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Quantifying Soil And Groundwater Chemistry In Areas Invaded By Tamarix Spp. Along The Middle Rio Grande, New Mexico, Michelle Kelly Ohrtman
Quantifying Soil And Groundwater Chemistry In Areas Invaded By Tamarix Spp. Along The Middle Rio Grande, New Mexico, Michelle Kelly Ohrtman
Electronic Theses and Dissertations
Tamarix spp. (a.k.a. saltcedar, tamarisk) invasion is considered a major ecological threat at both national and global levels, with supposed impacts on soil and water chemistry. One of the most often cited mechanisms of ecosystem change by Tamarix is through its ability to deposit salty exudates and salt-rich leaf litter. The degree to which Tamarix relates to elevated soil and groundwater salinity, however, has not been adequately quantified, especially in the context of environmental factors that may also influence salinity. If Tamarix does elevate localized salinity by means of uptake, concentration and exudation by plant tissues, then we might expect …
Soil Amino Acids At Upper Tree Line, Montane And Lower Tree Line, Kelly C. Owens
Soil Amino Acids At Upper Tree Line, Montane And Lower Tree Line, Kelly C. Owens
Electronic Theses and Dissertations
The classic view of the nitrogen cycle in soils is for plants to take up inorganic N in solution for N nutrition. More recent studies reveal plants can take up low molecular weight dissolved organic N such as amino acids directly from the soil. In ecosystems where the rate of microbial mineralization is limited, plants may take up 10 to 200 percent more amino acid N than mineral N. It is not known if plants take up amino acids in all ecosystems, however recent research shows that plants generally take up amino acids when they are present in high quantities …