潭江底栖动物多样性调查及完整性分析

Investigation and integrity analysis of benthic macroinvertebrates diversity in the Tanjiang River

2011年3月和7月调查了潭江各样点的底栖动物群落,以多样性为评价指标,评估水质状况,并建立了潭江底栖动物完整性指数,评价潭江健康状况.结果显示,底栖动物共计29种.经过指标筛选,建立了适合潭江的B-IBI指标体系,该体系包括多样性指数、种类数、Margalef丰富度指数、均匀度指数、螺类占软体动物百分比.完整性评级结果与样点污染情况及生境有关.完整性评级为高、好、适度、差和恶化的样点分别为5个、3个、4个、5个和3个.夏季潭江健康状况要好于春季.

The benthos community of the the Tanjiang River were investigated in March and July, 2011. Diversity index was used to evaluate the water quality and Index of Biotic Integrity was established to assess health condition of the Tanjiang River. There were 8sections(20sampling points in total) of the Tanjiang River were selected for sampling and 29benthos species were collected in total. Index of Biotic Integrity was used to rate the water quality of sampling points. Indexs were screening to build B-IBI index system which was appropriated for Tanjiang. The indexs system includes Diversity index, species number, Margalef richness index, Evenness index and the percentage of snailsin molluscs. Results of integrity rating were related to the pollution and habitat of sampling points. The high, good, medium, bad and worse integrity ratings were 5, 3, 4, 5and 3respectively. The health condition of the Tanjiang River in summer is better than that in spring.