Within-river phosphorus retention: accounting for a missing piece in the watershed phosphorus puzzle.
Within-river phosphorus retention: accounting for a missing piece in the watershed phosphorus puzzle.
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DOI：
10.1021/es303562y
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发表时间：
2012-12
影响因子：
11.4
通讯作者：
H. Jarvie;A. Sharpley;J. Thad Scott;B. Haggard;M. Bowes;L. B. Massey
中科院分区：
文献类型：
--
作者：
H. Jarvie;A. Sharpley;J. Thad Scott;B. Haggard;M. Bowes;L. B. Massey
流域磷素管理中普遍存在的“难题”是如何解释磷素在陆地-淡水连续体中的非保守行为（滞留和再活化）。这往往阻碍了我们试图直接联系流域磷源与水质的影响。在这里，我们研究方面的河流内保留的废水流出物P和高流量下的再动员。大多数源解析方法属性P负荷动员下高流量（包括保留和再活化的污水P）的农业非点源。我们提出了一个新的简单的经验方法，使用氯化物作为保守的示踪剂的废水流出物，量化内河流保留的污水P，和它的贡献，河流P负荷，在高流量下重新流动。我们证明，在河流内的P保留可以有效地掩盖存在的污水P输入的水质记录。此外，我们强调，不占保留和再动员的污水P河流暴雨流P负荷的贡献，现有的源解析方法可能会显着高估农业非点源和低估混合土地利用流域的废水源。这对制定有效的流域补救战略具有重要意义，其中补救需要在点和非点磷贡献者之间公平和准确地分配。
The prevailing "puzzle" in watershed phosphorus (P) management is how to account for the nonconservative behavior (retention and remobilization) of P along the land-freshwater continuum. This often hinders our attempts to directly link watershed P sources with their water quality impacts. Here, we examine aspects of within-river retention of wastewater effluent P and its remobilization under high flows. Most source apportionment methods attribute P loads mobilized under high flows (including retained and remobilized effluent P) as nonpoint agricultural sources. We present a new simple empirical method which uses chloride as a conservative tracer of wastewater effluent, to quantify within-river retention of effluent P, and its contribution to river P loads, when remobilized under high flows. We demonstrate that within-river P retention can effectively mask the presence of effluent P inputs in the water quality record. Moreover, we highlight that by not accounting for the contributions of retained and remobilized effluent P to river storm-flow P loads, existing source apportionment methods may significantly overestimate the nonpoint agricultural sources and underestimate wastewater sources in mixed land-use watersheds. This has important implications for developing effective watershed remediation strategies, where remediation needs to be equitably and accurately apportioned among point and nonpoint P contributors.