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.
Results
Showing 1 to 20 of 58 for “"soil cores"”.
-
The effects of land use, temperature and water level fluctuations on the emission of nitrous oxide (N2O), carbon dioxide (CO2) and methane (CH4) from organic soil cores in Iceland
Agricultural practices can affect soil microbial production and emission of the major greenhouse gases (GHG’s) nitrous oxide (N2O), carbon dioxide (CO2) and methane (CH4). The purpose of this study was to gain insight into the influence of temperature, water level and water level fluctuations on …
-
Restoration implications of land management on aboveground vegetation and seed bank composition of grassland communities in Illinois
… success. In 2009, vegetation surveys and soil cores were collected in July and October, respectively, for a total of 30 sites (five sites per land history) and 300 soil cores (10 cores per site). In 2010, soil cores then were grown in a greenhouse and the seedlings identified to species. …
-
Infiltration controls in a tallgrass prairie at a hillslope scale
Infiltration capacity influences the ability of a soil to absorb and transmit water through macropores and micropores of the soil structure. Infiltration is primarily influenced by the soil type, which is dependent on a number of factors including parent material, climate, biological activity, and …
-
ROTATION EFFECT OF PULSE CROPS ON NITROGEN FIXATION AND CARBON INPUT TO SOIL
… (BNF) and provide greater carbon (C) inputs to soil than non-pulse crops in rotation. The goal of this research was to estimate the BNF and C input to soil by various pulse crops (chickpea, lentil and field pea) grown in rotation with pulse crops and non-pulse crops. Soil cores from three crop …
-
DEPTH AND TIME RELATED VARIATIONS OF MICROBIAL COMMUNIITES IN AN EMERGENT FRESHWATER WETLAND
Soils, and the microbial communities contained within them, are vital for most chemical, physical, and biological processes. This study investigated how microbial community structure responded to environmental changes, such as hydrology, across vertical space (depth) and time in an emergent fresh …
-
Characterization of pathogen transport in overland flow
… of pathogens are controlled, in large part, by soil and vegetation. With an increasing number of concentrated animal operations, there is becoming a greater need to dispose of a vast amount of manure in a single, localized area. Animal manure contains a substantial amount of microbial pathogens, …
-
A Real -Time Core Extraction System for Soil Nitrates
… might be used in the field for the prediction of soil nitrates. This system used an intact core analysis, where an extracting solution was pushed through a soil core held between two filters, and an ion selective field effect transistor (ISFET) was used to sense soil nitrates in real time. Results …
-
Mycorrhizal fungus communities of Douglas-fir (Pseudotsuga menziesii) seedlings and trees: effects of proximity to residual trees
… from 1998 to 2000. Growth of seedlings potted in soils gathered near each residual tree was also examined in a greenhouse at the University of Washington. Monthly soil cores were collected near residual trees, and residual tree roots were sampled by partially excavating the root system. Colonized …
-
Comparing Newly Built Wetlands in the Atchafalaya Bay, Louisiana and Sacramento-San Joaquin Delta, California
… used to measure small changes in elevation, and soil cores were processed to examine mineral and organic contributions.</p> <p>Elevation change was highly variable, responding to influences from water level, river discharge, storms and vegetation. Mineral matter consistently added more to the …
-
NATURALLY ACIDIC OR ANTHROPOGENICALLY ACIDIFIED? UNCOVERING THE DRIVERS OF STREAM ACIDITY DURING STORMFLOW IN THE NEE SOON CATCHMENT, SINGAPORE
… and streamwater samples were analysed. Soil cores were collected for analysis of pH, particle size distribution, organic matter content, effective cation exchange capacity (ECEC) and base saturation (BS). During storm flow, all streams experienced a decrease in ANC as the concentration …
-
The effect of forest fertilization on the ectomycorrhizae of western hemlock (tsuga heterophylla)
… formed no mantle) were assessed using random soil cores taken at 0, 1, 3, 6, and 11months after fertilization. On both treated and control plots, total number of fine roots and number of basidiomycetousmycorrhizae remained constant while Cenococcum mycorrhizae decreased and those lacking …
-
Root growth of wheat genotypes in hydroponics and soil in relation to water stress tolerance and grain yield
… in hydroponic culture predicts root growth in soil, and whether root size is associated with grain yield and with tolerance to soil moisture stress. Differences in root fresh weight (RFW), shoot fresh weight (SFW), number of roots longer than 40 cm, longest root length, and total root length …
-
In situ carbon dioxide flux from Arctic tundra during freeze- up
The relationship between soil temperature and CO₂ flux from undisturbed soil cores was examined during freeze-up of arctic tundra. Three habitats which dominate tundra topography, polygon trough, ridge and basin, produced significantly different amounts of CO₂ when soil temperatures were above 0 C. …
-
Impact of mustards (Brassicaceae) grown as cover crops on non-target arthropod communities
… April, 10-12 June, 24-27 June, and 17-19 July. Soil samples were collected in 2008 on 18 April, 02 June (1 week after planting of mustards), 29 June (shortly before incorporation of mustards), 18 July (2 weeks after incorporation of mustards), and 11 September and in 2009 on 25 May. A total of …
-
Gross N turnover and soil solution chemistry as influenced by fluctuations of soil water potential and water table in a Podzol and a fen soil
… higher frequency of drying/rewetting cycles of soils in the future can be expected. These changes of the meteorological conditions likely result in an increasing frequent and intensive drought periods in summer, causing irregular and extreme drought stress in forest soils or a drawdown of water …
-
Comparison of Soil Bulk Density After Poultry Litter Application
… the effects of poultry litter application on soil bulk density. A randomized split block design was used for this study. The soil was a Crider silt loam (Typic Paleudalf). Poultry litter treatments were compared with inorganic fertilizers. The same basic fertility treatments were applied in …
-
Interactions between human industry and woodland ecology in the South Pennines
… from excavated burning platforms, palynology of soil cores, tree ring analysis and ecological survey. This was set within a historical context, particularly focusing on the regional industries of iron, leather and textiles, in order to understand the economic motivations for changes in woodland …
-
The Persistence of Acid Mine Drainage at an East Texas Coal Mine
… laboratory setting. Leaching was conducted on soil cores obtained from the vadose zone at Oak Hill Mine and the humidity cell was used to accelerate oxidation of the pyrite within the cores.</p> <p> An in-situ field study was also conducted that monitored groundwater conditions monthly to …
-
A study of the relationship between environmental conditions and salt marsh zonation at Langebaan Lagoon
… Sample sites were allocated to the transects and soil cores were extracted for the testing of a comprehensive range of edaphic factors. The results of these tests are graphically displayed to demonstrate the existence of environmental gradients, and these gradients are then linked to specific …
-
The hydrogeochemistry of pond and rice field recharge : implications for the arsenic contaminated aquifers in Bangladesh
… of a sensor network to continually monitor soil moisture and water potential, tracer tests to visualize flow patterns, soil cores to determine soil properties, and soil and water samples to ascertain chemical characteristics. The large amount of generated data were synthesized with …
Page 1 of 3