Abstract
Denitrification dynamics in “geographically isolated wetlands” (GIWs) may provide a link between GIWs and aquatic systems by converting N to other end products (e.g., N2, N2O, etc.), protecting downstream waters from excessive N. We compared GIW ambient and amended denitrification rates and soil/water covariate relationships in areas of two ecoregions. The average unamended denitrification rate was 6.89 ± 5.02 (range: 1.67–18.91) μg N kg DW−1 (dry weight) hr−1, and no ecoregional differences were found. Areal calculations were 0.010–0.356 g N m−2 day−1. Carbon amended denitrification samples decreased −18 %, while samples amended with N or N + C averaged 2730–3675 % above background levels; N + C rates were tested and did not differ between ecoregions. DW denitrification rates were correlated with soil covariates NH4, %N, and %C while ash-free DW samples were also correlated with soil TP and water TN. A tree-based classification grouped GIWs based on soil NH4 values, though the results were not conclusive. The findings suggest that GIWs embedded in areas with substantial loadings of N and P and ample C (e.g., agricultural land uses) may limit exposure of other waters to N pollution.
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Acknowledgments
We acknowledge Brian Hill for providing laboratory assistance, John Marton for sharing his recent papers, and Peter Myers of Osceola National Forest, Pat Tooley of Ocala National Forest, and Lee Thornhill of Croatan National Forest for providing site access. We thank Amy Prues for making Fig. 1. Jake Beaulieu, Rose Kwok, and two anonymous reviewers provided valuable feedback to improve this manuscript. This paper has been reviewed in accordance with the U.S. Environmental Protection Agency’s peer and administrative review policies and approved for publication. Mention of trade names or commercial products does not constitute endorsement or recommendation for use. Statements in this publication reflect the authors’ professional views and opinions and should not be construed to represent any determination or policy of the U.S. Environmental Protection Agency.
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Lane, C.R., Autrey, B.C., Jicha, T. et al. Denitrification Potential in Geographically Isolated Wetlands of North Carolina and Florida, USA. Wetlands 35, 459–471 (2015). https://doi.org/10.1007/s13157-015-0633-7
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DOI: https://doi.org/10.1007/s13157-015-0633-7