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The role of C:N:P stoichiometry in affecting denitrification in sediments from agricultural surface and tile-water wetlands
Nutrient stoichiometry within a wetland is affected by the surrounding land use, and may play a significant role in the removal of nitrate (NO(3)–N). Tile-drained, agricultural watersheds experience high seasonal inputs of NO(3)–N, but low phosphorus (PO(4)–P) and dissolved organic carbon (DOC) load...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer International Publishing
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4801829/ https://www.ncbi.nlm.nih.gov/pubmed/27064357 http://dx.doi.org/10.1186/s40064-016-1820-6 |
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author | Grebliunas, Brian D. Perry, William L. |
author_facet | Grebliunas, Brian D. Perry, William L. |
author_sort | Grebliunas, Brian D. |
collection | PubMed |
description | Nutrient stoichiometry within a wetland is affected by the surrounding land use, and may play a significant role in the removal of nitrate (NO(3)–N). Tile-drained, agricultural watersheds experience high seasonal inputs of NO(3)–N, but low phosphorus (PO(4)–P) and dissolved organic carbon (DOC) loads relative to surface water dominated systems. This difference may present stoichiometric conditions that limit denitrification within receiving waterways. We investigated how C:N:P ratios affected denitrification rates of sediments from tile-drained mitigation wetlands incubated for: 0, 5, 10, and 20 days. We then tested whether denitrification rates of sediments from surface-water and tile-drained wetlands responded differently to C:N ratios of 2:1 versus 4:1. Ratios of C:N:P (P < 0.05) and incubation length (P < 0.05) had a significant effect on denitrification in tile-drained wetland sediments. Carbon limitation of denitrification became evident at elevated NO(3)–N concentrations (20 mg L(−1)). Denitrification measured from tile water and surface water wetland sediments increased significantly (P < 0.05) at the 2:1 and 4:1 C:N treatments. The results from both experiments suggest wetland sediments provide a limiting pool of labile DOC to maintain prolonged NO(3)–N removal. Also, DOC limitation became more evident at elevated NO(3)–N concentrations (20 mg L(−1)). Irrespective of NO(3)–N concentrations, P did not limit denitrification rates. In addition to wetting period, residence time, and maintenance of anaerobic conditions, the availability of labile DOC is playing an important limiting role in sediment denitrification within mitigation wetlands. |
format | Online Article Text |
id | pubmed-4801829 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Springer International Publishing |
record_format | MEDLINE/PubMed |
spelling | pubmed-48018292016-04-09 The role of C:N:P stoichiometry in affecting denitrification in sediments from agricultural surface and tile-water wetlands Grebliunas, Brian D. Perry, William L. Springerplus Research Nutrient stoichiometry within a wetland is affected by the surrounding land use, and may play a significant role in the removal of nitrate (NO(3)–N). Tile-drained, agricultural watersheds experience high seasonal inputs of NO(3)–N, but low phosphorus (PO(4)–P) and dissolved organic carbon (DOC) loads relative to surface water dominated systems. This difference may present stoichiometric conditions that limit denitrification within receiving waterways. We investigated how C:N:P ratios affected denitrification rates of sediments from tile-drained mitigation wetlands incubated for: 0, 5, 10, and 20 days. We then tested whether denitrification rates of sediments from surface-water and tile-drained wetlands responded differently to C:N ratios of 2:1 versus 4:1. Ratios of C:N:P (P < 0.05) and incubation length (P < 0.05) had a significant effect on denitrification in tile-drained wetland sediments. Carbon limitation of denitrification became evident at elevated NO(3)–N concentrations (20 mg L(−1)). Denitrification measured from tile water and surface water wetland sediments increased significantly (P < 0.05) at the 2:1 and 4:1 C:N treatments. The results from both experiments suggest wetland sediments provide a limiting pool of labile DOC to maintain prolonged NO(3)–N removal. Also, DOC limitation became more evident at elevated NO(3)–N concentrations (20 mg L(−1)). Irrespective of NO(3)–N concentrations, P did not limit denitrification rates. In addition to wetting period, residence time, and maintenance of anaerobic conditions, the availability of labile DOC is playing an important limiting role in sediment denitrification within mitigation wetlands. Springer International Publishing 2016-03-22 /pmc/articles/PMC4801829/ /pubmed/27064357 http://dx.doi.org/10.1186/s40064-016-1820-6 Text en © Grebliunas and Perry. 2016 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
spellingShingle | Research Grebliunas, Brian D. Perry, William L. The role of C:N:P stoichiometry in affecting denitrification in sediments from agricultural surface and tile-water wetlands |
title | The role of C:N:P stoichiometry in affecting denitrification in sediments from agricultural surface and tile-water wetlands |
title_full | The role of C:N:P stoichiometry in affecting denitrification in sediments from agricultural surface and tile-water wetlands |
title_fullStr | The role of C:N:P stoichiometry in affecting denitrification in sediments from agricultural surface and tile-water wetlands |
title_full_unstemmed | The role of C:N:P stoichiometry in affecting denitrification in sediments from agricultural surface and tile-water wetlands |
title_short | The role of C:N:P stoichiometry in affecting denitrification in sediments from agricultural surface and tile-water wetlands |
title_sort | role of c:n:p stoichiometry in affecting denitrification in sediments from agricultural surface and tile-water wetlands |
topic | Research |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4801829/ https://www.ncbi.nlm.nih.gov/pubmed/27064357 http://dx.doi.org/10.1186/s40064-016-1820-6 |
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