The results indicate pollution degree reduces from infall area to core area, and to outfall area, which shows wetland could purify contamination when water flows through the wetland.

• 评价结果证实，扎龙湿地从进水区、核心区到出水区污染程度有依次降低的趋势，这说明湿地对污染物有一定的净化作用。