中文摘要：

以人工降雨实验模拟的方法，对有机氯农药在降雨过程中非点源污染的产生进行了研究．结果表明，在降雨过程中，表层径流中有机氯农药的输出量高于土壤渗流液．土壤径流中有机氯农药浓度的输出呈现先下降后平缓的趋势．土壤有机质影响着降雨过程中有机氯农药浓度的输出变化趋势．泥炭土径流中有机氯农药的输出量相对较高．有机氯农药残留总量沿土壤剖面的总体变化趋势为随深度增加而下降，其峰值出现在0.5cm，反映了污染物的转移规律．泥炭土中有机氯农药的残留量最低．泥炭土、黄褐土和风沙土中有机氯农药含量的峰值均出现在第2次和第3次采样时间，但在30d后有机氯农药的残留量仍较高，表明有机氯农药在土壤中残留时间长，可能存在着一定的生态风险．

英文摘要：

The mechanism of non-point source pollution of organochlorine pesticides （OCPs） in runoff was studied by simulative rainfall method. The results show that surface runoff plays a more important role than the seepage water in the transport of OCPs from soil to water. The concentration of OCPs in the runoff decreased with sampling time and then reached steady state after 60 minutes. It was found that the content of soil organic matter had great influence on the transport of OCPs from soil to water. In the water, the highest concentration of OCPs was found in the runoff of the peat soils. In the soil, the total content of OCPs decreased with depth. Compared with other soil type, the content of OCPs in the peat was the lowest. The highest concentration of OCPs were found at second and third sampling times. The OCPs were detected in relatively high concentration even after 30 days, suggesting possible potential ecological risk of OCPs in the real environment.