Estimating the net flux of nutrients between a salt marsh and a tidal creek |
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Authors: | John D. Spurrier Björn Kjerfve |
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Affiliation: | 1. Department of Statistics Belle W. Baruch Institute for Marine Biology and Coastal Research, University of South Carolina, 29208, Columbia, South Carolina 2. Department of Geological Sciences Marine Science Program Belle W. Baruch Institute for Marine Biology and Coastal Research, University of South Carolina, 29208, Columbia, South Carolina
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Abstract: | Statistical aspects of estimating net fluxes of nutrients between a salt marsh and a tidal creek on a tidal cycle basis and an annual basis are explored. For individual tidal cycles, the instantaneous flux of a nutrient is written in a constrained linear model as a function of time. The model is rewritten as an unconstrained model, and net flux is shown to be a linear combination of the parameters of the model. Standard linear models techniques can be used to make inferences about net fluxes on a tidal cycle basis. Considering a year as a finite population of tidal cycles, annual net flux can be estimated using a regression estimator. In the case of the flux of dissolved nitrite plus nitrate, the marsh was found to be a statistically significant sink for nitrogen (in this form) from adjacent tidal creeks. |
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