Rozprawy doktorskie na temat „Canopy cover”
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Noble, Sidney Lake. "The Influence of Canopy Cover and Canopy Heterogeneity on Plant Diversity within Oak Savannas". Miami University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=miami1595843486558554.
Pełny tekst źródłaCuello, Nerea. "NEW CONCEPT OF A STROLLER CANOPY". Thesis, Tekniska Högskolan, Jönköping University, JTH, Industridesign, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-49442.
Pełny tekst źródłaMalnou, Cathy. "A canopy approach to nitrogen recommendation for the sugar beet crop". Thesis, University of Nottingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288992.
Pełny tekst źródłaBrinez, Carolina. "Dynamics of canopy cover in a wet forest in Costa Rica". FIU Digital Commons, 2005. http://digitalcommons.fiu.edu/etd/1884.
Pełny tekst źródłaBerdie, Ian Joseph. "Assessing Canopy Cover Requirements of Storm's Stork (Ciconia stormi) at Multiple Scales". Scholarly Repository, 2008. http://scholarlyrepository.miami.edu/oa_theses/132.
Pełny tekst źródłaGoff, Bruce Franklin. "Dynamics of canopy structure and soil surface cover in a semiarid grassland". Thesis, The University of Arizona, 1985. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_1985_503_sip1_w.pdf&type=application/pdf.
Pełny tekst źródłaKang, Katherina A. "Soil Carbon Accumulation in an Urban Ecosystem: Canopy Cover and Management Effects". Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1703418/.
Pełny tekst źródłaKimball, Pulelehua L. "Urban Tree Canopy Assessments in the Chesapeake Bay Watershed". Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/48057.
Pełny tekst źródłaMaster of Science
Gaulton, Rachel. "Remote sensing for continuous cover forestry : quantifying spatial structure and canopy gap distribution". Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/3419.
Pełny tekst źródłaDonaldson, Jason. "Do trees suppress grass fuel loads? : canopy cover effects in South African savannas". Bachelor's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/26376.
Pełny tekst źródłaLee, Alex C., i alexanderlee@aapt net au. "Utilising airborne scanning laser (LiDAR) to improve the assessment of Australian native forest structure". The Australian National University. Fenner School of Environment and Society, 2008. http://thesis.anu.edu.au./public/adt-ANU20090127.222600.
Pełny tekst źródłaGriffin, Alicia Marie Rutledge. "Using LiDAR and normalized difference vegetation index to remotely determine LAI and percent canopy cover at varying scales". [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1117.
Pełny tekst źródłaPavuluri, Kiran. "Winter Barley as a Commodity Cover Crop in the Mid-Atlantic Coastal Plain and Evaluation of Soft Red Winter Wheat Nitrogen Use Efficiency by Genotype, and its Prediction of Nitrogen Use Efficiency through Canopy Spectral Reflectance in the Eastern US". Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/47103.
Pełny tekst źródłaPh. D.
Gerner, Eden. "The Effects of Impervious Surface Area, Tree Canopy Cover, and Floral Richness on Bee Abundance, Richness, and Diversity Across an Urban Landscape". Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/41213.
Pełny tekst źródłaMcClelland, Rebecca Elizabeth Mooneyhan. "Ground Layer Response to Disturbance in the Pine-Dominated Eastern Foothill Region of West-Central Alberta, Canada". OpenSIUC, 2011. https://opensiuc.lib.siu.edu/dissertations/436.
Pełny tekst źródłaRoundy, Darrell B. "Estimating Pinyon and Juniper Cover Across Utah Using NAIP Imagery". BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5575.
Pełny tekst źródłaBopp, Jesse A. "Combined effects of water chemistry, canopy cover, and stream size on benthic macroinvertebrates along a central Appalachian stream continuum". Morgantown, W. Va. : [West Virginia University Libraries], 2002. http://etd.wvu.edu/templates/showETD.cfm?recnum=2474.
Pełny tekst źródłaTitle from document title page. Document formatted into pages; contains viii, 96 p. : ill., maps (some col.). Includes abstract. Includes bibliographical references (p. 41-51).
Almeida, Julio Augusto Pires 1958. "Use of infrared thermometry to measure canopy-air temperature difference at partial cover to assess crop water stress index". Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/191890.
Pełny tekst źródłaRamsey, Jeff. "Tree Canopy Cover and Potential in Portland, OR: A Spatial Analysis of the Urban Forest and Capacity for Growth". PDXScholar, 2019. https://pdxscholar.library.pdx.edu/open_access_etds/5110.
Pełny tekst źródłaRitchie, Glen L. "Use of Ground-Based Canopy Reflectance to Determine Radiation Capture, Nitrogen and Water Status, and Final Yield in Wheat". DigitalCommons@USU, 2003. https://digitalcommons.usu.edu/etd/5632.
