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首页> 美国卫生研究院文献>Wiley-Blackwell Online Open >A Regional Modeling Framework of Phosphorus Sources and Transport in Streams of the Southeastern United States
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A Regional Modeling Framework of Phosphorus Sources and Transport in Streams of the Southeastern United States

机译：美国东南部河流中磷源和运输的区域建模框架

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AbstractWe applied the SPARROW model to estimate phosphorus transport from catchments to stream reaches and subsequent delivery to major receiving water bodies in the Southeastern United States (U.S.). We show that six source variables and five land-to-water transport variables are significant (p<0.05) in explaining 67% of the variability in long-term log-transformed mean annual phosphorus yields. Three land-to-water variables are a subset of landscape characteristics that have been used as transport factors in phosphorus indices developed by state agencies and are identified through experimental research as influencing land-to-water phosphorus transport at field and plot scales. Two land-to-water variables – soil organic matter and soil pH – are associated with phosphorus sorption, a significant finding given that most state-developed phosphorus indices do not explicitly contain variables for sorption processes. Our findings for Southeastern U.S. streams emphasize the importance of accounting for phosphorus present in the soil profile to predict attainable instream water quality. Regional estimates of phosphorus associated with soil-parent rock were highly significant in explaining instream phosphorus yield variability. Model predictions associate 31% of phosphorus delivered to receiving water bodies to geology and the highest total phosphorus yields in the Southeast were catchments with already high background levels that have been impacted by human activity.
机译：摘要我们应用SPARROW模型来估算磷从集水区到河段的运移以及随后向美国东南部（美国）主要接收水体的运移。我们表明，在解释长期对数转换后的年平均磷产量中的67％的变异性时，六个来源变量和五个陆对水运输变量具有显着性（p <0.05）。土地到水的三个变量是景观特征的一个子集，已被国家机构开发为磷指标中的运输因子，并通过实验研究确定为影响田间和田间尺度上的土地到水磷的运输。磷吸附有两个土地对水的变量-土壤有机质和pH值，这是一个重要发现，因为大多数国家制定的磷指数并未明确包含吸附过程的变量。我们对美国东南部河流的调查结果强调了考虑土壤中磷的含量以预测可获得的河流水质的重要性。与土壤-母体岩石相关的磷的区域估计值对解释河内磷产量的变化具有重要意义。模型预测将31％的送入接收水体的磷与地质联系起来，东南部最高的总磷产量是受人类活动影响已经具有很高背景水平的流域。

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