基于SWAT模型的泗河流域除草剂迁移模拟

泗河流域农药污染对南四湖湖泊乃至南水北调工程具有重要的影响，为了解流域农药迁移过程并对其采取治理措施，本研究在泗河流域通过实地采样与调查、室内实验分析、数据统计等手段，借助SWAT模型对流域除草剂阿特拉津及其代谢产物进行迁移模拟.结果表明，除草剂输出与流域径流量有很高的相关性，输出时间以7~8月份为主，输出量占全年的69%以上.且受河道长度、耕地分布等因素的影响，阿特拉津的输出量以东部上游地区和中部地区为主，流域出水口处的阿特拉津输出量居中等水平；阿特拉津代谢产物DEA和DIA的输出量的空间分布相似，以下游流域出口处和中部地区为主.本研究可为流域除草剂迁移治理提供理论支持.

Simulation of herbicide transportation in Sihe watershed by SWAT model

Pesticide pollution in Sihe watershed, China can have a negatively effect on Nansihu lake and aquatic environment of South-North Water Diversion Project. To understand the process of herbicides transport and best management practices in the watershed, transport simulation of herbicide including atrazine and its transformed products in Sihe watershed performed by SWAT model and field investigation. The results demonstrated that there was a high correlation between the output of herbicides and runoff. The time of herbicides output was mainly concentrated in July and August, which accounted for more than 69% of output in the whole year. The spatial distribution of herbicides load in the watershed was affected by the length of the river and distribution of agricultural land. The output of atrazine distributed primarily in eastern and central region of upstream areas, and catchment outlet of herbicide output was in the middle. However, the spatial distribution of the output of atrazine transformed products including DEA and DIA were similar to their parent compound, which mainly located in the catchment outlet of the downstream areas and the central region in Sihe watershed. The study can provide theoretical support for the management of herbicide migration in the basin.