Pełny tekst źródłaPlenzler, Michael A. "Terrestrial Influences on the Macroinvertebrate Biodiversity of Temporary Wetlands". Bowling Green State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1355081524.
Pełny tekst źródłaCadaret, Erik M. "Vegetation Canopy Cover Effects on Sediment and Salinity Loading in the Upper Colorado River Basin Mancos Shale Formation, Price, Utah". Thesis, University of Nevada, Reno, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10001481.
Pełny tekst źródłaWith future climate change and increased water demand and scarcity in the Colorado River Basin, the Bureau of Reclamation estimates that the costs of salinity damage will increase for Colorado River users and will exacerbate the current salinity challenges. This study focuses on saline and sodic soils associated with the Mancos Shale formation in order to investigate the mechanisms driving sediment and salinity loads in the Price-San Rafael River Basin of the upper Colorado River. A Walnut Gulch rainfall simulator was operated with a variety of slope angles and rainfall intensities at two field sites (Price, Dry-X) near Price, Utah in order to evaluate how the amount and spatial distribution of vegetation affects salinity in runoff. For each simulated rainfall event, the time-varying concentrations of major cations, anions, and sediment in runoff were measured. Principal component analysis revealed that the two field sites are generally different in runoff water chemistry and soil chemistry, likely due to the difference in parent material and soil indicative of their location on different geologic members. The Dry-X site also has substantially greater total dissolved solids (TDS) and sediment in runoff, soil sodium absorption ratio (SAR), and soil cation exchange capacity (CEC) than the Price site. Despite these differences, a consistent positive linear relationship between the plot-averaged sediment and TDS concentration was found across both sites. The Rangeland Hydrology Erosion Model (RHEM) was calibrated to provide unbiased estimates of sediment in runoff from 23 runs of the rainfall simulator. RHEM simulated the plot-plot variability best at Dry-X compared to Price. Sensitivity analysis of the RHEM input parameters showed that the splash and sheet erodibility coefficient (Kss) and the effective saturated conductivity coefficient (Ke) had the largest influence on the model’s sediment and discharge outputs, respectively. The regression that predicted TDS concentration from sediment was applied to RHEM outputs to show that the model could be used to provide salinity estimates for different storm intensities on this part of the Mancos Shale. The potential influence of vegetation canopy cover on sediment production from these two sites was inferred by running RHEM with canopy cover values ranging from 0% to 100%. This changed sediment output by 111% to -91% relative to the present vegetation cover. Measures of the geometry of soil and vegetation patches at Dry-X, such as fractal dimension index and proximity index, showed a relationship to error residuals from RHEM. As the vegetation becomes less isolated, more uniform, and the tortuosity of the bare soil area increases, observed sediment decreases relative to RHEM predictions. The results of this study will help land management agencies assess the feasibility of mitigation strategies for reducing sediment and salinity loads from the saline and sodic soils of the Mancos Shale formation and indicate a possible benefit to incorporating the parameters that describe the spatial pattern of vegetation in RHEM.
Cronje, Arina. "Effect of canopy position on fruit quality and consumer preference for the appearance and taste of pears". Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86367.
Pełny tekst źródłaENGLISH ABSTRACT: We aimed to determine how canopy position influences fruit quality and consumer preference for the eating quality and appearance of ‘Forelle’, ‘Bon Chrétien’ and ‘Bon Rouge’ pears. Our hypothesis was that consumer preference would be higher for the appearance and eating quality of outer canopy fruit. Our first trial investigated the effect of canopy position and cold storage duration on quality attributes and consumer preference for ‘Forelle’ pears. Mealiness was much more prevalent in outer canopy fruit in 2012 and after 9 and 12 weeks cold storage in 2011. In 2011, consumers preferred the eating quality of inner canopy pears that had been subjected to 12 and 16 weeks of cold storage while inner canopy pears were generally preferred in 2012. This study provides support for the mandatory 12 weeks cold storage of ‘Forelle’ pears. Our second trial investigated the effect of canopy position and harvest maturity within the commercial picking window on the quality attributes and consumer preferences for ‘Forelle’ pears. Inner canopy pears of harvest 1 (23 February) and harvest 2 (27 February) were significantly preferred in terms of eating quality. The general dislike for harvest 3 (13 March) pears and outer canopy fruit seemed to relate to an incidence of mealiness. Our results suggest that harvesting ‘Forelle’ pears at a firmness ≈6.2 kg will ensure that both inner and outer canopy pears have acceptable eating quality. In our third trial, fruit were harvested at commercial firmness from two orchards in each of Elgin and Ceres to assess the effect of orchard site on quality attributes of ‘Forelle’ pears. Total soluble solids (TSS) were higher in Elgin while flavour attributes were more pronounced in Ceres. In both areas, outer canopy pears were higher in TSS and lower in titratable acidity (TA) but canopy position had no effect on sweet and sour taste. Mealiness incidence was high in outer canopy fruit from Elgin, as well as in one Ceres orchard. Further research over consecutive seasons is needed to determine the reasons for orchard differences in mealiness incidence. Our fourth trial investigated the effect of canopy position on quality attributes and consumer preference for ‘Bon Chrétien’ and ‘Bon Rouge’ pears. Despite a higher TSS:TA ratio in outer canopy ‘Bon Rouge’ pears and a higher TSS and dry matter concentration in outer canopy ‘Bon Chrétien’ pears, canopy position did not affect sensory eating quality attributes. Seen overall, results indicate that canopy position has a minor effect on consumer preference for ‘Bon Chrétien’ and ‘Bon Rouge’ eating quality. No significant differences in colour and consumer preference for appearance were found between outer and inner canopy ‘Bon Chrétien’ pears. Consumers slightly preferred the redder outer canopy ‘Bon Rouge’ pears over the less red inner canopy fruit. Although consumers preferred the red blush colour of outer canopy ‘Forelle’ pears, inner canopy pears also received high scores. Inner canopy ‘Forelle’ pears should not be viewed as inferior to outer canopy fruit with regard to both eating quality and appearance.
