基于浮游藻类生物完整性指数的永安河小流域健康评价

Health Evaluation of Yongan River Small Watershed Based on Biological Integrity Index of Planktonic Algae

[目的]根据2018年夏季对常州市永安河小流域10个样点进行浮游藻类及环境因子的监测,运用生物完整性的方法和理论,构建夏季永安河小流域浮游藻类生物完整性指数,评价夏季永安河小流域水生态健康状态。[方法]采用文献调查法筛选确定参照河流及参照点,对20个候选指标进行分布范围筛选、判别能力分析、参数间相关性分析等。[结果]获得了永安河小流域丰水期P-IBI指数的5个核心指标:藻类属的总数、硅藻属数量比例、小环藻属密度百分比、细小平裂藻属细胞密度和蓝藻门密度百分比。采用比值法统一各参数的量纲,累加后得到丰水期太湖P-IBI分值,并划分健康评价标准。[结论]应用P-IBI对研究区域水生态进行评价,1个样点评价结果为健康,7个样点评价结果为亚健康,2个样点评价结果为一般。

[Objective]According to the monitoring of planktonic algae and environmental factors of 10 samples in the Yongan River small watershed in Changzhou City in summer 2018,the biological integrity method and theory were used to construct the biological integrity index of planktonic algae in the Yongan River small watershed in summer to evaluate the health status of aquatic ecology in the small watershed of Yongan River.[Method]The literature survey method was adopted to determine the reference rivers and reference points,and the 20 candidate indicators were screened for distribution range,discriminant analysis and correlation analysis.[Result]Five core indicators of the P-IBI index in the Yongan River small watershed during wet season:the total number of algae,the proportion of diatoms,the percentage of density of Cyclotella,the cell density of Schizophyllum,and the percentage of density of Cyanophyta.The ratio method was used to unify the dimensions of each parameter.After accumulation,the P-IBI score of Taihu Lake in wet season was obtained,and the health evaluation criteria were divided.[Conclusion]P-IBI was used to evaluate the aquatic ecology in the study area.One sample evaluation result was healthy,7 sample evaluation results were sub-healthy,and 2 sample evaluation results were general.