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首页> 外文期刊>Journal of the American Water Resources Association >Influence of Riparian Seepage Zones on Nitrate Variability in Two Agricultural Headwater Streams
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Influence of Riparian Seepage Zones on Nitrate Variability in Two Agricultural Headwater Streams

机译：河岸渗流区对两种农业源头河水硝酸盐变异性的影响

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Riparian seeps have been recognized for their contributions to stream flow in headwater catchments, but there is limited data on how seeps affect stream water quality. The objective of this study was to examine the effect of seeps on the variability of stream NO3-N concentrations in FD36 and RS, two agricultural catchments in Pennsylvania. Stream samples were collected at 10-m intervals over reaches of 550 (FD36) and 490m (RS) on 21 occasions between April 2009 and January 2012. Semi-variogram analysis was used to quantify longitudinal patterns in stream NO3-N concentration. Seep water was collected at 14 sites in FD36 and 7 in RS, but the number of flowing seeps depended on antecedent conditions. Seep NO3-N concentrations were variable (0.1-29.5mg/l) and were often greater downslope of cropped fields compared to other land uses. During base flow, longitudinal variability in stream NO3-N concentrations increased as the number of flowing seeps increased. The influence of seeps on the variability of stream NO3-N concentrations was less during storm flow compared to the variability of base flow NO3-N concentrations. However, 24h after a storm in FD36, an increase in the number of flowing seeps and decreasing streamflow resulted in the greatest longitudinal variability in stream NO3-N concentrations recorded. Results indicate seeps are important areas of NO3-N delivery to streams where targeted adoption of mitigation measures may substantially improve stream water quality.
机译：河岸渗流因其对上游水源汇流的贡献而得到公认，但是关于渗流如何影响河水水质的数据有限。这项研究的目的是检验渗漏对宾夕法尼亚州两个农业集水区FD36和RS中NO3-N物流浓度变化的影响。在2009年4月至2012年1月之间的21次中，以10-m的间隔采集了550（FD36）和490m（RS）河段的水样。半变异函数分析用于量化NO3-N浓度的纵向模式。在FD36的14个站点和RS的7个站点收集了渗水，但渗水的数量取决于先决条件。与其他土地利用相比，NO3-N的渗透浓度是可变的（0.1-29.5mg / l），通常耕地的下坡更大。在基流过程中，流态NO3-N浓度的纵向变化随流动渗流数量的增加而增加。与基流NO3-N浓度的变化相比，在暴雨期间渗流对溪流NO3-N浓度变化的影响较小。但是，FD36暴风雨过后24小时，渗流数量的增加和水流的减少导致所记录的NO3-N浓度最大的纵向变化。结果表明，渗漏是向河流输送NO3-N的重要区域，在这些区域采取有针对性的缓解措施可能会大大改善河流的水质。

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