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    The influence of spatial and temporal hydrologic variability on nutrient fluxes and transformations, San Pedro River, Arizona, USA

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    Author
    Klasner, Laura M.
    Issue Date
    2006
    Advisor
    Brooks, Paul D.
    
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    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Pre-monsoon (June) and monsoon (August) sampling campaigns were conducted on a gaining and a losing reach in the San Pedro River in 2005 to quantify the effects of variability in hydrologic conditions on carbon and nitrogen cycling in an N-limited semi arid stream. Nutrient concentrations decrease along the gaining reach, while new groundwater inputs, rapid N03-N uptake and net production of organic DOC and DON occurs. In contrast, the losing reach experiences little spatial variability suggesting the presence of a large, well-mixed alluvial aquifer as a single source. However, so/ concentrations and S04:Cl ratios decrease between gaining and losing systems with isotope mixing models indicating uptake of S04 2- and suggesting biological sulfate reduction between reaches. Diurnal cycles of increases in nighttime stage, er and nutrients indicate change in riparian vegetation transpiration demand and bank drainage of relatively N rich water at night. Monsoon stream flow becomes a roughly equal mixture of groundwater and monsoon precipitation with nutrient concentrations exhibiting little spatial variability. However, a decrease in DON concentrations and DON between the two reaches indicates nutrient processing occurs at much larger spatial scales. These data illustrate several examples of how hydro logic variability at different spatial and temporal scales controls nutrient fluxes and transformations.
    Type
    text
    Thesis-Reproduction (electronic)
    Degree Name
    M.S.
    Degree Level
    masters
    Degree Program
    Graduate College
    Hydrology and Water Resources
    Degree Grantor
    University of Arizona
    Collections
    Master's Theses

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