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Effects of riparian denitrification on stream nitrate - evidence from isotope analysis and extreme nitrate leaching during rainfall

机译：河岸反硝化对硝酸盐溪流的影响 - 从同位素分析和降雨期间极其硝酸盐浸出的证据

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The effects of riparian denitrification on stream nitrate were investigated by detailed soil water observations and isotope analysis at a small headwater catchment in an urban area near Tokyo, central Japan. In the base flow period, stream nitrate concentration (<100 μM) was comparable with that of riparian ground water which had less nitrate than unsaturated soil water. Nitrogen isotope analysis showed that the consumption of nitrate by denitrification took plane in riparian ground water, suggesting that denitrification is an important process to control nitrate leaching to streams. During rainfall, the concentration of strain nitrate increased up to 400 μM, which was comparable with that of pre-event soil water. The fact that soil water nitrate directly leached to streams indicated that the riparian denitrification process did not work during rainfall because of the rapid discharge of water. A decrease of denitrification effects is a possible reason for high stream nitrate concentration during rainfall.
机译：日本东京东京东京市东京市区的一个小型地区的土壤水观察结果和同位素分析研究了河岸反硝化对硝酸盐的影响。在碱流动期间，硝酸盐浓度（<100μm）与刚性土壤少于不饱和土水的刚性磨水物相当。氮同位素分析表明，通过脱氮的硝酸盐消耗在河岸地下水中取出平面，表明反硝化是控制硝酸盐浸出到溪流的重要过程。在降雨期间，硝酸株的浓度增加至400μm，与事后土壤水相当。土壤水硝酸盐直接浸出到溪流的事实表明，由于水的快速放电，河岸反硝化过程在降雨期间不起作用。抵抗效应的减少是在降雨期间高硝酸盐浓度的可能原因。

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