AFRIKAANSE OPSOMMING: Ons het gepoog om die effek van boomposisie op vrugkwaliteit en verbruikersvoorkeur vir die eetkwaliteit en voorkoms van ‘Forelle’, ‘Bon Chrétien’ en ‘Bon Rouge’ pere te ondersoek. Ons hipotese was dat verbruikersvoorkeur hoër sou wees vir die voorkoms en eetkwaliteit van pere van die buitekant van die boom se blaredak. Ons eerste proef se doelstelling was om die effek van boomposisie en koelopberging op die kwaliteitseienskappe en verbruikersvoorkeur vir ‘Forelle’ pere te bepaal. Melerigheid was beduidend meer aanwesig in buitevrugte in 2012 asook na 9 en 12 weke koelopberging in 2011. Verbruikersvoorkeur vir eetkwaliteit was die hoogste vir binnevrugte na 12 en 16 weke koelopberging in 2011 terwyl binnevrugte in die algemeen voorkeur geniet het in 2012. Hierdie studie steun die bevindinge van vorige studies dat ‘Forelle’ pere vir ten minste 12 weke koelopgeberg moet word. Die doel van ons tweede proef was om te bepaal of ‘Forelle’ pere wat by verskillende ryphede binne die kommersiële oesperiode geoes is, verskille toon in kwaliteitseienskappe en of hierdie verskille, indien enige, verband hou met verbruikersvoorkeur vir eetkwaliteit. Die eetkwaliteit van binnevrugte van oes 1 (23 Februarie) en oes 2 (27 Februarie) is verkies bo buitevrugte. Die algemene afkeur vir oes 3 (13 Maart) en buitevrugte kan moontlik toegeskryf word aan die hoë voorkoms van melerigheid. Ons resultate dui aan dat beide binne- en buitevrugte aanvaarbare eetkwaliteit behoort te hê indien ‘Forelle’ pere by ‘n fermheid van ≈6.2 kg geoes word. Vir ons derde proef is ‘Forelle’ pere geoes by kommersiële fermheid (≈6.4 kg) vanaf twee boorde in elk van Elgin en Ceres. Totale opgeloste vastestowwe (TOV) was hoër in Elgin pere terwyl geur-eienskappe meer prominent was in Ceres pere. In beide areas het buitevrugte hoër TSS en laer titreerbare sure (TS) gehad, maar boomposisie het egter geen effek op soet en suur smaak gehad nie. Die voorkoms van melerigheid was hoog in buitevrugte van die Elgin boorde, sowel as in een van die Ceres boorde. Verdere navorsing oor opeenvolgende seisoene word benodig om redes vir die verskille in die voorkoms van melerigheid tussen boorde te ondersoek. Die doelstelling van ons vierde proef was om die effek van boomposisie op die kwaliteitseienskappe en verbruikersvoorkeur vir ‘Bon Chrétien’ en ‘Bon Rouge’ pere te ondersoek. Ondanks ‘n hoër TOV:TS ratio in ‘Bon Rouge’ buitevrugte en ‘n hoër TOV en droë massa konsentrasie in ‘Bon Chrétien’ buitevrugte, het boomposisie ‘n minimale impak gehad op sensoriese eetkwaliteitseinskappe en verbruikervoorkeur vir die pere. Boomposisie het geen effek op die kleur en verbruikersvoorkeur vir die voorkoms van ‘Bon Chrétien’ pere gehad nie. Verbruikers het ‘n effense hoër voorkeur getoon vir die rooier ‘Bon Rouge’ buitevrugte. Alhoewel verbruikers die aantreklike rooi bloskleur van ‘Forelle’ buitevrugte verkies het, het die groen tot geel binnevrugte ook hoë voorkeurpunte behaal. Rakende voorkoms en eetkwaliteit, is ‘Forelle’ binnevrugte glad nie minderwaardig teenoor buitevrugte nie.
