Denitrification Potential in Geographically Isolated Wetlands of North Carolina and Florida, USA

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• 作者：Charles R. Lane ; B. C. Autrey ; T. Jicha ; L. Lehto ; C. Elonen ; L. Seifert-Monson
• 关键词：Conditional inference tree ; Palustrine emergent marsh ; Palustrine forested wetland ; Reactive nitrogen
• 刊名：Wetlands
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：35
• 期：3
• 页码：459-471
• 全文大小：623 KB
• 参考文献：APHA (1998) Standard methods for the examination of water and wastewater, 20th edn. American Public Health Association, Washington, DC, USA
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• 作者单位：Charles R. Lane (1)
  B. C. Autrey (1)
  T. Jicha (2)
  L. Lehto (2)
  C. Elonen (2)
  L. Seifert-Monson (3)
  
  1. US Environmental Protection Agency, Office of Research and Development, National Exposure Research Laboratory, Cincinnati, OH, USA
  2. US Environmental Protection Agency, Office of Research and Development, National Health and Ecological Effects Research Laboratory, Duluth, MN, USA
  3. Integrated Biosciences Graduate Program, University of Minnesota, Duluth, MN, USA
  
• 刊物主题：Freshwater & Marine Ecology; Environmental Management; Ecology; Hydrogeology; Coastal Sciences; Landscape Ecology;
• 出版者：Springer Netherlands
• ISSN：1943-6246

文摘

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?±-.02 (range: 1.67-8.91) μg N kg DW? (dry weight) hr?, and no ecoregional differences were found. Areal calculations were 0.010-.356?g?N?m??day?. Carbon amended denitrification samples decreased ?8?%, while samples amended with N or N-?C averaged 2730-675?% 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.