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 32 for “"soil composition"”.
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Plant genotype, immunity and soil composition control the rhizosphere microbiome
… sand and compost. Pots were inoculated with 10 % soil initially, and with 10% of growth medium from the previous generation in generations 2 and 3, keeping replicates separate for all three generations. The microbiome community structure of the plant rhizosphere in each generation was …
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Evaluation of Ecological Function of Urban Riparian and Stream Systems: Guiding Ecological Restoration in Austin, Texas, USA
… of a group of urban streams, leaf-litter decomposition was used as an integrated metric for assessing anthropogenic impacts. I measured leaf-litter decomposition rate with two species, Texas Red Oak (Quercus texana) and American Sycamore (Platanus occidentalis), as a response variable …
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Analysis of grounding performance for different bio filler medium effect
… and develop a new ground rod prototype with new soil composition. This new soil composition is used bio-material which then will be used as a main material for the grounding medium. The grounding rod will have a two design which is based on the previous research data. There is no any major or …
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Advancing Vegetation Monitoring Strategies in Arid Ecosystems Using Unmanned Aircraft Systems
… distributed and have heterogeneous species and soil composition. Unmanned Aircraft Systems (UAS) offer centimeter-scale spatial resolution and flexible deployment that can better address the scale of these communities. This work explores two complementary approaches for integrating UAS into …
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Do wetland characteristics, specifically plant communities, surface water, and soils play a significant role in whooping crane (<i>grus americana</i>) site selection?
… americana</em>) nest site selection; wetland soils, plant community structure and surface water quality were analyzed throughout nineteen established nest sites and twenty non-nesting wetland sites. Due to past fire management throughout the refuge, the effects of fire history were also …
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Mobile radiation sensor networks for source detection in a fluctuating background using geo-tagged count rate data
… by several reasons, such as the variation in soil composition, building materials, and weather patterns. In this thesis, a radiation sensor network is deployed, and a maximum likelihood estimation-based algorithm is developed to evaluate measurements from the sensor network and estimate the …
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Water Based Soil Fluidization using a Soft Eversion Robot
… abilities of underwater vine-like movement and soil fluidization, a process where granular materials are converted from a solid-like state to a fluid-like state, to create an underwater eversion robot capable of burrowing into sand. This was done with the goal of providing a future platform for …
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Environmental factors affecting the range expansion of Ixodes scapularis, the blacklegged tick, (Acari:Ixodidae) in Illinois
… presence and success of various animal hosts. Soil composition, elevation, and drainage may impact the survival and overwintering success of ticks. As part of the statewide surveillance program of ticks and their pathogens in Illinois during the autumn seasons of 2019 and 2020, a total of 283 …
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Using Geophysics To Evaluate Levee Stability
… of the Mississippi River. Field observation, soil samples, and geophysical data were collected at two field sites located on the border of Tate and Tunica County, MS. The first site consists of a developed shallow slough slide that had occurred that has not yet been repaired and the second …
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GEOTECHNICAL CHARACTERIZATION OF BALTIMORE DREDGED SEDIMENTS AS AN INFILTRATION BERM MATERIAL ON HIGHWAY SLOPES
… in common geotechnical construction due to its soil composition. It has low shear strength for foundation applications and lack of plasticity makes it an undesirable material for seepage barrier applications. Vegetated infiltration berms, used for regulating stormwater discharge, can be suitable …
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A study of planning and planning programs for rural counties in Virginia
… are: 1. Current population trends show both compositional and quantitative changes taking place in the rural counties of Virginia. 2. Land use development patterns in Virginia rural counties, under the present conditions, are wasteful and overtax the existing facilities. 3. Land usefulness …
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Distributional Modeling Of Rare Fishes And Mussels: From Ecological Theory To Biodiversity Conservation
… land use/land cover (LULC) pattern, LULC composition, soil composition, and geology composition. The study showed that LULC pattern metrics are very useful in modeling the distribution of Rabbitsfoot. Together with LULC compositional metrics, pattern metrics permitted a more detailed …
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Effects of soil texture, soil depth, and treatment on septic tank effluent renovation
This study compared the effects of soil texture, soil depth, and additional treatment, by constructed wetland (CW) and recirculating sand filter (RSF) systems, on wastewater renovation in a texture group 2 (loam) and a texture group 3 (clay loam) soil. The soils with depths of 15, 30, and 45 cm …
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Physical and Chemical Controls on Suffosion Development in Gypsic Soil, Culberson County, Texas
… through dissolution and transport of gypsic soils; however, no prior research has been conducted within the Delaware Basin in regard to these processes. These phenomena were evaluated in both field and laboratory settings in order to assess the parameters of suffosion development associated …
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Empirical approaches to the conservation of Margaritifera Margaritifera
… pearl mussel presence across Northern Ireland Soil composition and altitude may have a role in explaining the distribution of freshwater pearl mussels, as well as local habitat composition such as flow and bankside tree cover.<br/>Handling and attaching Passive Integrated Transponder tag to …
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Fire and periodical cicadas: impacts on soil nutrients and understory plant germination
… This study investigated the collective impact on soil composition and seed germination.</p> <p><strong>Methods </strong></p> <p>Through the soil analysis of cicada turrets, burned soil, and unburned soil, we hope to understand the composition of each soil type. Additionally, a 2 x 2 factorial …
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The Influence of Land Coverage and Soil Chemical Factors on Soil Bacterial Community Diversity and Structure in Cedartown, GA, USA
… due to their mobility and solubility in soil. Bacteria communities are vulnerable to heavy metal stress, but the response of different bacterial groups may vary depending on the level and type of heavy metal contamination. When subjected to heavy metal stress, many bacterial species or …
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Biodegradability of dicamba and 2,4-D in riparian wetland soils
A general review of soils in Virginia counties bordering the Chesapeake Bay reveals that coastal plain soils, especially those most agriculturally productive, are dominantly sandy texture in the subsurface horizon, and have shallow water tables. Considering the high amounts of pesticides used in …
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Environmental and economic tradeoffs in building materials production in India
… choice is heavily dependent on the local soil composition and industrial ecosystem. That is, there is likely not one answer to the question of which is better: traditional fired clay bricks (red bricks) or alternative, cementitious materials, and instead, decision making must be assisted …
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A comparison of soil characteristics in relation to success of a restored prairie
… plots. It was determined that differences in the soil composition may be the cause of the lack of success in Subarea 2C because it also had light soil color, higher clay content, and lower silt content compared to the other three permanent plots. This study attempts to determine the soil …
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