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 51 for “"Moisture Availability"”.
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Phenotypic Plasticity of Native and Invasive Cool-Season Grasses in Response to Frequency of Moisture Availability
… wheatgrass)). In part one, I created water availability stress in three different soils. Biomass of each species was compared between high, medium, and low watering frequencies to determine plasticity of native and invasive species in response to moisture variability. In part two, the same …
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Sensitivity of northern red oak (Quercus rubra L.) to variation of temperature and moisture availability along latitudinal and longitudinal climate gradients
… high inter-annual variability in soil moisture. Increased early growing season site water balance and precipitation was associated with greater radial growth in the western third of red oak's range, partially supporting the hypothesis that the western range limit is defined by limited …
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Radial growth patterns of jack pine in relation to climate, moisture availability, and dwarf mistletoe infection in the Boreal Plains Ecozone of Saskatchewan, Canada
… and uninfected stands, across the regional moisture gradient associated with the boundary of the boreal forest in southern Saskatchewan. I sampled across three study regions extending from remnant island forests in the drier Aspen Parkland Ecoregion, to the wetter interior of the mid-boreal …
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A 210,000-year reconstruction of subtropical climates from Fern Gully Lagoon, North Stradbroke Island (Minjerribah), Australia
… 29 ka) records, allowing a continental record of moisture availability to be created, and moisture availability during peak Australian megafauna extinction to be identified (Chapter 2). • A chronology for a new wetland sediment record from subtropical Fern Gully Lagoon, using radiocarbon (14C) and …
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Factors affecting VA-mycorrhizal community structure in the Namib Dune Field: and the population biology of an ectomycorrhizal Basidiomycete: Suillus granulatus
… primarily structured by substrate stability and moisture availability. Five VAM species were found throughout the study area and were not host specific. Percent mycorrhizal colonization was correlated with moisture availability, whereas spore abundance was correlated with substrate stability. …
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Late Holocene diatom community responses to climate variability along the southern Cape coastal plain, South Africa
… changes and climatic fluctuations, in particular moisture availability. Alternatively, the Princessvlei system is governed by changes in nutrients and water turbidity, which have been shown to be proxies for moisture availability and wind. This makes moisture availability a primary controlling …
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The effect of altered rainfall seasonality on post-fire recovery of Fynbos and Renosterveld shrublands in the Cape Floristic Region
… Africa. I investigated vegetation sensitivity to moisture availability at multiple levels of detail including 1) productivity and community structure, 2) growth form responses and 3) physiological performance over three years. Post-fire rainfall patterns were manipulated by artificially increasing …
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Characterization of the impacts of the physiological response of vegetation to increasing levels of atmospheric carbon dioxide
… the physiological response to elevated CO2 and moisture availability was evident in simulations over Australia in summer. The influences of seasonality and moisture availability on the physiological response varied according to vegetation type where the influences are stronger over grass and …
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Responses of boreal vegetation to recent climate change
… demand in controlling changes in summer soil moisture availability and vegetation photosynthesis across extensive regions of the boreal zone, where vegetation growth is often assumed to be dominantly temperature-limited. Snow-mediated moisture controls of vegetation growth are particularly …
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The coupled development of terrain and vegetation : the case of semiarid grasslands
… semiarid landscapes organizes as a function of moisture availability, which is often mediated by the form of the land surface. Simultaneously the processes that shape the land surface are influenced by vegetation, mainly because vegetation reduces fluvial erosion. This thesis presents the study …
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Growth, water use efficiency and stable carbon isotopes in commercial clones of Eucalyptus
… This study investigated the effects of soil moisture availability on the growth and water use efficiency of 6 commercial clones of Eucalyptus commonly grown in South Africa with the aim of determining the following: (i) The extent of clonal variation in growth, dry mass allocation patterns, …
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Controls over the distribution of soil micro-invertebrates in the McMurdo Dry Valleys, Antarctica
… abiotic conditions, particularly low soil moisture, organic carbon availability, and high salinity. In this thesis I combine long-term ecological data with spatial habitat modeling to investigate the environmental drivers of micro-invertebrate distributions and predict future distributions …
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Investigation of Biotic and Abiotic Factors Affecting Double-Cropped Corn (Zea mays L.) Production in Virginia
… Response variables included yield, moisture at harvest, grain test weight, damage by European corn borer (Ostrinia nubilalis), damage by corn earworm (Heliothis zea), disease progress curves for gray leaf spot Cercospora zeae-maydis), and number of plants exhibiting virus symptoms. …
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Phytosociology and vegetation ecology of uMlalazi Nature Reserve
… such as, exposure to salt spray, salt content, moisture availability and clay content are important in shaping most of the communities in the study area. Differences in species richness, salt content, distance from the sea and human induced fire and grazing between plant communities are clearly …
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Regeneration of fire-adapted species in the Sierra Nevada contingent upon repeated fuel treatments and available soil moisture
… species. We found that post-treatment moisture availability (June-September and October-March precipitation) increased densities and occupancy probabilities, particularly after burning for all conifers. Treatments that excluded fire were most favorable for black oak seedling densities …
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Climatic and edaphic influences on the radial growth of eastern redcedar (Juniperus virginiana), Smoke Hole Canyon, West Virginia
… a single climatic variable (i.e. temperature or moisture availability) at the limits of their range. Individual trees, however, may be limited by one or more variables well within their ecological range. This can occur when individuals are located on ecologically extreme sites where soil moisture …
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An Evolutionary and Ecological Investigation into the Enigmatic Stalked Puffball Genus Tulostoma
… ornamentation and spore size are correlated with moisture availability, however comparisons between spore ornamentation and size and annual precipitation were not able to discern this pattern. Finally C:N isotopic ratios were evaluated to confirm the saprotrophic habit of Tulostoma species. These …
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Implications of the Dense City Centre to Surface-Atmosphere Exchanges
… Micro-scale anthropogenic sources of heat, moisture, and carbon dioxide are addressed by a new filtering technique for the processing of local-scale eddy covariance (EC) fluxes. <br/>Surface characteristics and anthropogenic activities influence the energy partitioning of sensible and latent …
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Geoarchaeology in semi-arid landscapes
… with periods of aridity as well as increased moisture availability, and that humans were not only present during these wetter periods. Geoarchaeology has been used to reconstruct the palaeoenvironmental conditions that humans had to navigate and adapt to, as well as to identify site formation …
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