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中文摘要：
研究了河套灌区春小麦-萝卜复种模式下，土壤、土壤溶液和地下水NO3^--N浓度的动态变化．结果表明：随着试验时间的延长，土壤表层NO3^--N含量降低，深层（100～150cm）增加；土壤溶液中、下层NO3^--N浓度（70、120cm）显著高于上层（30cm），尤其是在萝卜生长季．当前的灌溉条件下，不同年度、不同生长季土壤NO3^--N淋失量的多少与土壤水分的下渗量密切相关。且输入的氮素中有30％以上以NO3^--N的形式淋失掉．施肥区地下水NO3^--N浓度显著高于未施肥区，且65．5％的水样超过WHO规定的上限（11．3mg／L）．总之，经过连续2a的春小麦与萝卜复种可使表层土壤NO3^--N含量明显降低，但由于中、下层土壤剖面中残留大量的NO3^--N，因此在当前灌溉措施下，短期内NO3^--N淋失是不可避免的．
英文摘要：
The NO3^--N dynamics of the soil, soil solution and groundwater were studied under spring wheat and radish multiple-crop system in Hetao Irrigation District over two years. A strong tendency of NO3^--N to move from upper layer to deeper layer could be observed and soil NO3^--N was increased at the layer of 100 - 150cm. NO3^--N concentration of soil solution at the depth of 70 and 120 cm was significantly higher than that at the depth of 30 cm, especially in the radish growth season. NO3^--N leaching amount was correlated with deep percolation at both different crop growth seasons and different years and it accounted for higher than 30 % of total N input across two years. In the fertilizer plot, the concentration of NO3^--N in groundwater was far higher than that in the nonfertilizer plot, and 65.5 % samples were over the safe standard of WHO （11.3mg/L） in the fertilizer plot. The topsoil NO3^--N content was markedly decreased during the two years multiple-crop system. However, NO3^--N leaching was inevitable in the near future due to a large amount of residual NO3^--N in the middle and deeper soil profiles.
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