Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 133 for “"forest ecosystems"”.
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Restoring and valuing global kelp forest ecosystems
Kelp forests cover ~30% of the world’s coastline and are the largest biogenic marine habitat on earth. Across their distribution, kelp forests are essential for the healthy functioning of marine ecosystems and consequently underpin many of the benefits coastal societies receive from the ocean. …
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Stated and Revealed Preference Valuation of Forest Ecosystems
… which can also be applied to make evaluation of forest ecosystem. In the application of these evaluation methodologies, there always exists limitation from the data collection and empirical analysis. In the dissertation here, I extend the traditional evaluation methods with novel design or …
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Exotic Species Invasion and Biodiversity in Bangladesh Forest Ecosystems
… and drivers are two major issues in tropical forest ecosystems. This dissertation deals with these two issues in a tropical forest ecosystem in Bangladesh. Considering the first issue, it comprises two manuscripts: a systematic review and a field survey in Bangladesh forest ecosystem. The …
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Applications of Imaging Spectroscopy in Forest Ecosystems at Multiple Scales
Forests provide a number of ecosystem services which sustain and enrich the wildlife, human societies, and the environment. However, many disturbances threaten forest ecosystems, making it necessary to monitor their health for optimal management and conservation. Although there are many indicators …
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Carbon sequestration in short-rotation forestry plantations and in Belgian forest ecosystems
In deze studie werd nagegaan in hoeverre plantages met een korte omloopstijd en Belgische bossen kunnen bijdragen tot het bereiken van de broeikasgasemissiereductiedoelstelling die de Belgische overheid aangegaan is onder het Kyoto Protocol.
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Role of Dissolved Organic Nitrogen in the Soil Nitrogen Cycle of Forest Ecosystems
… to be a crucial part of the soil N cycle in forest ecosystems. Despite this, information on its dynamics, sources and fate is still lacking. Especially data from (sub)tropical forest ecosystems are scarce. Therefore, this study investigated (i) the magnitude and drivers of DON fluxes in a …
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Mechanisms of nutrient limitation and nutrient acquisition in managed and unmanaged forest ecosystems
… and other factors on biogeochemical processes in forests is necessary to ensure the sustainability of forest management. Here I report the results of several investigations into nutrient acquisition processes in the forests of New Hampshire. I begin with a meta-analysis of fertilization studies …
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Fly ash impact in forest ecosystems in Northeastern Germany – an assessment and regionalization approach
The presented doctoral thesis “Fly ash impact in forest ecosystems in Northeastern Germany - an assessment and regionalization approach” intends to (a) test if the field assessment of ferrimagnetic susceptibility can be used as cost efficient method to get information on fly ash deposition impacted …
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Effects of land management and climate change on soil microbial communities in Appalachian forest ecosystems
In terrestrial ecosystems, microorganisms are the dominant drivers of virtually all ecosystem processes, particularly cycling of carbon (C), nitrogen (N), and phosphorus (P). These microbial functions are critical for promoting ecosystem services that support human well-being, such as provisioning …
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Natural abundance of ¹⁵N as a tool for assessing patterns of nitrogen loss from forest ecosystems
… of the nitrogen cycling history of a site. Among ecosystems with contrasting nitrate loss patterns, the [delta]15 N of soil and plant material should be higher at sites with higher nitrate losses. An underlying assumption in natural abundance isotope studies is that soil [delta]15 N is at …
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Forest floor seed banks and their response to slashburning in some forest ecosystems in south central British Columbia
Soil seed banks are part of the flora of many ecosystems, but little is known about those of temperate coniferous forests in B.C., or their response to different disturbances. As a result, a study of forest floor seed banks and their response to the common disturbances of clearcutting and …
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Factors Affecting Nitrogen Fixation Rates in Termites (Isoptera: Rhinotermitidae: <i>Reticulitermes</i>) and Termite Nitrogen Contributions of Forest Ecosystems
… in the biogeochemical cycling of nitrogen in ecosystems. The objective of this study was to estimate annual nitrogen contributions by termites by examining seasonal rates of nitrogen fixation, seasonal abundance of different termite castes and their nitrogenase activity, the effects of dietary …
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Effects of land-use changes on the properties of a Nitisol and hydrological and biogeochemical processes in different forest ecosystems at Munesa, south-eastern Ethiopia
The effects of conversion of natural forest into different exotic tree species plantations and crop cultivation were investigated at Munesa, south-eastern Ethiopia with the objectives of (i) determining changes on soil physical and chemical properties, (ii) quantifying water and nutrient fluxes …
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Changes in food web structure and energy flow in kelp forest ecosystems on the south-west coast of South Africa following the invasion of Jasus lalandii
In the early 1990s the west coast rock lobster Jasus lalandii underwent an eastward shift in distribution into an area known as East of Cape Hangklip where they had previously been rare. This shift has also been termed an invasion and resulted in a complete change in the benthic community …
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Wildfires for resilience in California’s Sierra Nevada: fine-scale assessment at regional scales with airborne lidar
Montane forest ecosystems in western North America hold significant ecological and social value. However, these valued forest ecosystems are at heightened risk in the modern era due to a warming climate and increasingly severe wildfires, droughts, and bark beetle outbreaks. In dry forest types, a …
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Hunting for humans in forest ecosystems : are the traces of Iron-age people detectable? : an investigation into the importance of Iron-age slash-an-burn agriculture in KwaZulu-Natal forests using compositional and demographic data and carbon isotope techniques
… Cali 1998). This is certainly the case for many forest systems (Binford eta/ 1987, Balee 1989, Northrop & Horn 1996, Noble & Dirzo 1997, Ogden eta/ 1998, Lindbladh & Bradshaw 1998, Foster et a/1999). This thesis attempts to answer, for forest ecosystems, the question posed almost 20 years ago by …
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