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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 21 for “"soil nutrient availability"”.
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Influence of Poultry Litter on Dark Tobacco Growth and Soil Nutrient Availability
… fertilizers increase the osmotic pressure of the soil solution and soil acidity, often causing reduced stands, Mn toxicity, Mo and Ca deficiencies, and reduced yield and quality of the cured leaf (Sims et al., 1984). Poultry litter utilized as a nutrient source is an inexpensive alternative to …
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The effect of soil nutrient availability on resource allocation in tropical tree species
… strategies for resource use and acquisition. Soil resources influence productivity of tropical forests and the distributions of tree species across edaphically heterogeneous landscapes. My dissertation evaluates functional variation among tropical trees in nutrient use, and the implications of …
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Factors affecting soil nutrient availability and its impact on maize and soybean productivity
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-09-16 without embargo terms
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Effects of soil nutrient availability on the development of tropical monodominance and subordinate species composition in montane forests
… achieves high abundance. The study assessed soil properties along with species composition using a paired plot design consisting of mixed forest and nearby Oreomunnea-dominated forest sampled at four sites in montane forest in western Panama. We found support for the “ecosystem modification” …
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Integrating the effects of climate change and caribou herbivory on vegetation community structure in low Arctic tundra
… its effects on permafrost degradation and nutrient cycling, and to cause positive feedbacks to global climate change through its impacts on carbon balance and albedo. Experimental evidence indicates that tundra plant growth is most strongly limited by soil nutrient availability, which is …
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An Experimental Assessment of Soil-Based Habitat Partitioning in Understory Palms
Soil nutrient and water availability can shape plant communities by influencing species composition and the functional traits that allow species to regenerate, grow and reproduce. My dissertation research established patterns of understory palm community assembly and functional traits in relation …
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Will Nitrogen fixers benefit from rising Atmospheric CO2? The response of Podalyria Sericea to elevated CO2
… effect of restricted root growth and low soil nutrient availability are discussed as additional factors which may have negated a positive growth response.
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Improved Management of Acid Sulfate Soils for Rice Production in Casamance, Senegal
… rice is primarily produced, have acid sulfate soils with low pH and potential aluminum and iron toxicity. The goal of this work was to determine if soil amendments can alleviate soil acidity, counteract the negative biogeochemical effects that occur in flooded conditions, and increase rice …
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Factors affecting root system response to nutrient heterogeneity in forested wetland ecosystems
Soil nutrients are often heterogeneously distributed in space and time at scales relevant to individual plants, and plants can respond by selectively proliferating their roots within nutrient-rich patches. However, many environmental factors may increase or decrease the degree of root proliferation …
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The effects of fire and drought on plant-soil feedbacks of a nonnative invasive grass in southern Illinois
… their dominance over native species by altering soil nutrient availability (i.e. resource-mediated feedbacks) and by modifying fire regimes (i.e. disturbance-mediated feedbacks). While fire and other disturbances are shown to promote further invasions, there is a limited understanding of their …
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Influence of soil water regime on nitrogen availability and plant competition in wet meadows
… in wet meadows include site hydrology, soil nutrient availability and grazing. Of these, depth and annual variation of the water table has been considered as a primary factor and been frequently used in management decisions. A mechanistic understanding of how water regime influences …
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The Influence of Dense Understory Shrubs on the Ecology of Canopy Tree Recruitment in Southern Appalachian Forests
… and survivorship of Quercus seedlings, resource availability, and the rates / causes of seedling damage. I found that neither seed rain, nor seed bank density or species richness was inhibited by the presence of R. maximum or K. latifolia. Forest seed banks were dominated by sweet birch (Betula …
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Enhancing mineral nutrient availability and corn productivity with biostimulants
… population, nitrogen fertility, additional nutrient fertility, and foliar protection (Ruffo et al., 2015). In recent years, a new technology has been discussed, namely, biological products. These products have a wide variety of uses but are typically intended to increase crop growth, relieve …
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Environmental Controls on Foliar Respiration in Arctic Plants
… amounts of carbon stored in the vegetation and soils of the tundra. Foliar gas exchange, which is responsible for the initial fixation of carbon, is likely to respond to warming and associated environmental change in tundra plants, though the direction and degree of these responses are not well …
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Aspects of the biology of climbers in southern Africa
… plants (climbers) was established over a soil nutrient gradient, under standardised light conditions. Abundance was found to be positively correlated with the potassium concentration and the soil S-value, but not with other nutrients. Thus, the association between climbers and soil …
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Functional analysis of Poplar genes regulating flowering and vegetative growth
… bud set compared to the WT plants under low soil nutrient conditions. Wood chemistry data analysis of field grown AmiSND2 trees showed that they have a significantly higher cellulose content a lower lignin content compared to that of the WT. Thus, these results show that downregulating the …
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Impacts of Fertilization on Soil Properties in Loblolly Pine Plantations in the Southeastern United States
… applications on the O horizon and mineral soil in loblolly pine (Pinus taeda L.) plantations over a 12-year period. To accomplish this, we used 9 experimental sites located across the south, which were grouped using the CRIFF Classification System. Group 1—CRIFF A, B (poorly-drained …
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Herbivore-plant-soil interactions in the boreal forest : selective winter feeding by spruce grouse
… is rapid relative to spruce litter. In the nutrient limited boreal forest, spruce grouse faecal inputs under feeding trees may locally increase soil nutrient availability and nutrient cycling rates (Chapter 4). The nitrogen content of grouse faeces may account for the relatively high growth …
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Soil properties, lime and phosphorus fertiliser management affecting grass production in Ireland
<p class="MsoNormal">Phosphorus (P) is a macro nutrient and is an essential element required by grasslands for optimum production and herbage P concentration for animal dietary requirements. However phosphorus is a finite resource and efforts must be made to reduce P needs in grassland to prolong …
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Structure and function of western red cedar and western hemlock forests on northern Vancouver Island
… relationship with geology, topography or mineral soil. However, seedlings regenerated following cutting on the two types exhibit large differences in growth. Seedlings on cutovers in the CH type grow slowly and have symptoms of nutrient defiency; those in the HA type grow relatively rapidly with …
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