Дисертації з теми "Center for Tropical Forest Science"
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Lammerant, Roel. "Impact of experimental soil moisture manipulation on tropical tree seedling demographic fates and functional traits." Thesis, Uppsala universitet, Institutionen för biologisk grundutbildning, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-436103.
Повний текст джерелаCarver, Daniel Peter. "Assessment of the Representational Accuracy of GlobeLand30 Classification of the Temperate and Tropical Forest of Mexico." Thesis, University of Colorado at Denver, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10275782.
Повний текст джерелаThis study performed an assessment of the representational accuracy of the forest class of the GlobeLand30 (GL30) global land cover data sets for the country of Mexico using a robust geographically distributed forest inventory survey of the forests in Mexico. The representational accuracy assessment was carried out for both the 2000 and 2010 GL30 data sets. The detailed attribute data associated with the validation set demonstrates how GL30 classifies specific forest types and how canopy coverage and number for trees per site influence the likelihood of GL30 identifying the sites correctly as forests. The results indicate that producers accuracies range from 72.3% to 97.3%. The tropical forests (89.1%) were better represented by the GL30 forest class than the temperate forest (73.9%). The most poorly represented classes from the temperate (oak: 72.3%) and tropical (low dry deciduous jungle: 74.9%) groups were deciduous. Receiver Operator Curve and Area Under the Curve analyses show that canopy coverage of a site is a better predictor of GL30, correctly identifying the site as forest for temperate forest, and that the number of the trees per site is a better predictor of GL30 correctly identifying a site as forest for tropical forests. The results also indicate a distinct spatial variability in the location of the sample sites that are misidentified as forests by GL30. The results of this thesis will help researchers and professionals better understand the representational accuracy of the GL30 data sets for the forests in Mexico.
Kefa, Christopher Amutabi. "Assessing the Impacts of Bioenergy Extraction and Human Land Use of the Biodiversity of Kakamega Tropical Rainforest, Kenya." Bowling Green State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1465254368.
Повний текст джерелаMlotha, McArd Joseph. "Analysis of Land Use/Land Cover Change Impacts Upon Ecosystem Services in Montane Tropical Forest of Rwanda: Forest Carbon Assessment and REDD+ Preparedness." Antioch University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=antioch1527773591460797.
Повний текст джерелаChi, Curtis H. "Architecture and site: a field research center for the studies of environmental science, horticulture, landscape architecture, and forestry." Thesis, Virginia Polytechnic Institute and State University, 1993. http://hdl.handle.net/10919/53344.
Повний текст джерелаMaster of Architecture
Chanyenga, Tembo Faera. "Effect of population size on viable seed output, seed rand and natural regeneration pattern of a tropical conifer Widdringtonia whytei-Rendle in Malawi." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85589.
Повний текст джерелаENGLISH ABSTRACT: Widdringtonia whytei is a tropical endemic, fire-adapted pioneer coniferous tree species within natural fire-fragmented Afromontane forest patches in a confined area on Mulanje Mountain in Malawi. Natural and anthropogenic fires within the surrounding fire-prone landscape, insect attacks, and uncontrolled harvesting of mature trees for timber threaten the survival of W. whytei. This study investigated the effects of population fragmentation on the reproductive biology of W. whytei, through four specific studies: effects of population size, tree size and crown position on viable seed output; seed rain variation among population sizes; effects of temperature and light on viability and germination of W. whytei seeds; and the influence of population size on natural regeneration patterns. The study was conducted during 2008 and 2009 on three sites using three W. whytei population sizes: small (≤10 reproductively mature cone-bearing W. whytei trees), medium (11-20 cone-bearing trees) and large (>20 cone-bearing trees). Data were collected using field and laboratory experiments and a review of secondary information. The effect of fragment size and crown position on viable seed output and seed rain pattern was tested with a nested linear mixed model. The influence of stem diameter (dbh) on viable seed output was tested using a separate data set. The variation in seed rain was explored with a generalised linear model (GLM) with a negative binomial link function. Variations in seed germination was analysed with a Weibull regression model. The influence of fragment size on seedling regeneration was tested with a GLM (binary logistic regression). Viable seed output from W. whytei cones was very low (23%) and was not affected by population size, tree diameter or crown position. W. whytei population size influenced seed rain with large fragments having higher seed rain densities. Number of dispersed seeds was generally very low and poorly dispersed. W. whytei cones are semiserotinous and depends on moderate to severe fires for heavy seedfall and wider dispersal. Such fires did not occur during the study period. Temperature is a critical factor for seed germination. Seeds germinate between 15 and 25°C with the optimum at ~ 20°C either under light or dark conditions. Regeneration density followed the seed rain pattern indicating that seed availability is a critical factor for regeneration. Regular cool fires outside the forest patches and along the edges during the hot dry season, and the thick litter layer and shady conditions inside forest patches, caused most of the seedling mortality. This study highlighted the difficulties W. whytei experiences with low output of viable seed, limited seed dispersal and low seedling regeneration in and around forest patches, i.e. factors important for conservation management of this species. It is recommended that gaps with diameter equal to canopy height and occasional spot fires would promote seed dispersal onto exposed mineral soil for rapid seedling establishment and subsequent population growth. Such natural fire disturbance events may show the true seed rain and seedling establishment patterns in this species.
