期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 53, 期 10, 页码 5613-5621出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.8b05152
关键词
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资金
- National Science Foundation [9318452, 9726877, 0235755, 0743192, 1255159]
- Miami Valley Resource Conservation and Development District
- Direct For Biological Sciences
- Division Of Environmental Biology [9726877, 0235755] Funding Source: National Science Foundation
- Division Of Environmental Biology
- Direct For Biological Sciences [9318452, 1255159] Funding Source: National Science Foundation
Storm events disproportionately mobilize dissolved phosphorus (P) compared to nitrogen (N), contributing to reduction in load N:P. In agricultural watersheds, conservation tillage may lead to even further declines in load N:P due to dissolved P accumulation in the top soil layers. Due to an increase in this management activity, we were interested in the impacts of conservation tillage on N and P loads during storm events. Using a 20 year data set of nutrient loads to a hypereutrophic reservoir, we observed disproportionately increasing P loads relative to base flow during storm events, whereas N loads were proportional to discharge. We also observed a change in that relationship, i.e., even greater P load relative to base flow with more conservation tillage in the watershed. This suggests conservation tillage may contribute to significantly reduced N:P loads during storms with potential implications for the water quality of receiving water bodies.
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