis (Ph.D.) (Research by Publication) -- University of Adelaide, School of Biological Sciences, 2016.
McGinty, Meghan Micheline. "Native forest tree conservation in tropical agroforests: Case study of cacao farms in the Atlantic Forest of southern Bahia, Brazil." Thesis, 2011. https://doi.org/10.7916/D8862PD0.
Full textUnger, Malte Arne. "Relationships between soil chemical properties and forest structure, productivity and floristic diversity along an altitudinal transect of moist tropical forest in Amazonia, Ecuador." Doctoral thesis, 2010. http://hdl.handle.net/11858/00-1735-0000-0006-ADA3-B.
Full textKrahn, Jutta [Verfasser]. "The dynamics of dietary change of transitional food systems in tropical forest areas of Southeast Asia : the contemporary and traditional food system of the Katu in the Sekong province, Lao PDR / von Jutta Krahn." 2005. http://d-nb.info/978977742/34.
Full textFimpa, Tuwizana Twison. "Opportunités du REDD+ pour l'aménagement durable des forêts tropicales et obstacles à son implantation en République démocratique du Congo : perspective juridique." Thèse, 2013. http://hdl.handle.net/1866/12716.
Full textThe situation of the rainforest in developing countries in general and the Democratic Republic of Congo (DRC) in particular is worrying. Emissions of carbon dioxide from deforestation are about 1.6 GtCO2e/an, or 17% of global emissions of "greenhouse gases". Under the auspices of the UN Framework Convention on Climate Change, REDD+ has been established to fight against the deforestation and degradation of forests. This study examines the different opportunities offered by the program for ecosystem-based management of forest cover in the DRC and contextual barriers to its implementation. For the DRC, REDD+ has a number of opportunities: reducing emissions from deforestation and forest degradation; work begins afforestation and reforestation for sustainable management of resources leading to job creation and promoting the growth of GDP and exports, increased yield and maintaining greater food needs. The REDD+ can promote the growth of the agricultural gross domestic product. It can contribute to the electrification of households and halve spending dependent on mining and oil and thus generate thousands of jobs in infrastructure. For local and indigenous communities, it can also help to protect and promote the cultures associated with the forest. But, faced with the burdens of legal, political, social, economic, technological and cultural characteristics of the country, these opportunities may be diminished, if not annihilated. Given that most of the deployment of the REDD+ will happen in Congolese rural areas, the major obstacle is the customary law. The solution would be to harmonize the requirements and objectives of REDD+ not only with the Forest Code of 2002 and its implementing rules but also with the customary law which local and indigenous communities identify.
Moser, Gerald. "Elevation Effects on Key Processes of Carbon Cycling in South Ecuadorian Mountain Forests." Doctoral thesis, 2008. http://hdl.handle.net/11858/00-1735-0000-0006-AD1B-1.
Full textMwavu, Edward Nector. "Human impact, plant communities, diversity and regeneration in Budongo Forest Reserve, Northwestern Uganda." Thesis, 2008. http://hdl.handle.net/10539/4863.
Full textFimpa, Tuwizana Twison. "Perspectives juridiques quant à l'implantation du programme REDD+ dans les pays en développement: développement durable et participation locale." Thèse, 2017. http://hdl.handle.net/1866/19980.
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