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 99 for “"microbial biomass"”.
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Chemical and Degradation Characteristics of Soil Microbial Biomass
… to SOM. However, the contribution of soil microbial biomass to carbon-cycling is seriously underestimated and its turnover poorly understood. To address these knowledge gaps, a study utilizing 13C and 15N isotopically enriched soil microbial biomass was undertaken to determine the …
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Factors controlling microbial biomass in soils of Mt. Kilimanjaro
… In general, high contents in organic and microbial carbon (Corg, Cmic) are related to high soil fertility. Especially in the tropics, climate and land use have strong direct effects on basic soil parameters and soil microbial biomass. Furthermore, alterations of the basic soil parameters …
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Quantification of total microbial biomass and metabolic activity in subsurface sediments
Metabolically active microbial communities are present in a wide range of subsurface environments. Techniques like enumeration of microbial cells, activity measurements with radiotracer assays and the analysis of porewater constituents are currently being used to explore the subsurface biosphere, …
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Historical contingency and priority effects impact the decomposition of dead microbial biomass
Differences in species arrival order can significantly impact both the structure and functioning of ecological communities. These so-called ‘priority effects’ can occur when the early arriving species modify their environment to make it more or less suitable for subsequent colonizers (i.e., niche …
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Estimation of microbial biomass in natural and perturbated tundra by the ATP bioluminescence assay
… tundra soil was found to contain sufficient microbial biomass for decomposition indicating that the slow decomposition of the tundra may be due to inhibited metabolic activity. Samples were collected from the International Biological Program Tundra Biome site at Barrow, Alaska and analyzed …
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Biosynthesis of Utilizable Microbial Biomass in the Treatment of Milk Wastes in High-Rate Filters
The feasibility of producing utilizable microbial biomass while treating dairy wastes in a pilot-scale high-rate Flocor tower was examined. The literature on different methods of utilizing organic wastes and on the growth and control of fungi in bacteria beds was reviewed. A survey of dairies using …
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The effects of light level and temperature on freshwater microbial biomass, production, enzyme activity, and community composition
… microbes to assess these effects. Heterotrophic microbial production was greater in the presence of light, as were some periphytic enzyme activities. Few response variables increased in a near-linear fashion with ascending temperature, suggesting different temperature optima. The strength of …
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Modeling Departures From Abiotic Expectations During the Calcium Carbonate Precipitation Process
… rate is more than twice that determined when microbial biomass on the aragonite mineral surface is depleted by 0.2 mum filtration; and (2) inhibiting microbial viability with UV irradiation has no significant effect on the mean precipitation rate. Kinetic modeling of the CaCO3 precipitation …
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Seasonal, biogeochemical, and microbial response of soils to simultaneous warming and nitrogen additions
… environmental threats that could alter soil microbial communities and the biogeochemical processes they perform. Few studies have examined interactive effects of elevated temperatures and nitrogen inputs. Many studies have also not considered the role that season plays in mediating the …
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Organic carbon and fertility of forest soils on the Allegheny Plateau of West Virginia
… sampled and analyzed for soil organic and soil microbial biomass carbon as well as various fertility parameters. Additionally, vegetative biomass estimates were made at the sampling sites. The soil series sampled (established and tentative) are frigid, well and moderately-well drained …
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Soil microbial community dynamics in response to cover crop implementation and P fertilizer management
… (N) soil health metrics; (ii) to explore the microbial community structure using phospholipid fatty acid analysis, and (iii) to identify key microbial functional gene composition, and soil health metrics relate to key soil microbial functional gene composition in the fall 2019 and spring 2020 …
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Carbon and nitrogen mineralization in temperate forest soils at low temperatures
… importance as the temperature dependency of microbial processes is enhanced at low temperatures. Besides microbial parameters, substrate availability and quality are known to influence the temperature dependency of decomposition. Around freezing point, soil frost may also affect the soil …
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Soil organic matter dynamics in a temperate forest influenced by extreme weather events
… phospholipid fatty acids (PLFA) as measure for microbial biomass. Amounts of lignin contents were not significantly affected by repeated freeze/thaw cycles. However, intensive frost slightly enhanced lignin mobilization in the O layer and the translocation into the B horizon. While soil frost …
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Effect of aqueous neem(Azdirachta Indica A Juss) leaf extract on selected soil chemical and biological properties
… was incubated for 7 days and analysed for soil microbial biomass and activity using the Chloroform Fumigation and Incubation (CFI) method and soil respiration method, respectively. Neem leaves used for making the extract had 2.58, 1.77, 1.5, 0.4 and 0.1 % of Ca, K, N, Mg and P respectively. …
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Effect of aqueous neem(Azdirachta Indica A Juss) leaf extract on selected soil chemical and biological properties
… was incubated for 7 days and analysed for soil microbial biomass and activity using the Chloroform Fumigation and Incubation (CFI) method and soil respiration method, respectively. Neem leaves used for making the extract had 2.58, 1.77, 1.5, 0.4 and 0.1 % of Ca, K, N, Mg and P respectively. …
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Evaluation of Topsoil Substitutes for Restoration of Appalachian Hardwoods on Strip Mined Land
… as well as herbaceous plant occurrence and microbial biomass and activity. Three mine spoils, brown, weathered sandstone (BWS), white, unweathered sandstone (WUS), and gray, unweathered shale (GUH) were compared with undisturbed forest topsoil (UFT) to determine their suitability for tree …
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The Influence of Switchgrass Establishment on Soil Organic Matter Pools in an Agricultural Landscape
… three particulate organic matter fractions, root biomass, mineralizable carbon and nitrogen pools, and microbial biomass. Surprisingly, I observed significant declines in bulk soil organic matter and surface particulate organic matter pools following switchgrass establishment. There were no …
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