应用大型底栖动物污染指数评价杭州湾潮间带环境质量

Assessment on environmental quality in tideland of Hangzhou Bay by macrozoobenthos pollution index

采用大型底栖动物污染指数（macrozoobenthos pollution index，MPI）对杭州湾生态监控区2006年和2007年的潮间带底栖动物相关参数进行分析，探讨了该区潮间带环境质量的现状和变化趋势。结果表明：2006～2007年，杭州湾生态监控区潮间带环境质量总体下降，6个潮间带断面环境质量从好到差依次为镇海港、慈溪十塘、嘉兴乍浦、慈溪庵东、上虞港和海宁尖山，各断面高、中、低3个潮带环境质量相比，中潮带好于高潮带和低潮带。围填海工程对潮间带底栖生物的生存环境的破坏逐年加剧，是该区生态环境质量下降的重要原因。杭州湾强烈的潮流作用导致的潮间带底质分布不均匀，以及底栖生物在潮间带的自然生态分布，是潮间带环境质量变化的部分原因。

Based on the macrofaunal data in ecological monitor zone of Hangzhou Bay from 2006 to 2007, where 6 sections including high, middle and low tidal flat respectively were set, Macrozoobenthos Pollution Index（MPI） is used to assess the environmental qual- ity in the zone in this paper. The present state and change trend of the tideland environmental quality in the zone were also discussed. The results show that the tideland environmental quality in the ecological monitor zone of Hangzhou Bay was decreased from 2006 to 2007. The environmental quality order of 6 sampling sections in the ecological monitor zone ranked from good to bad is Zhenhai port, Shitang, Zhapu, Andong, Shangyu port and Jianshan. Comparing the environmental quality of high, middle and low tideland stations, middle tideland＇s were better than high and low tideland＇s. The destruction of tideland macrofaunal subsistence environment caused by the sea reclamation projects was serious year by year. It is the important reason of the decline of ecological environmental quality in this zone. Uneven distribution of tideland sediment caused by the strong tidal current action in Hangzhou Bay, and nature ecological distribution of macrofaunal in the tideland, is a part reason of tideland environmental quality change.