AFRIKAANSE OPSOMMING: Widdringtonia whytei is ‘n tropiese endemiese, vuuraangepaste pionier naaldhoutagtige boomsoort binne die natuurlike vuurgefragmenteerde Afromontane woudkolle binne ‘n beperkte area op Mulanje berg in Malawi. Natuurlike en menslike vure binne die omringende vuurgeneigde landskap, insekaanvalle, en onbeheerde kap van volwasse bome vir hout bedreig die voortbestaan van W. whytei. Hierdie studie het die effek van populasiefragmentasie op die voortplantingsbiologie van W. whytei ondersoek, deur vier spesifieke studies: die effek van populasiegrootte, boomgrootte en kroonposisie op produksie van lewenskragtige saad; saadreënvariasie tussen populasiegroottes; die effek van temperatuur en lig op lewenskragtigheid en ontkieming van W. whytei saad; en die invloed van populasiegrootte op natuurlike verjongingspatrone. Die studie is gedurende 2008 en 2009 uitgevoer op drie groeiplekke met drie W. whytei populasiegroottes: klein (≤10 keëldraende (volwasse) W. whytei bome), medium (11-20 keëldraende bome) en groot (>20 keëldraende bome). Data is versamel in veld- en laboratorium eksperimente asook 'n oorsig van sekondêre inligting. Die invloed van populasie fragmentgrootte en kroonposisie van bome op saadproduksie en die saadreënpatroon is getoets met ‘n geneste liniêre gemengde model. Die invloed van boomstamdeursnee op die produksie van kiemkragtige saad is met ‘n aparte datastel getoets. Die variasie in saadreënpatroon is met 'n algemene liniêre model (GLM) met 'n negatiewe binomiese skakelfunksie getoets. Variasies in ontkiemingspersentasie van sade is met 'n Weibull regressiemodel ontleed. Die invloed van fragmentgrootte op saailingverjonging is met 'n algemene linêre model (binêre logistiese regressie) getoets. Produksie van lewenskragtige saad in W. whytei keëls was baie lag (23%) en was nie deur populasiegrootte, boomstamdeursnee of kroonposisie beïnvloed nie. W. whytei populasiegrootte het saadreën beïnvloed en groot fragmente het groter saadreëndigthede gehad. Die aantal verspreide sade was in die algemeen baie laag en swak versprei. W. whytei keëls is semi-saadhoudend (serotinous) en is afhanklik van matige tot intense vure vir massiewe saadvrystelling en wyer saadverspreiding. Sulke vure het nie gedurende die studieperiode voorgekom nie. Temperatuur is ‘n kritiese factor vir saadontkieming. Sade ontkiem goed tussen 15 en 25°C met die optimum rondom ~ 20°C onder beide lig en donker toestande. Fragmentgrootte het nie die saailingverjonging in W. whytei beïnvloed nie. Verjongingsdigtheid het die saadreënpatroon gevolg, wat daarop dui dat saadbeskikbaarheid ‘n kritiese factor is vir saailingverjonging. Gereelde koel vure buite die woudkolle en langs die woudrand gedurende die droë warm seisoen, en die dik lae blaarval (litter) en skadutoestande binne ‘n woud, het meeste van die saailingmortaliteit veroorsaak. Hierdie studie het die probleme beklemtoon wat W. whytei ondervind met die lae produksie van kiemkragtige saad, saadverspreiding en saailingverjonging binne en rondom die woudkolle, m.a.w. faktore wat belangrik is vir bewaringsbestuur van hierdie boomsoort. Die aanbeveling word gemaak dat kroonopeninge met ‘n deursnee gelyk aan minstens die kroonhoogte, en sporadiese kolbrande binne die woudkolle kan saadverspreiding op blootgestelde minerale grond vir vinnige saailingvestiging en gevolglike populasiegroei bevorder. Sodanige vuurversteuringsgeleenthede mag die werklike patrone in saadreën en saailingvestiging in hierdie species toon.