Sen, Susmita. "Characterizing Impacts of and Recovery from Surface Coal Mining in Appalachian Forested Landscapes Using Landsat Imagery". Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/38737.
Pełny tekst źródłaPh. D.
Horcher, Andy. "Improving Helicopter Yarding with Onboard GPS". Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/26678.
Pełny tekst źródłaPh. D.
Mobe, Nompumelelo Thelma. "The influence of canopy cover and cultivar on rates of water use in apple orchards in the Western Cape Province, South Africa". University of the Western Cape, 2020. http://hdl.handle.net/11394/8156.
Pełny tekst źródłaWater availability and climate related issues are some of the greatest crop production risks to irrigated agriculture in arid regions. In South Africa, for example, the increasing frequency and severity of droughts related to climate change and the growing competition for limited water resources among different users threaten the sustainability and growth of irrigated agriculture, especially the water-intensive fruit industry. Major fruit such as apples (Malus domestica Borkh) are produced entirely under irrigation in South Africa. As a result, there has been considerable research to accurately quantify the water requirements of fruit tree orchards in order to maximize water productivity.
Cai, Bill Yang. "Applications of deep learning and computer vision in large scale quantification of tree canopy cover and real-time estimation of street parking". Thesis, Massachusetts Institute of Technology, 2018. https://hdl.handle.net/1721.1/122317.
Pełny tekst źródłaCataloged from PDF version of thesis.
Includes bibliographical references (pages 73-77).
A modern city generates a large volume of digital information, especially in the form of unstructured image and video data. Recent advancements in deep learning techniques have enabled effective learning and estimation of high-level attributes and meaningful features from large digital datasets of images and videos. In my thesis, I explore the potential of applying deep learning to image and video data to quantify urban tree cover and street parking utilization. Large-scale and accurate quantification of urban tree cover is important towards informing government agencies in their public greenery efforts, and useful for modelling and analyzing city ecology and urban heat island effects. We apply state-of-the-art deep learning models, and compare their performance to a previously established benchmark of an unsupervised method.
Our training procedure for deep learning models is novel; we utilize the abundance of openly available and similarly labelled street-level image datasets to pre-train our model. We then perform additional training on a small training dataset consisting of GSV images. We also employ a recently developed method called gradient-weighted class activation map (Grad-CAM) to interpret the features learned by the end-to-end model. The results demonstrate that deep learning models are highly accurate, can be interpretable, and can also be efficient in terms of data-labelling effort and computational resources. Accurate parking quantification would inform developers and municipalities in space allocation and design, while real-time measurements would provide drivers and parking enforcement with information that saves time and resources. We propose an accurate and real-time video system for future Internet of Things (IoT) and smart cities applications.
Using recent developments in deep convolutional neural networks (DCNNs) and a novel intelligent vehicle tracking filter, the proposed system combines information across multiple image frames in a video sequence to remove noise introduced by occlusions and detection failures. We demonstrate that the proposed system achieves higher accuracy than pure image-based instance segmentation, and is comparable in performance to industry benchmark systems that utilize more expensive sensors such as radar. Furthermore, the proposed system can be easily configured for deployment in different parking scenarios, and can provide spatial information beyond traditional binary occupancy statistics.
by Bill Yang Cai.
S.M.
S.M. Massachusetts Institute of Technology, Computation for Design and Optimization Program
Chen, Yi-Huei. "Effects of altitude and canopy cover on the nest size and colony size of the red wood ants Formica lugubris and Formica paralugubris". Thesis, University of York, 2015. http://etheses.whiterose.ac.uk/8476/.
Pełny tekst źródłaVeatch, William Curtis. "Quantifying the Effects of Forest Canopy Cover on Net Snow Accumulation at a Continental, Mid-Latitude Site, Valles Caldera National Preserve, NM, USA". Thesis, The University of Arizona, 2008. http://hdl.handle.net/10150/193352.
Pełny tekst źródłaOlsson, Cecilia. "Amphibian and reptile distribution in forests adjacent to watercourses". Thesis, Karlstad University, Faculty of Social and Life Sciences, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-3301.
