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- Atacama Desert (1)
- Bare soils (1)
- Chile (1)
- Chloride distribution (1)
- Chloride mass balance (1)
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- Chloride transport (1)
- Eldorado Valley (1)
- Hydrology (1)
- Hyperarid soils (1)
- Micro-topography (1)
- Nevada (1)
- Normalized Difference Vegetation Index (NDVI) (1)
- Patterned ground (1)
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- Plant canopies (1)
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- Root uptake (1)
- Root zones (1)
- Saline soils (1)
- Salt minerals (1)
- Soil analysis (1)
- Soil contaminates (1)
- Soil moisture (1)
- Soil sample preservation (1)
- Solid-phase microextraction (SPME) sample preparation technique (1)
- South Florida (1)
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- Tropical Rainfall Measuring Mission Precipitation Radar (TRMMPR) (1)
- Volatile organic compounds (VOCs) (1)
- Water monitoring (1)
Articles 1 - 4 of 4
Full-Text Articles in Earth Sciences
Effects Of Plant Uptake And Micro-Topography On Chloride Transport In Arid Soils, Wenming Nie
Effects Of Plant Uptake And Micro-Topography On Chloride Transport In Arid Soils, Wenming Nie
UNLV Theses, Dissertations, Professional Papers, and Capstones
Chloride concentration profiles to depths of 1 m were evaluated on a young alluvial fan in Eldorado Valley, NV. It was found that chloride beneath plant canopies were 11 to 222 times higher than adjacent (1 - 2 m away) bare soil locations. Two-dimensional numerical simulations using HYDRUS 2D/3D model were used to further explore the impact of plants on chloride transport. The simulation results indicated that lateral flow driven by root uptake concentrated chloride toward root zones, leading to the accumulation of chloride under plant canopies. Results also suggest that locally micro-topography can have a substantial impact on chloride …
Mineralogy And Micromorphology Of An Atacama Desert Soil, Chile: A Model For Hyperarid Pedogenesis, Michael S. Howell
Mineralogy And Micromorphology Of An Atacama Desert Soil, Chile: A Model For Hyperarid Pedogenesis, Michael S. Howell
UNLV Theses, Dissertations, Professional Papers, and Capstones
The Atacama Desert is the oldest and driest desert on Earth. Hyperarid soils in this desert are dominated by rare (or exclusive) salt minerals and assemblages. Previous research details salt origins and abundance, however pedogenic processes involved in salt distribution are not adequately explained. Therefore, the main goal of this investigation was to identify and document evidence for hyperarid pedogenesis (via salt mineralogy and soil micromorphology) at a field site, Oficina Ercilla, located ~80 km northeast of Antofagasta, Chile within the Central Depression and hyperarid core of the Atacama Desert. This study presents an interpretational model for hyperarid pedogenesis, which …
Analytical Method Development For Determination Of Volatile Organic Compounds In Calcareous Desert Soil, Mary F. Turner
Analytical Method Development For Determination Of Volatile Organic Compounds In Calcareous Desert Soil, Mary F. Turner
UNLV Theses, Dissertations, Professional Papers, and Capstones
Soil sample preservation for volatile organic compound analysis generally requires short sample holding times or preservation of the sample's chemical constituents with sodium bisulfate (NaHSO 4 ). Calcareous soils cannot be preserved using NaHSO4 because effervescence will promote the loss of analytes, and short holding times before analysis are not practical for remote sampling locations. An experimental approach was developed for determination of volatile organic compounds (VOCs) in soil that utilizes solid sorbents for sample preservation and solid-phase microextraction (SPME) sample preparation technique coupled with gas chromatography/mass spectrometry (GC/MS) for analysis. Solid sorbents are used to sequester readily extractable (vapor …
Soil Moisture And Water Stage Estimation Using Precipitation Radar, Sumit Puri
Soil Moisture And Water Stage Estimation Using Precipitation Radar, Sumit Puri
UNLV Theses, Dissertations, Professional Papers, and Capstones
In south-western United States, soil moisture data is important for drought studies in the region which is experiencing a drought for many years, whereas in South Florida, water stage data is required by hydrologists to monitor the hydrological flow in wetlands. Soil moisture data and water stage data are not sufficiently available due to sparse monitoring stations. Installation of dense measuring stations over an extended area is costly and labor intensive. Therefore, there is a need to develop an alternative method of measuring soil moisture and water stage. Microwave remote sensing has proven to be a useful tool in the …