中文摘要：

西北干旱半干旱地区地表水和地下水极端缺乏，集雨水是唯一有潜力的水资源。采用人工生态系统模拟紫花苜蓿、红豆草、冰草三种不同植被带对集雨水径流污染物的消减作用，通过对降雨过程中三种植被带在不同长度上对污染物去除率的分析，确定了植被带的最佳长度；比较三种植被带对集雨水污染物的去除率，得出冰草植被带的去除效果最好。

英文摘要：

In Northwest China＇s arid and semi-arid areas, surface water and underground water are in extreme shortage, and harvested rain water is the only potential resourse. An artificial ecosystem was used to study the pollutant removal mechanisms of stormwater runoff through alfalfa greenbelt, sainfoin greenbelt and agropyron greenbelt. By the analysis of rain water pollutants removal rate in different greenbelt length, the result pollutant removal efficiency through the three of greenbelts, the agropyron greenbelt was the highest. confirmed the optimal length of greenbelt. Compared the result showed that the pollutant removal efficiency in the