Pełny tekst źródłaWorldwide amphibians and reptiles are declining with habitat fragmentation and destruction as the primary cause. Riparian areas are important for the herpetofauna, but as land is converted to agriculture or harvested for timber the areas are diminishing. The aim of this study was to examine amphibian and reptile abundance in relation to distance from water and in relation to habitat characteristics, foremost per cent deciduous trees. The survey was conducted during spring at six different locations, with continuous forest along streams or rivers, outside of Karlstad, Sweden. Animals were searched along four lines parallel to the water and each study area was visited five times. Statistical analyses were made for grass snake (Natrix natrix), common lizard (Lacerta vivipara) and frogs with joined data of common frog (Rana temporaria) and moor frog (R. arvalis). As expected both reptiles were positively correlated with per cent deciduous trees, with the strongest significance for the common lizard. For grass snake there was also a difference between survey periods, which might reflect the importance of weather. Frogs revealed no trends to trees, but there was a significant difference for habitat characteristics like amount woody debris and per cent bare ground. None of the species were correlated with distance from water which was surprising, especially for the frogs which is more dependent on water than the reptiles. Grass snakes hunt in the water, but the common lizard has no such associations to the water, yet the latter did reveal a slight trend towards being more numerous closer to the water. The causes behind lacking correlation to distance from water may be many, but water characteristics seem very important. Many amphibians prefer warm and calm ponds over running water that in general are colder and likely to inhabit more predators. It was assumed that the amphibians breed in the streams or rivers, but it is possible that other water bodies may have served as breeding sites, which mean the starting point was incorrect.
Kamboyi, Chipango. "COMPARING THE COMPOSITION OF SAPROXYLIC BEETLE FAUNA ON OLD HOLLOW OAKS BETWEEN TWO TIME PERIODS". Thesis, Linköpings universitet, Biologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-162441.
Pełny tekst źródłaKhokthong, Watit [Verfasser], Dirk [Akademischer Betreuer] Hölscher, Dirk [Gutachter] Hölscher, Holger [Gutachter] Kreft i Christian [Gutachter] Ammer. "Drone-based assessments of crowns, canopy cover and land use types in and around an oil palm agroforestry experiment / Watit Khokthong ; Gutachter: Dirk Hoelscher, Holger Kreft, Christian Ammer ; Betreuer: Dirk Hoelscher". Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2019. http://d-nb.info/1183374763/34.
Pełny tekst źródłaKhokthong, Watit Verfasser], Dirk [Akademischer Betreuer] [Hölscher, Dirk [Gutachter] Hölscher, Holger [Gutachter] Kreft i Christian [Gutachter] Ammer. "Drone-based assessments of crowns, canopy cover and land use types in and around an oil palm agroforestry experiment / Watit Khokthong ; Gutachter: Dirk Hoelscher, Holger Kreft, Christian Ammer ; Betreuer: Dirk Hoelscher". Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2019. http://d-nb.info/1183374763/34.
Pełny tekst źródłaGuo, Fen. "The Influence of Light and Nutrients on Stream Food Webs". Thesis, Griffith University, 2016. http://hdl.handle.net/10072/366591.
Pełny tekst źródłaThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
Full Text
Martell, Linn. "Ljusklimatet i skogsvattendrag : Skillnader i förhållande till skogens ålder". Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-81476.
Pełny tekst źródłaDue to intensive forestry, the general stand structure in Swedish forests has changed, which in turn has affected light availability in forest streams. The transformation from old growth to younger productive forests in the riparian zone has led to a structural shift towards a higher density and single-leveled canopies that limits light penetration. Light is a fundamental factor promoting many ecological processes in forest streams, which makes it an important feature to examine in a sustainable forestry context. This study investigated the light climate in forest streams, with the purpose to look for differences in relation to forest age. The study was conducted in August 2020 in Stockholm County, and consisted of five streams in middle stage forests (40 – 80 years) and five in old growth forests (>140 years). Canopy closure was estimated using hemispherical photos taken with a fish-eye lens at eight sample points within each site and analyzed with a mobile app (GLAMA). An inventory of trees in the riparian zone was carried out according to the point-centered quarter method, and the data were used to measure tree density, species richness and absolute density of each observed species. The results showed small non-significant differences in canopy closure between age categories, with a higher mean percentage in old growth forests. Both middle stage and old growth forests were dominated by spruce, and the species richness was the same regardless of age category. The tree density differed slightly between categories, with a tendency for a higher mean density in old growth forests. Further research is needed to reduce uncertainty and expand on the effects of forestry if we are to sustain the aquatic and terrestrial environments in forest ecosystems.
Salazar, Ana. "Seed Dynamics and Seedling Establishment of Woody Species in the Tropical Savannas of Central Brazil (Cerrado)". Scholarly Repository, 2010. http://scholarlyrepository.miami.edu/oa_dissertations/371.
Pełny tekst źródłaPurrenhage, Jennifer Lyn. "Importance of Habitat Structure for Pond-Breeding Amphibians in Multiple Life Stages". Miami University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=miami1240957514.
