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 34 for “"temperate forest"”.
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Microbial diversity and activity in temperate forest and grassland ecosystems
… oxidizing bacteria diversity and function in forest and grassland soils with focus on the influence of (a) functional group identity of grassland plants (legumes, grasses, forbs), (b) grassland plant species richness and (c) tree species, on AOB diversity and function. Another objective of …
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Methane Fluxes from Living and Dead Trees in a Temperate Forest
… identified as an important source of methane in forest ecosystems, but little research exists on fluxes beyond their stems, such as those from foliage, branches, wounds, and coarse woody debris. Recent instrumentation advances allow rapid and accurate measurements of relatively low methane flux …
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Carbon and nitrogen mineralization in temperate forest soils at low temperatures
… carbon (C) and nitrogen (N) mineralization in temperate forest soils was often considered negligible at low temperatures during the dormant season, which is questioned by recent findings. Climate models predict warmer winters but little is known about the temperature sensitivity of C and N …
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Understanding Effects of Anthropogenic Activities on Element Cycling in Temperate Forest Watersheds
… human activities have altered element cycling in temperate forests in the southern Appalachian Mountains. </p><p>In Chapter 2, we present results from repeated synoptic surveys of streamwater chemistry for ~30 watersheds spanning one of the largest nitrogen (N) deposition gradients in North …
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Environmental and developmental regulation of carbon cycling in a warm-temperate forest
… sink for atmospheric CO2, the growth of young temperate forests, may decline as these forests mature and undergo successional change in community composition and an expected decline in Net Primary Production (NPP) with increasing age. To examine the effect of elevated atmospheric CO2 …
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Soil organic matter dynamics in a temperate forest influenced by extreme weather events
… Podzol under a 140 years old Norway spruce forest in the Fichtelgebirge mountains (Bavaria, German) within two laboratory and two field studies. In one laboratory study, we investigated the effect of frost intensity and repeated freeze/thaw cycles. Undisturbed soil columns comprising organic …
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Environmental controls on the abundance, diversity, growth, and activity of ammonia-oxidizing microorganisms in temperate forest soils
… of ammonia-oxidizing microbial communities in temperate forest soils. Accomplishing this goal required a hybrid approach: I used modern molecular biology techniques alongside soil biogeochemical measurements and framed my research using ecological theory largely developed in plant systems. All …
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Tree Growth and Carbon Balance in a Temperate Forest Exposed to Elevated Carbon Dioxide for Eight Years
… influence plant carbon uptake and because forests account for the bulk of terrestrial productivity the future role of forests in the carbon cycle is a subject of current scientific interest. This research investigates processes related to the carbon balance of a forest exposed to elevated …
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Belowground Carbon Budget and Nutrient Uptake of Temperate Forest Species in Response to Elevated Carbon Dioxide and Temperature
A large proportion of carbon in forest ecosystems is lost from belowground through root respiration. Maintenance respiration of attached fine roots was measured on mature loblolly pine and sweetgum (Liquidambar styraciflua ) growing in atmospheric CO2 elevated by 200 mu1 1 -1 above ambient. Fine …
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From Small to Large: Modeling at the Scale of Ecological Processes to Understand Temperate Forest Range Limits, Biomass, and Traits
… observational datasets, national forest inventories from temperate regions, with the aim to understand how forest communities may respond to future climate. In each chapter, the methodological focus on scale is conceptually linked with the ecological questions posed.</p><p>In the …
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Land-use change effects on soil organic carbon, total soil nitrogen, and soil erosion in a temperate forest and grassland
… paired sites were used in the study, one a forest and cropland on a loess-derived Alfisol in Southern Illinois and the other a prairie and cropland on a Mollisol derived from loess over glacial till in Western Iowa. Tree ring data suggest that the forested site has been intact for about 70 …
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SOIL ORGANIC CARBON IN MID-ATLANTIC REGION FOREST SOILS: STOCKS AND VERTICAL DISTRIBUTION
… pool of organic carbon (Boschi et al., 2018) and temperate forest soils have been a major sink for atmospheric carbon; however, determining the size of the soil organic carbon stock can be problematic. Sampling practices vary for sampling depth, and determining the density of the soil. The …
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Objective and subjective temperature effects of virtual reality
… environment and the control condition of a temperate forest environment. It was hypothesized that participants would experience an objective surface temperature decrease as well as a subjective body temperature decrease in the experimental condition. Results revealed no significant objective …
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Phylogeography of eastern leatherwood (Dirca palustris L.) resolved by chloroplast sequencing and microsatellite genotyping
… with its patchy restriction to rich, mesic forests and the paucity of vectors for dispersal of its seeds, represents a classic example of Reid's paradox of plant migration. It long has been presumed that temperate forest species of eastern North America persisted in southern glacial refugia …
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Population Dynamics of Ouachita Dusky Salamanders (Desmognathus brimleyorum) in a Managed Forest Landscape
… of landscapes increasing world-wide, managed forests are increasingly important as providers of ecosystem services including habitat for numerous wildlife species. It is crucial to maintain a balance between timber production and conservation of biodiversity on managed landscapes. Salamander …
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Partitioning of multivariate phenotypes using regression trees reveals complex patterns of adaptation to climate across the range of black cottonwood (Populus trichocarpa)
Local adaptation to climate in temperate forest trees involves the integration of multiple physiological, morphological, and phenological traits. Latitudinal clines for the relevant component traits are frequently observed for species that have a north-south distribution, but these relationships do …
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Forest Isoprene Emissions: New Insights from a Novel Field Instrument
… variation of isoprene concentrations within forests and across different forest types, presenting a challenge for understanding overall emissions. Current understanding of isoprene is limited by the lack of availability of suitable instrumentation for deployment in key field sites. In this …
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Remote detection of forest structure in the White Mountains of New Hampshire: An integration of waveform lidar and hyperspectral remote sensing data
… various aspects of the structure of a northern temperate forest is explored. Waveform lidar imagery was acquired in 1999 and 2003 over Bartlett Experimental Forest in the White Mountains of central New Hampshire using NASA's airborne Laser Vegetation Imaging Sensor (LVIS). High-resolution …
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Forest disturbance, mosquito vector ecology and La Crosse virus dynamics in southwestern Virginia
The influence of forest canopy disturbance (FCD) on La Crosse virus (LACV), leading cause of US pediatric arboviral encephalitis, is critical to understand in landscapes where forests are periodically harvested. Southwestern Virginia is part of an emerging focus of this interior forest bunyavirus. …
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