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Dissertations / Theses on the topic 'Moist tropical forest'

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Published: 3 June 2025
Last updated: 7 July 2025

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1

Foli, Ernest G. "An assessment of forest responses to silvicultural interventions in tropical moist forest in Ghana." Thesis, University of Aberdeen, 2005. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU203211.

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This study examines the effects, 40 y later, of silvicultural interventions on forest structure, stand productivity and composition and diversity of species in Bobiri Forest Reserve in Ghana. Data were gathered from stands treated under three silvicultural systems: the Tropical Shelterwood System (TSS), the Post-exploitation System (PES) and the Girth Limit Selection System with post-harvest refinement (GLS), along with comparative data from unlogged (UNL) forest. Forty years later, the treated stands were structurally similar 40 to unlogged forest, although stem densities were higher in the former relative to the latter. Six dominant families of species were common to both treated and unlogged forest. Species richness and diversity were higher in PES, GLS and UNL forest relative to TSS forest. In contrast to unlogged forest where shade tolerant species were dominant, non-pioneer light-demanders were dominant in the treated stands. Liana densities were similar in the different types of treated forest but higher in unlogged forest. The numbers of commercial species were not different between treated and unlogged forest, although whereas >50% of species in TSS forest were commercial, >50% of species in PES, GLS and UNL forest were non-commercial species. Additionally, the densities of commercial stems were about twice higher in TSS and PES relative to unlogged forest. Total standing volumes of crop trees DBH>30 cm in GLS (&sim;349 m 3 ha-1) and TSS (308 m3 ha-1 ) were comparable to &sim;251 m3 ha-1 in unlogged forest but higher relative to &sim;242 m3 ha -1 in PES. The desirable commercial species contributed >50% of total standing volume of crop trees in TSS and PES forest but <40% in GLS and unlogged forest. Also, there was better representation of good quality commercial stems in treated forest relative to unlogged forest.
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2

Wan, Hassan Wan Azli. "Modelling the impact of Southeast Asian deforestation on climate and the atmospheric circulation." Thesis, University of East Anglia, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365061.

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3

Mangenet, Thomas. "Approche rétrospective des cycles phénologiques chez quelques espèces guyanaises : vers une nouvelle branche de la dendrochronologie ?" Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20243/document.

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L'objectif de cette thèse est l'étude rétrospective du développement de la couronne de quelques grands arbres de la forêt tropicale humide guyanaise. Nous avons retenu plusieurs espèces possédant des tempéraments écologiques, des modèles architecturaux et des cycles phénologiques variés, mais présentant toutes au moins un marqueur morphologique ou anatomique susceptible d'être utilisé dans le cadre d'une analyse rétrospective de l'appareil caulinaire. Nous avons décrit des branches sommitales représentatives de la croissance en hauteur et de la reproduction des individus. Parallèlement, nous avons mis en place un suivi phénologique mensuel afin de pouvoir confronter les résultats issus des descriptions rétrospectives aux résultats du suivi phénologique. L'analyse rétrospective de l'appareil caulinaire permet de reconstituer l'histoire des structures ramifiées sur 10 à 15 cycles de développement en moyenne, mais nous avons pu remonter jusqu'à 40 cycles chez certaines espèces. Les informations recueillies nous renseignent sur l'organisation intrinsèque du cycle phénologique de l'organisme ainsi que sur les modalités de construction et de reproduction de l'espèce. Le fait de pouvoir reconstituer l'histoire des différents méristèmes permet dans certains cas d'approcher les relations trophiques qu'ils entretiennent dans l'espace et dans le temps au sein des structures ramifiées. Finalement, le cadre temporel relatif dans lequel sont replacés les processus développementaux autorise la comparaison d'espèces dont les cycles phénologiques ont des dimensions temporelles absolues différentes dans un cadre temporel relatif identique, dont « l'unité » est l'expression morphologique du cycle phénologique dans son ensemble. L'analyse rétrospective de l'appareil caulinaire des arbres tropicaux apparait donc comme une méthode à la fois souple et robuste, complémentaire des suivis de croissance et de suivis phénologiques plus traditionnels. Les résultats obtenus sont originaux et nouveaux dans le domaine de l'écologie tropicale et ils ouvrent des perspectives intéressantes et prometteuses<br>The aim of this thesis is to study retrospectively the crown development of large canopy trees of French Guiana. We choose several species expressing various ecological behaviors, architectural developments and phenologies which had at least one morphological or anatomical marker usable in retrospective analysis. We described well sun exposed branches that were representative of individuals' height-growth and reproduction. Simultaneously, we conducted a monthly phenological survey in order to compare our hypotheses from the retrospective analysis to the phenological data. The retrospective analysis allowed us to reconstruct the last 10 to 15 developmental cycles within the branches in mean, sometimes up to 40 cycles in some species. Data give information on the species' intrinsic phenological organization as on growth modalities and reproduction. We could access to the meristems history within the branches and in some case, we could approach meristems interactions on a trophic level. Finally, we could compare species with various phenological strategies within the same relative temporal frame given that is given by the retrospective analysis. The retrospective analysis appears to be a reliable complementary tool that gives access to new and original results in tropical tree study
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4