Pełny tekst źródłaRiley, Christopher B. "Quantifying the Ecosystem Services and Functions of Forests across Diverse Urban Landscapes". The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1574414361328737.
Pełny tekst źródłaHurskainen, S. (Sonja). "The roles of individual demographic history and environmental conditions in the performance and conservation of northern orchids". Doctoral thesis, Oulun yliopisto, 2018. http://urn.fi/urn:isbn:9789526220888.
Pełny tekst źródłaTiivistelmä Populaation kasvunopeus riippuu siitä, kuinka monta yksilöä populaatioon syntyy ja kuinka monta yksilöä kuolee. Yksilöiden lisääntyvyyteen ja elossa säilyvyyteen puolestaan vaikuttavat monet ulkoiset ja sisäiset tekijät, kuten sää ja yksilön oma lisääntymishistoria. Kasvilla on rajallinen määrä resursseja, joten sen pitää tehdä kompromisseja eri elintoimintojen, esimerkiksi kasvun ja lisääntymisen, välillä. Klonaaliset kasvit voivat myös lisääntyä usealla tavalla: joko suvullisesti siemenistä tai kasvullisesti tuottamalla uusia versoja. Demografisten prosessien tutkimisessa pitkäaikaiset seuranta-aineistot ovat välttämättömiä. Pitkäaikaisseurannat voivat myös paljastaa uhanalaisen lajin populaation taantumisen syyt ja näistä seurannoista saatua tietoa voidaan soveltaa harvinaisten lajien, esimerkiksi kämmeköiden, suojelutoimien suunnittelussa. Tässä väitöskirjassa analysoin aineistoa kämmeköiden pitkäaikaisseurannoista Suomesta ja Virosta. Tavoitteenani oli arvioida ulkoisten ja sisäisten tekijöiden merkitystä pitkäikäisten kasvien menestykselle. Tulokset osoittavat, että kasvin menestys riippuu sekä yksilön omasta demografisesta historiasta että sen ympäristöstä. Eri säätekijöiden vaikutus tikankontin (Cypripedium calceolus) kasvuun ja kukkimiseen vaihteli Suomen ja Viron välillä, mutta lumen syvyys ja edellisen kasvukauden lämpötila nousivat merkittävimmiksi tekijöiksi molemmissa maissa. Tikankontin kasvu ja kukinta riippuivat kuitenkin säätä enemmän kasvin omasta demografisesta historiasta. Runsas lisääntyminen edeltävällä kasvukaudella vähensi lisääntymistä tulevalla kasvukaudella, mikä johti kaksivuotiseen jaksottaisuuteen tikankontin lisääntymisessä ja kasvussa. Tutkiessani dormanssia (lepotila, jossa kasvi ei tuota maanpäällistä versoa) kolmella kämmekkälajilla, tikankontilla, neidonkengällä (Calypso bulbosa) ja tummaneidonvaipalla (Epipactis atrorubens), havaitsin lisäksi, että todennäköisyys siirtyä dormanssiin riippui kasvin koosta. Myöskin tämän lepotilan aiheuttamat kustannukset olivat riippuvaisia kasvin aikaisemmasta tilasta. Isoilla kasveilla dormanssilla oli sekä suoria kustannuksia että kustannuksia suhteessa versomiseen. Pienillä kasveilla näitä kustannuksia ei ollut. Osoitan väitöskirjassani myös, että maltillisella puunpoistolla voidaan lisätä tikankonttipopulaatioiden siementuottoa ja versotiheyttä
Klinka, Karel. "Natural regeneration on clearcuts at the lower limit of the mountain hemlock zone". Forest Sciences Department, University of British Columbia, 1997. http://hdl.handle.net/2429/654.
Pełny tekst źródłaYamada, Thiago. "Técnicas de processamento digital de imagens para análise de integridade do dossel - um modelo em mata semidecídua". Universidade Federal de São Carlos, 2014. https://repositorio.ufscar.br/handle/ufscar/1824.
Pełny tekst źródłaFinanciadora de Estudos e Projetos
The forests management and conservation are recently subjects discussed throughout the world, because they are directly correlation with the maintenance of environmental functions and services provided by natural environments. With growth of urban centers and extensive agriculture the natural areas have suffered and are suffering a big pressure making arise degraded areas constantly that encourage the recuperation movement in those areas. Moreover, the selective cut and the formation natural or artificial clearings make discontinuities in the canopy, irregularities reflected in the structure and profile. However, to realize the restoration and management, for example, a forest, first must to know your conservation state. This thesis intend to map more and less conserved areas through the analysis of structure and integrity in the canopy, realized with: canopy cover images, canopy closure images, vertical profile sketch, panchromatic image HRC of satellite CBERS-2B, and techniques digital image processing, beyond field survey. With intention to create a model able to identify, map, and monitor the forest degraded.
