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首页> 外文期刊>Journal of the American Water Resources Association >The Influence of Two-Stage Ditches with Constructed Floodplains on Water Column Nutrients and Sediments in Agricultural Streams
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The Influence of Two-Stage Ditches with Constructed Floodplains on Water Column Nutrients and Sediments in Agricultural Streams

机译：漫滩平原两阶段沟对农业河流水柱养分和沉积物的影响

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摘要

The two-stage ditch is a novel management practice originally implemented to increase bank stability through floodplain restoration in channelized agricultural streams. To determine the effects of two-stage construction on sediment and nutrient loads, we monitored turbidity, and also measured total suspended solids (TSS), dissolved inorganic nitrogen (N) species, and phosphorus (P) after two-stage ditch construction in reference and manipulated reaches of four streams. Turbidity decreased during floodplain inundation at all sites, but TSS and P, soluble reactive phosphorus (SRP) and total phosphorus (TP) decreased only in the two-stage ditches with longer duration of inundation. Both TSS and TP were positively correlated within individual streams, but neither were correlated with turbidity. Phosphorus was elevated in the stream to which manure was applied adjacent to the two-stage reach, but not the reference reach, suggesting that landscape nutrient management plans could restrict nutrient transport to the stream, ultimately determining the efficacy of instream management practices. In addition, ammonium and nitrate decreased in two-stage reaches with lower initial N concentrations. Overall, results suggest that turbidity, TSS, and TP were reduced during floodplain inundation, but the two-stage alone may not be effective for managing high inorganic N loads.
机译：两级沟渠是一种新颖的管理方法，最初是通过渠道化农业流中的洪泛区恢复来提高河岸的稳定性而实施的。为了确定两阶段施工对沉积物和养分负荷的影响，我们监测了浊度，还测量了两阶段沟施工后的总悬浮固体（TSS），溶解的无机氮（N）物种和磷（P）。并操纵了四个溪流洪泛区淹没期间所有站点的浊度均降低，但只有在淹没持续时间较长的两阶段沟渠中，TSS和P，可溶性反应性磷（SRP）和总磷（TP）才降低。在各个流中，TSS和TP均呈正相关，但与浊度均不相关。在靠近两段河段而不是参考河段施肥的河流中，磷含量升高，这表明景观养分管理计划可能会限制养分向河流的迁移，最终决定了河道管理实践的有效性。此外，铵态氮和硝酸盐在两阶段均以较低的初始氮浓度下降。总体而言，结果表明，洪泛区淹没过程中浊度，TSS和TP降低，但仅分两步处理可能无法有效控制高无机氮含量。

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