Modeling phosphorus reduction strategies from the international St. Clair-Detroit River system watershed
Modeling phosphorus reduction strategies from the international St. Clair-Detroit River system watershed
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DOI：
10.1016/j.jglr.2019.04.005
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发表时间：
2019-08-01
影响因子：
2.2
通讯作者：
Kalcic, Margaret
中科院分区：
文献类型：
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作者：
Dagnew, Awoke;Scavia, Donald;Kalcic, Margaret
来自非点源的营养物负荷已经使全球大型水体的水质恶化。伊利湖是与美国和加拿大接壤的劳伦特五大湖中产量最高的湖，其水质受到底特律河的磷负荷的影响，底特律河排放了近19，000 km（2）的国际流域。我们使用土壤和水评估工具（SWAT）来评估一系列管理措施，以潜在地减少总磷（TP）和溶解活性磷（DRP）负荷。方案既包括单一做法，也包括多个做法的组合。单一的做法方案包括减少施肥率（率）和地下放置（PL），过滤带（FL），草水道，覆盖作物（CC），湿地（VVT），控制排水，并在耕作方法的变化。捆绑方案包括率，PL，FL，CC和WT与三种采用策略的组合：应用于所有适用区域，55%的随机选择的适用区域，以及55%的高磷产量适用区域。结果表明，在单一的实践方案中，FL，VVT，PL，CC和速率表现出良好的减少TP和DRP的损失，从农业为主的子流域。总的来说，CC、FL、VVT捆绑包的性能最好，其次是CC、PL、WT捆绑包，分别将负载减少了80%和70%，实现率为100%。然而，针对高磷产量地区的执行率几乎达到100%。这项工作的结果表明，有潜在的途径磷负荷减少，但需要广泛实施多种做法。(C)2019年国际五大湖研究协会。Elsevier B.V.出版，保留所有权利。
Nutrient loading from nonpoint sources has degraded water quality in large water bodies globally. The water quality of Lake Erie, the most productive of the Laurentian Great Lakes bordering the United States and Canada, is influenced by phosphorus loads from the Detroit River that drains an almost 19,000 km(2) international watershed. We used the Soil and Water Assessment Tool (SWAT) to evaluate a range of management practices to potentially reduce total phosphorus (TP) and dissolved reactive phosphorus (DRP) loads. Scenarios included both single practices and bundles of multiple practices. Single practice scenarios included fertilizer rate reduction (Rate) and sub-surface placement (PL), filter strips (FL), grassed waterways, cover crops (CC), wetlands (VVT), controlled drainage, and changes in tillage practices. Bundle scenarios included combinations of Rate, PL, FL, CC, and WT with three adoption strategies: application on all applicable areas, on 55% of randomly selected applicable areas, and on 55% of high phosphorus yielding applicable areas. Results showed that among the single practice scenarios, FL, VVT, PL, CC, and Rate performed well in reducing both TP and DRP loss from agricultural dominated sub-watersheds. Over all, the CC, FL, VVT bundle performed best followed by the CC, PL, WT bundle, reducing the load up to 80% and 70%, respectively, with 100% implementation. However, targeting high phosphorus yielding areas performed nearly as well as 100% implementation. Results from this work suggest that there are potential pathways for phosphorus load reduction, but extensive implementation of multiple practices is required. (C) 2019 International Association for Great Lakes Research. Published by Elsevier B.V. All rights reserved.