A conservação e manejo das florestas são temas muito atuais e discutidos em todo mundo, devido ao fato de estarem diretamente correlacionados com a manutenção das funções e serviços ambientais prestados pelos ambientes naturais. Com o crescimento dos centros urbanos e da agricultura extensiva, as áreas naturais sofreram e estão sofrendo uma grande pressão fazendo com que surjam constantemente áreas degradadas que acabam impulsionando o movimento de recuperação dessas áreas. Além disso, o corte seletivo e a formação de clareiras naturais ou artificiais produzem descontinuidades no dossel, refletindo em irregularidades na estrutura e no perfil. No entanto, para se realizar a recuperação e manejo, por exemplo, de uma floresta, deve-se primeiro conhecer seu estado de conservação. Esta tese pretende mapear áreas mais e menos conservadas, através da análise da estrutura e integridade do dossel, realizada com: imagens da cobertura do dossel, imagens da oclusão do dossel, desenho do perfil vertical, imagem pancromática HRC do satélite CBERS-2B e técnicas de processamento digital de imagens, além de levantamentos de campo. Com o intuito de criar um modelo capaz de identificar, mapear e monitorar a degradação de uma floresta.
Kriska, David J. "Restoration of Black Oak (Quercus velutina) Sand Barrens via three different habitat management approaches". Cleveland State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=csu1506811044845704.
Pełny tekst źródłaDodonov, Pavel. "Influência de borda sobre vegetação e microclima no cerrado paulista". Universidade Federal de São Carlos, 2011. https://repositorio.ufscar.br/handle/ufscar/2009.
Pełny tekst źródłaUniversidade Federal de Minas Gerais
There is much variation in patterns of edge influence (EI) within a region due to factors such as vegetation structure, adjacent land use, orientation and edge contrast, and assessment of this variation is important for conservational planning. We studied EI on aspects of microclimate and vegetation in seven cerrado fragments in South-Eastern Brazil, sampling both savanna and forest vegetation. We located transects perpendicular to 14 cerrado edges adjacent to pastures, highways, sugarcane, silviculture, urban area, and forest roads. When significant, distance of EI varied from 15 to 80 m for temperature, 2 to 50 m for air moisture, 2 to 20 m for maximum vegetation height, 2 m for wind speed, 0 to 100 m for canopy cover, 0 to 20 m for exotic grass biomass, and 0 to 10 m for native grass biomass. The largest EI was observed in areas adjacent to pastures, but factors such as orientation, vegetations structure and land use were not sufficient to explain the observed variability. For conservation purposes, we recommend that buffers should be created between cerrado and the adjacent land use, especially in fragments adjacent to pastures and higways, in order to reduce EI.
Existe ampla variação nos padrões de influência de borda (IB) dentro de uma região, devido a fatores como estrutura da vegetação, uso da terra adjacente, orientação e contraste da borda. Entender esta variação é importante para o planejamento direcionado à conservação. Nós estudamos IB sobre aspectos de microclima e vegetação em sete fragmentos de cerrado no Sudeste do Brasil, amostrando áreas tanto de savana quanto de floresta. Nós delimitamos transectos perpendiculares a 14 bordas de cerrado adjacentes a pastagens, estradas, cana-de-açucar, silvicultura, área urbana e aceiros. Quando significativa, a distância de influência de borda variou de 15 a 80 m para temperatura, 2 a 50 m para umidade do ar, 2 m para velocidade do vento, 2 a 20 m para altura máxima de vegetação, 0 a 100 m para cobertura de dossel, 0 a 20 m para biomassa de gramíneas exóticas e 0 a 10 m para biomassa de gramíneas nativas. A maior IB foi observada em áreas adjacentes a pastages, mas fatores como orientação, estrutura da vegetação e uso da terra não foram suficientes para explicar a variabilidade observada. Para propósitos de conservação visando reduzir a IB, nós recomendamos a criação de zonas de amortecimento entre o cerrado e áreas adjacentes com outros usos da terra, especialmente em fragmentos adjacentes a pastagens e estradas.
Karlson, Martin. "Remote Sensing of Woodland Structure and Composition in the Sudano-Sahelian zone : Application of WorldView-2 and Landsat 8". Doctoral thesis, Linköpings universitet, Tema Miljöförändring, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-121536.
