五里湖生态系统健康评价初探

Preliminary Exploration of Ecosystem Health Assessment for Wuli Lake

为了了解多个生态工程实施后,五里湖生态系统的健康状况,应用营养状态-综合指数法(TSI-CI),采用2010年12个月份的监测数据,对探索五里湖生态系统健康状况进行初步评价。首先,选用Chla、SD、TP和TN4个指标,用相关加权指数法进行营养状态评价,再选择物化和生物指标无量纲化处理后,计算综合指数进行综合评价。结果表明:2010年,五里湖生态系统健康状况在7月最好,8月最差;以Chla为代表的综合营养状态指标发生显著增加或降低,并跨越不同的营养分级时,TSI和CI发生显著背离,在其他时间两者关系不明显。

In order to know the status of Wuli Lake after several ecological projects being carried out, studies as follows were performed. The method of trophic state-comprehensive index was used to assess the ecosystem health of Wuli Lake in 2010. On this study, 15 sampling sites were determined, and the work of sampling was done once a month. After that, 4 indices including Cbla, SD, TP and TN were chosen to calculate the trophic status index （TSI）, and nondimensionalizated indicators such as physical indicators, chemical indicators and biological indicators were used to calculate comprehensive index to estimate the ecosystem health state. The results showed that the ecosystem health of Wuli Lake was the best on July and the worst on August in 2010, which was abnormal. Maybe it had something to do with the digging of cyanobacteria and the rainy weather at that time. And the deviation between TSI and CI was also detected, when TSI increased or decreased rapidly and passed through the threshold of grading standards of eutrophication.