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 15 of 15 for “"soil community"”.
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Soil community structure and litter decomposition under irrigated Eucalyptus Globulus in South Western Australia
… the potential to ameliorate salinity and soil erosion, enhance biodiversity, and provide timber and wood chips. They are increasingly important because of their role in carbon sequestration (Adolphson, 2000; Anonymous, 2005; Jones et al. , 2005; Kozlowski, 2002; Paul and Polglase, 2004). …
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The Effects of Rootstock Selection and Carbon-based Fertility Amendments on Apple Orchard Productivity and Soil Community Ecology
… Borkh.) orchards, rootstock genotype, and soil fertility management practices impact soil fertility, plant associated soil microbial communities, and orchard productivity. Apple growers select rootstocks to confer beneficial traits, including size control, precocity, and pest and disease …
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Investigations of Bromus tectorum: restoration strategies and interactions with arbuscular mycorrhizal fungi
… compared mycorrhizal inoculum potential of field soils from beneath native plants surrounded by B. tectorum and the same species surrounded by native vegetation. I found that B. tectorum was associated with diminished AMF. Next I tested responses of two native plant species when grown in soils …
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A Paleosol-Derived Environmental Perspective on MIS 3 in the Central Great Plains
… plume the GCF supported a moderately active soil community dominated by C4 grass prairies, suggesting a warm fairly dry climate prevailed during most of MIS 3.
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Interactions between nematodes, potato and soil-borne micro-organisms and their effect on the management of potato cyst nematodes
… elucidate the complex tritrophic PCNpotato-soil bacteria relationship. Bacterial strains isolated from the sugar beet rhizosphere were shown to be hatch active towards Globodera pallida and to be capable of successfully colonising the sugar beet rhizosphere when applied exogenously. A …
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Natural transformation and growth inhibition of azotobacter vinelandii in the presence of adsorbed oxytetracycline
… antimicrobials are introduced to agricultural soil through land application of manure. Both can persist in the environment if adsorbed to soil grains, allowing potential for increased antimicrobial resistance in the soil microbial community. Oxytetracycline (OTC) is a commonly used …
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Impacts of inundation and season on greenhouse gas fluxes from a low-order floodplain
… and methane (CH4), are produced naturally in the soil during the metabolism of many soil microbial and plant communities. The generation rate of GHGs depends on many factors, including soil community composition, nutrient availability, temperature, and soil moisture. Predicted climate variability …
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Change in the Structure of Soil Microbial Communities in Response to Waste Amendments
Soil microbial communities are affected extensively by addition of amendments to their environment. Of particular concern is the addition of poultry litter, which contains a substantial C, energy, and nutrient supply, but also antibiotic resistance genes (ARG), antimicrobials, and a multitude of …
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Interactive Effects of Cover Crops, Invertebrate Communities and Soil Health in Corn Production Systems
… on a systems level. Encouraging biodiversity and soil health is the goal of many agricultural practices used in regenerative farming; regenerative systems employ practices which abide by the two main principles of increasing biodiversity and decreasing disturbance, with the goal of encouraging …
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Targeted short-term nutrient reduction to manage Ventenata dubia an invasive winter annual grass: soil and plant responses
… also reduce native plant diversity and harm the soil microbiome. These effects require additional measures to be taken, like reseeding, and plant diversity is still usually well below remnant targets. Early season short-term nutrient reduction to manage IWAGs is largely unexplored and would …
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Bioaugmentation with metal-resistance microorganisms in the remediation of metal and organic contaminated soils
… of the first study was to compare the microbial community response to cadmium exposure between metal-contaminated and uncontaminated soils. This study found that while cadmium adversely affected the numbers of culturable microorganisms in all soils, cadmium-resistant isolates were found in each …
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Understanding polycyclic aromatic hydrocarbon degradation by soil microbial communites: the concentration and distribution of aromatic dioxygenase genes
… deposition of PAHs influences the development of soil microbiological communities, creating selective pressure for the development of microbial communities able to survive. To confirm that the mineralization of PAHs correlates with gene copy number, 14C radiorespireometery was used to detect the …
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Ecological assessments of Pseudomonas communities in pastoral soils: implications for disease suppression and sustainable production in agricultural grasslands
… services such as ensuring water quality and soil carbon storage. An increasing proportion of grasslands are being used to support grazing livestock, with agricultural grasslands covering over 25% of the Earth’s ice-free land surface. Despite the increasing economic value of pasture-derived …
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Distribution of nematodes in pasture soil across seasons and in combination with plant species and fertiliser application
… climatic characteristics can influence the soil biodiversity and soil functions in a pastoral system. Pasture soils have unique systems with different soil faunal and microbial communities, including soil-dwelling nematodes and plant species composition. Nematodes have the potential to be …
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Metagenomanalyse eines hydrolytischen Konsortiums: Identifizierung und biochemische Charakterisierung von Polysaccharid-abbauenden Biokatalysatoren aus nicht kultivierten Mikroorganismen
Die Durchmusterung von Umweltgenbanken hat sich in den letzten Jahren als effektive Technik erwiesen, auf den stetig wachsenden Bedarf der Industrie an neuen Biokatalysatoren zu reagieren. Im Rahmen dieser Arbeit wurde eine Umwelt-Genbank eines Boden-Konsortiums durch die Kombination …