Solute geochemical mass-balances and mineral weathering rates in small watersheds II: Biomass nutrient uptake,more equations in more unknowns,and land use/land cover effects |
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| Authors: | Jason R Price Christopher R Hardy Karen Sue Tefend David W Szymanski |
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| Institution: | 1. Department of Earth Sciences, P.O. Box 1002, Millersville University, Millersville, PA 17551-0302, USA;2. James C. Parks Herbarium, Department of Biology, P.O. Box 1002, Millersville University, Millersville, PA 17551-0302, USA;3. Department of Geosciences, 1601 Maple Street, University of West Georgia, Carrollton, GA 30118, USA;4. Department of Geological Sciences, 206 Natural Science Building, Michigan State University, East Lansing, MI 48824-1115, USA |
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| Abstract: | Paired watersheds are used to develop a deciduous nutrient uptake stoichiometry. The watersheds are those of the House Rock Run and the Brubaker Run located in the Pennsylvania Appalachian Piedmont, USA. These two watersheds are nearly identical with respect to bedrock, regolith, climate, geomorphology, morphometry, baseflow hydrology, and type and successional stage of forest vegetation. They only differ by the percentage of deciduous forest cover, with House Rock Run having 59% and Brubaker Run having 76%. From differences in their stream chemistries the biomass nutrient uptake stoichiometry of K1.0Mg1.0Ca1.4 was determined. This stoichiometry applies to an aggrading deciduous biomass and differs from those previously used which were derived from net primary production (NPP) data. The difference may reflect that macronutrients in plant tissue may also originate from atmospheric inputs and/or decomposing biomass. Although this stoichiometry may not be applied to all deciduous forest-covered watersheds, it is likely an improvement over a stoichiometry determined from NPP data. |
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