为研究不同降雨水平年旱作玉米农业面源污染流失特征，选取辽河流域昌图县玉米地试验田进行面源污染试验，对比分析了其在2013年丰水年和2014年平水年的面源污染流失规律。结果表明，对所选试验地点（坡度0.5‰，种植玉米），在前期降雨量比较少的条件下，中雨很难产生径流污染，但是在前一场次降雨量较大时，中雨也会导致产流，形成面源污染流失。2013年玉米生长季TN、TP和CODCr的输出系数分别为5.46 kg/hm2、0.57 kg/hm2、25.79 kg/hm2，而2014年的输出系数分别3.14 kg/hm2、0.27 kg/hm2、19.62 kg/hm2，较2013年都有所增加，即丰水年产生的面源污染相对平水年较多。

In order to study non-point source pollution from corn field under different rainfall levels, a series field experiments were carried out in a corn field plot in the Liao River region, and the loss rules of non-point source pollution from the corn field land under different rainfall levels between wet year of 2013 and normal year of 2014 were analyzed. Results showed that moderate rain events were difficult to form non-point source pollution in the experiment plot with a slope of 0.5‰ when the antecedent rainfall amount was less, but it would form non-point source pollution when the antecedent rainfall was large. The export coefficients of TN, TP and CODCr are 5.46 kg/hm2, 0.57 kg/hm2, 25.79 kg/hm2 in 2013, and in 2014 are 3.14 kg/hm2, 0.27 kg/hm2and 19.62 kg/hm2 respectively, which are higher than those of 2013.

国家“十二五”重大科技项目（2013ZX07501005）