Gleitsmann, Anke. "Exploiting the spatial information in high resolution satellite data and utilising multi-source data for tropical mountain forest and land cover mapping." Doctoral thesis, Stuttgart Ibidem-Verl, 2005. http://deposit.d-nb.de/cgi-bin/dokserv?id=2852171&prov=M&dok_var=1&dok_ext=htm.
Повний текст джерелаDechert, Georg. "Nutrient dynamics and their control in land use systems of forest margins in Central Sulawesi, Indonesia." Doctoral thesis, [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=970744676.
Повний текст джерела"The susceptibility of tropical forest bird communities to habitat fragmentation." Tulane University, 2007.
Знайти повний текст джерелаacase@tulane.edu
Harteveld, Marieke. "The impact of forest disturbance on the fine root system of a tropical forest on Sulawesi, Indonesia." Doctoral thesis, 2007. http://hdl.handle.net/11858/00-1735-0000-0006-ACD6-3.
Повний текст джерелаUnger, 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.
Повний текст джерела"Evaluating the Social and Ecological Drivers of Invasive Plant Species Abundance in Sub-tropical Community Forests of Nepal." Doctoral diss., 2020. http://hdl.handle.net/2286/R.I.62806.
Повний текст джерелаDissertation/Thesis
Doctoral Dissertation Environmental and Resource Management 2020
Köhler, Birgit. "Soil nitrogen oxide and carbon dioxide emissions from a tropical lowland and montane forest exposed to elevated nitrogen input." Doctoral thesis, 2009. http://hdl.handle.net/11858/00-1735-0000-0006-B67E-B.
Повний текст джерелаZach, Alexandra. "Carbon release from woody parts of trees along an elevation gradient in a tropical montane moist forest of Southern Ecuador." Doctoral thesis, 2008. http://hdl.handle.net/11858/00-1735-0000-0006-B63E-A.
Повний текст джерелаRodriguez, Aponte Glenda Ysolina. "Changes in tropical rainforests landscapes as a consequence of selective logging and indigenous shifting cultivation in Forest Reserve Imataca (central zone) Bolívar State, Venezuela." Doctoral thesis, 2005. http://hdl.handle.net/11858/00-1735-0000-0006-B255-9.
Повний текст джерелаMandl, Nicole. "Bryophyte and macrolichen diversity of the Purdiaea nutans forest in southern Ecuador and its relationship to soil, climate and vegetation structure." Doctoral thesis, 2007. http://hdl.handle.net/11858/00-1735-0000-0006-AD0D-1.
Повний текст джерелаJacome, Reyes Jorge Hernan. "Factors controlling the lower elevational limits in tropical montane plants in the Andes and their implications under the current climatic change." Doctoral thesis, 2005. http://hdl.handle.net/11858/00-1735-0000-0006-B6D5-3.
Повний текст джерелаLeitner, Daniela. "Auswirkungen von ENSO-Trockenperioden und Landnutzungspraktiken auf die Dynamik von C, N und P in einem tropischen Regenwald und in Agroforst-Systemen in Zentral-Sulawesi, Indonesien." Doctoral thesis, 2010. http://hdl.handle.net/11858/00-1735-0000-0006-B2E8-0.
Повний текст джерелаBohman, Kerstin. "Functional and Morphological Diversity of Trees in Different Land Use Types along a Rainforest Margin in Sulawesi, Indonesia." Doctoral thesis, 2004. http://hdl.handle.net/11858/00-1735-0000-000D-F145-7.
Повний текст джерелаSchawe, Marcus. "Hypsometrischer Klima- und Bodenwandel in Bergregenwaldökosystemen Boliviens." Doctoral thesis, 2005. http://hdl.handle.net/11858/00-1735-0000-0006-B331-2.
Повний текст джерелаHolz, Ingo. "Diversity and Ecology of Bryophytes and Macrolichens in Primary and Secondary Montane Quercus Forests, Cordillera de Talamanca, Costa Rica." Doctoral thesis, 2003. http://hdl.handle.net/11858/00-1735-0000-0006-B682-0.
Повний текст джерелаMoser, 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.
Повний текст джерелаPangau-Adam, Margaretha Zusje. "Vogelnest-Prädation in Waldrandgebieten in Lore Lindu National Park, Zentral Sulawesi, Indonesien." Doctoral thesis, 2003. http://hdl.handle.net/11858/00-1735-0000-0006-AE7F-8.
Повний текст джерела