The evaluation of water quality and survey of benthic diversity in the Baiyangdian Lake (China)

摘要

The investigation of benthic macroinvertebrates of Baiyangdian Lake was done in 2014. It contains the composition and diversity of benthic macroinvertebrates. Making an analysis of the survey result discovers that the diversity index of Yuanyang Island was the lowest as the sewage river entrance. No. 2 sampling point, which was the heavy polluted water, and the others were approximative, all being in the range of 1 ～ 2, which were the moderately polluted water. Therefore, we can say that Baiyangdian Lake was moderately polluted water. Richness, Shannon Wiener diversity index, evenness index of the three annual change trend was consistent, to analyze the correlation between the index of richness and Shannon Wiener diversity, the results shows that the correlation coefficient is 0.929, indicated correlation. The main groups of benthic macroinvertebrates freshwater lake in Baiyangdian Lake were including the mollusca, annelid and aquatic insects. Due to the sensitive of benthic macroinvertebrates to the change of environment, when the water was polluted, the benthic macroinvertebrates community structure and diversity will change, accordingly, the types and characteristics of community as an environmental evaluation index has been widely used in the monitoring of water quality in lakes.