Pełny tekst źródłaMerparten av befolkningen i Sudano-Sahel zonen (SSZ) är beroende av naturresurser och ekosystemtjänster från woodlands (öppen torrskog) för att säkra sin försörjning. Tillgången av fältmätningar av vegetationens struktur och sammansättning är mycket låg i detta område, vilket utgör ett problem för forskning och miljöövervakning. Denna avhandling undersöker nyttan av fjärranalys för att kartlägga och analysera vegetation, främst träd, i SSZ. En omfattande litteraturöversikt genomfördes först för att undersöka hur tillämpningen av fjärranalys har utvecklats i SSZ mellan 1975 och 2014, samt att identifiera viktiga forskningsluckor. Några av de luckor som konstaterades i litteraturgenomgången låg till grund för de följande studierna där två nya satellitsystem (Worldview-2 och Landsat 8) utvärderades för deras användbarhet att kartlägga trädtäckets struktur och artsammansättning i ett woodland-område i centrala Burkina Faso. Resultaten visar att Worldview-2 är en värdefull datakälla för kartering av enskilda träd: 85.4% av referensträden detekterades och trädkronornas storlek uppskattades med ett medelfel av 45.6%. Worldview-2-data producerade även hög klassificeringsnoggrannhet för de fem lokalt viktigaste trädslagen. Den högsta noggrannheten (82.4%) uppnåddes med multi-temporal Worldview-2-data. Landsat 8 data visade sig mer lämpade för kartering av krontäcke, jämfört med biomassa. Medelfelet för karteringen var 41% för krontäcke och 66% för biomassa, på pixelnivå. Avhandlingen visar att lättillgängliga data från två satellitsystem är användbara för kartläggning av viktiga trädattribut i woodlands, samt diskuterar hur nyttan av fjärranalys för vegetationsanalys kan ökas ytterligare i SSZ.
BONARI, GIANMARIA. "DIFFERENT HABITAT AND TAXA: VARIOUS APPROACHES AND THEIR IMPLICATIONS FOR A LONG-SIGHTED MANAGEMENT AND CONSERVATION". Doctoral thesis, Università di Siena, 2017. http://hdl.handle.net/11365/1010508.
Pełny tekst źródłaDa, Ponte Canova Emmanuel [Verfasser]. "Assessment of forest cover dynamics in Paraguay A case study of the Upper Parana Atlantic Forest / Emmanuel Da Ponte Canova". Kiel : Universitätsbibliothek Kiel, 2018. http://d-nb.info/1165574179/34.
Pełny tekst źródłaDa, Ponte Emmanuel [Verfasser]. "Assessment of forest cover dynamics in Paraguay A case study of the Upper Parana Atlantic Forest / Emmanuel Da Ponte Canova". Kiel : Universitätsbibliothek Kiel, 2018. http://d-nb.info/1165574179/34.
Pełny tekst źródłaLindgren, Jessica. "Small remnant habitats : Important structures in fragmented landscapes". Doctoral thesis, Stockholms universitet, Institutionen för naturgeografi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-148653.
Pełny tekst źródłaResearch funder Ekoklim. Project:4339602.
At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 4: Manuscript.
Seide, Mariana Figur. "Dinâmica territorial e socioeconômica na região do entorno das Usinas Hidroelétricas Canoas I e II (PR/SP) e as relações com a piscicultura local". Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/91/91131/tde-17112015-110323/.
Pełny tekst źródłaTransformations in Earth life conditions are part of our evolutionary history. Currently human activities result in impacts of such magnitude that it has been proposed and widely accepted that we are entering a new geologic era, the Anthropocene. Human induced global changes are related to our modern way of life and the consumption model, as well as to demographic, economic, agricultural and industrial growth, that have an increasing resources demand. All these factors have potential compromising effects on ecosystems functions and good and services that they provide. Furthermore, fresh water ecosystems are highly impacted by river dams. These impoundments involve innumerous environmental and ecological, social and economic transformations, while surrounding areas can benefit from its water use. Understand the land use and cover dynamic and analyze if there are opportunities for new economic activities level the comprehension of their impacts for further environmental management. The overall objective of this study was to analyze the Hydroelectric Power Canoas I and II influence on the watershed counties, by a couple analysis of the spatial and temporal land use changes and the related socio-economic dynamic related to fish farming activities development. Our results show that agriculture and cattle ragging are the main driver of environmental and socio-economic behavior. An extreme native vegetation fragmentation was the most important ecological consequence of this process. In term of social and economic aspects, changes in the agricultural profile lead to an urbanization and rural exodus, marginalizing small framers. The constructions of Canoas I and II dams resulted in losses of agricultural lands, which was associated with an urban sprawl and an area increase of native vegetation patches and proximity index, indicating that they became more connected. For the interviewed local people. The dams represent an opportunity for fish farm developing, since it arouses interest in the population as an economic activity. However, there are difficulties to be overcame to meet the expectation of the impounded waters use.
Akhtar, Maqbool. "Competition analysis, nitrogen response and canopy cover assessment in sugarcane intercropping systems". Thesis, 1995. http://hdl.handle.net/10125/9268.
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