Samnegård, Ulrika. "The impact of forest on pest damage, pollinators and pollination services in an Ethiopian agricultural landscape." Doctoral thesis, Stockholms universitet, Institutionen för ekologi, miljö och botanik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-126669.

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The distribution of wild biodiversity in agroecosystems affect crop performance and yield in various ways. In this thesis I have studied the impact of wild biodiversity, in terms of trees and forest structures, on crop pests, pollinators and the pollination services provided in a heterogeneous landscape in southwestern Ethiopia.  Coffee, Coffea arabica, is a forest shrub native to Ethiopia and is grown in most wooded areas in the landscape where I conducted my studies. Wild coffee is still found in remote parts of the forests in the landscape. For my first paper, I surveyed pest damage on coffee in coffee forest sites, where some sites were situated in continuous forest and some in isolated forest patches. I found the variation in pest damage frequency to mainly be among coffee plants within a site, rather than among sites, which indicates the importance of local processes. However, some pests were clearly connected to the forest habitat, such as the olive baboon. In my second study, I surveyed pollinators visiting coffee flowers across a gradient of shade-tree structures. I found the semi-wild honeybee to be the dominating flower visitor. The abundance of the honeybee was not related to shade-tree structures, but to amount of coffee flower resources in the site. On the other hand, other pollinators, which included other bee species and hoverflies, were positively affected by more shade trees in the site. In my third study I investigated how the forest cover affected local bee communities in the agricultural landscape. Moreover, I investigated if this relationship differed between the dry and rainy season. The distribution of food resources for bees changes between the seasons, which may affect the bees. Most trees, fruit trees and coffee, which are patchy resources, flowers in the dry season, whereas most herbs and annual crops, which are more evenly spread resources, flowers during the rainy season. I found a clear turnover in bee species composition between the dry and rainy season, with more mobile species in the dry season. Increased forest cover in the surrounding landscape had a positive impact on bee abundance and species richness. However, the impact did not change between seasons. In my fourth study I evaluated the pollination success and pollen limitation of a common oil crop in the landscape in relation to forest cover. I found severe pollen limitation across the landscape, which may be related to the observed low bee abundances. The pollen limitation was not related to surrounding forest cover. In conclusion, I have found the forest and wooded habitats to impact several mobile animals and pathogens in our study landscape, which in turn affect people. However, there is large complexity in nature and general relationships between forest structures and all crop related organisms may be unlikely to find. Various species are dependent on different resources, at different spatial scales and are interacting with several other species. To develop management strategies for increased pollination services, for reduced pest damage or for conservation in the landscape, more species-specific knowledge is needed.<br><p>At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 4: Manuscript.</p>
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5

Robison, D. M. "A soil-based assessment of the sustainability of a zero-input alternative to shifting cultivation in the tropical moist forest of Alto Beni, Bolivia." Thesis, University of Reading, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376785.

