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 85 for “"root biomass"”.
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Coarse Root Biomass and Architecture: Applications of Ground Penetrating Radar
… radar (GPR) to identify and quantify coarse roots was tested in a mixed-oak forest in Southeastern Virginia using experimental pits and locally excavated root segments. GPR was found to be highly dependent on low soil moisture levels as it is unable to differentiate root structures if they …
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The impact of plant root biomass on the biodegradation and bioaccessibility of hydrocarbons in soil
… thesis was to investigate the impact of plant root biomass and components typically found within root exudates on the biodegradation and bioaccessibility of phenanthrene from soil with particular interest in the study of root-induced changes of hydrocarbon bioaccessibility. Results showed that …
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Effects of 11 Years of CO2 Enrichment on Root Biomass and Spatial Distribution in a Florida Scrub-Oak Ecosystem
… radar (GPR) were used to measure fine root (< 2 mm diameter) and coarse root (> 5 mm diameter) biomass, respectively. After 11 years of CO<sub>2</sub> enrichment, there was a trend of greater total root biomass under elevated CO<sub>2</sub>. Fine root biomass exhibited a pattern of …
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Investigating population dynamics of Hoplolaimus galeatus and select associated relationships in creeping bentgrass putting greens
… nematode populations and creeping bentgrass root biomass using inoculated nematode populations and varying levels of nitrogen to promote root growth. Increased nematode populations reduced root biomass (r= -0.56322), though increasing nitrogen inputs led to higher nematode counts without …
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The Evaluation of Root System Architecture (RSA) As A New Breeding Target for Climate-Resilient Winter Wheat (Tritium aestivum L.)
… for plant breeders to shift their focus to the root system architecture (RSA) as a new target for indirect selection, enabled by the phenotypic plasticity of winter wheat (Triticum sp.), one of the main staple agronomic crops. Our current limited understanding of the dynamic nature of the root …
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Quantitative Trait Loci Associated with Waterlogging Tolerance in a Soft Red Winter Wheat Mapping Population
… was determined by quantifying fresh shoot biomass, fresh root biomass, dry shoot biomass, dry root biomass, root length, chlorophyll content, tiller number, elongation, and plant height pre and post-treatment under stressed and non-stressed conditions.</p> <p>In both the greenhouse and the …
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Grass root gaps : an establishment bottleneck limits trees in savannas and excludes them in South Africa's highveld grasslands
… from surviving. It was hypothesized that grass root competition for space eliminates the availability of suitable 'gaps' for tree establishment under high rainfall conditions. Demographic bottlenecks on Acacia species populations were determined by examining the ratio of juvenile plants to adult …
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Soil Carbon Dioxide Efflux in Response to Fertilization and Mulching Treatments in a Two-Year-Old Loblolly Pine (Pinus taeda L.) Plantation in the Virginia Piedmont
… resulting from soil microbial activity and root respiration is one of the major components of the total carbon flux in forested ecosystems. In an effort to examine the response of soil carbon dioxide efflux to changes in soil factors, nutrient availability, temperature, and moisture, soil …
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Root growth potential and weed control effects on the first year growth of pitch x loblolly pine (Pinus ridiga x P. taeda L.) and loblolly pine
… and westvaco loblolly pine (WCO-Iob). Lateral roots had the greatest response to the Oust treatment compared to all other seedling parts. All seedlot and treatment interactions were associated with lateral roots. After one growing season the Oust treatment resulted in a 148% increase in lateral …
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Use of strigolactone for stress relief and increased productivity in high-yielding environments
… in the regulation of shoot inhibition and root growth and development. The objective of this study was to determine the ability of a strigolactone to increase the grain yield of corn (Zea mays L) in combination with varying levels of crop management. This study was conducted in Champaign, …
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Bioremediation of arsenic and cadmium in a Populus tremula x Populus alba mutant
… rate, enhanced pest resistance and a predicted root phenotype was investigated for its ability to tolerate and accumulate arsenic and cadmium in soil. The chlorophyll, hydrogen peroxide and proline contents of fuzzy tissues were assayed, its tissue metal content was measured using ICP-MS and its …
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The Effect of Complete Vineyard Floor Ground Covers and Root Pruning on Cabernet Sauvignon
Complete vineyard floor cover cropping and root pruning (RP) were evaluated for their ability to regulate excessive vegetative growth and improve berry and wine composition of ‘Cabernet Sauvignon’ (Vitis vinifera L.). Treatments were: tall fescue (Festuca arundinacea Shreb.) ‘KY-31’ and ‘Elite II’, …
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Quantification and Physiology of Carbon Dynamics in Intensively Managed Loblolly Pine (Pinus taeda L.)
… (1) investigating environmental, soil C, root, and stand influences on soil CO2 efflux on the South Carolina coastal plain and (2) quantifying soil CO2 efflux over a rotation in loblolly pine stands located on the South Carolina coastal plain and the Virginia piedmont. In relation to the …
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Evaluating rhizodegradation of petroleum hydrocarbons and polycyclic aromatic hydrocarbons in wetland sediments containing spartina patens
… PAH, microbial density, nutrients, pH, redox and root biomass at 2.5 and 7.5 cm in sediments with <12% PHC. The sediments contained on average 6.5% to 9.5% PHC and 56 to 124 parts per million (ppm) total PAH. The plants exhibited a 95% survival rate and added from 1% to 2% root biomass to the …
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Greenhouse gas fluxes and root productivity in a switchgrass and loblolly pine intercropping system for bioenergy production
… and switchgrass. RS is primarily the result of root respiration (RA) and microbial decomposition of organic matter (RH) releasing CO₂ as a by-product and is an important and large part of the global carbon (C) cycle. Accurate estimates of the two components of total soil respiration (RS) are …
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Growth responses of nine provenances of Pinus brutia Ten. (Turkish red pine) to different levels of herbaceous competition and soil water
… Diameter and secondary needle, stem, and root biomass were measured at the end of the second growing season, while height was measured after both the first and second growing seasons. Pine stem water potential (SWP), measured at the end of the second growing season, was the only …
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Genetic analysis of cowpea (Vigna unguiculata L. WALP) agronomic variables in phosphorus limiting soil.
… set were for pod length (h2= 0.35) and root biomass (h2= 0.28) while in the control set the variable yield (h2= 0.72) had the highest score. Variables plant biomass, root biomass, number of pods and pod length were identified as ideal at discriminating genotypic performance responses in …
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Genetic analysis of cowpea (Vigna unguiculata L. WALP) agronomic variables in phosphorus limiting soil.
… set were for pod length (h2= 0.35) and root biomass (h2= 0.28) while in the control set the variable yield (h2= 0.72) had the highest score. Variables plant biomass, root biomass, number of pods and pod length were identified as ideal at discriminating genotypic performance responses in …
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The effect of bush clearing on soil respiration in north-central Namibia: Cheetah conservation fund and Erichsfelde
… to an equal amount of soil respiration between root respiration (as a result of high root biomass of woody vegetation) in the uncleared site and microbial respiration from increased litter decomposition together with root respiration of grass and herbaceous plants in the cleared site. On the …
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