| A fuzzy comprehensive weighted model and the content data of 7 heavy metals in sediments from 3 typical wetlands were used to assess heavy metal pollution in Wenruitang river. The results of fuzzy comprehensive assessment showed that the sediments from Sanyang wetland, which located in residential area, belonged to Ⅴ grade pollution, Zn and Cd were the main pollutants. Sediments from Wolonghe river locating in hilly upper reach, belonged to Ⅲ grade, with Cd as the primary pollutant. Though the sediments from Niuqiaodihe river locating in industrial area, also belonged to Ⅴ grade, the pollution score of 5 heavy metals（Cu，Cr，Ni，Zn and Cd）was 1.0, smaller than its scores in the former two typical river reaches which were 1.2 and 3.3, respectively. Results of heavy metal pollution level in sediments by Nemerow indexes and Potential ecological risk coefficient assessment were arranged in order of Niudihe ＞ Sanyang wetland ＞ Wolong river, which were consistent with fuzzy comprehensive assessment results. |