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6

Rahman, Mizanur [Verfasser], Achim [Akademischer Betreuer] Bräuning, and Manuel [Gutachter] Steinbauer. "Growth and physiological responses of South Asian tropical moist forest trees to atmospheric CO2 and climate change / Mizanur Rahman ; Gutachter: Manuel Steinbauer ; Betreuer: Achim Bräuning." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2019. http://d-nb.info/1217065121/34.

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7

Ramos-Prado, J. M. "Ecophysiological studies on four species of tropical trees." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/14245.

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8

Banyard, Sydney G. "Cluster point sampling in moist tropical forests using large basal area factors." Thesis, Bangor University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235783.

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9

Warwick-Smith, Robert Myles. "Remote sensing for conservation of tropical moist forests : a study in Indonesia." Thesis, SOAS, University of London, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338150.

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10

Gombya-Ssembajjwe, William. "Analysis of institutional incentives for sustainable management of tropical moist forests : a case study of mengo forests, Uganda." Thesis, Bangor University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318568.

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11

Kupers, Stefan Jonathan. "The Soil Moisture Niche in a Moist Tropical Forest – A Demographic Approach." 2019. https://ul.qucosa.de/id/qucosa%3A37543.

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Water availability affects tree species performance and distributions in tropical forests. However, there are no studies that have measured detailed spatial variation in soil water availability within a tropical forest. This limits our understanding of how water availability shapes the demography and distributions of tree species within tropical forests. In this dissertation, I measured detailed spatial variation in soil water potential (SWP), the relevant measure of water availability for plant performance, in the seasonal tropical moist forest of the 50-ha Forest Dynamics Plot on Barro Colorado Island, Panama. In Paper 1, I mapped spatial variation in SWP across the 50-ha plot in various stages of the dry season using information on topography, soil type, dry season intensity and more. In Paper 2, I quantified the soil moisture niches of species in terms of demographic responses (growth and mortality) and species distributions. I related seedling growth and mortality responses to SWP of 62 species to their distributional centre along the SWP gradient, using data from 20 years of annual seedling censuses across 200 seedling census sites. I found that species that grew faster (slow) with increasing SWP were more common on wetter (drier) parts of the SWP gradient. Moreover, wet-distributed species grew faster on the wet side of the SWP gradient than dry-distributed species. Mortality was unrelated to species distributions but decreased strongly with seedling height. These findings indicate that species with a growth advantage with respect to SWP grow faster out of the vulnerable small size ranges, reducing their mortality in later seedling stages and thus shaping species distributions indirectly. This mechanism is a form of niche differentiation that contributes to species coexistence. In Paper 3, I related seedling growth and mortality responses to spatiotemporal variation in water availability with responses to light availability, another highly limiting resource in tropical forests. I found an interspecific trade-off in responses to shade versus inter-annual drought (dry season intensity): species that performed relatively well in the shade performed worse during more severe dry seasons and vice versa. This trade-off enables coexistence, because species are adapted to perform well under either shade or drought. In sum, water availability contributes to the maintenance of the high diversity of tropical forests through hydrological niche differentiation and a trade-off between performance in shade versus drought. Future work can use my SWP maps and species responses to SWP to identify the functional traits that underlie the species responses and improve Dynamic Global Vegetation Models. Finally, my work facilitates the prediction of future species composition, diversity and ecosystem functioning of tropical forests with shifts in rainfall patterns caused by climate change.
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12

Unger, 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.

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13

Zach, 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.

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14

Belk, Ellizabeth Leslie. "Modeling the effects of partial throughfall exclusion on the distribution of soil water in a Brazilian Oxisol under tropical moist forest." 2002. http://purl.galileo.usg.edu/uga%5Fetd/belk%5Felizabeth%5Fl%5F200212%5Fms.

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15

Unger, Malte Arne [Verfasser]. "Relationships between soil chemical properties and forest structure, productivity and floristic diversity along an altitudinal transect of moist tropical forest in Amazonia, Ecuador / vorgelegt von Malte Arne Unger." 2010. http://d-nb.info/1007243716/34.

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16

Zach, Alexandra [Verfasser]. "Carbon release from woody parts of trees along an elevation gradient in a tropical montane moist forest of Southern Ecuador / vorgelegt von Alexandra Zach." 2008. http://d-nb.info/99115066X/34.

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