应用F-IBI对太子河流域水生态健康评价的初步研究

An assessment of ecosystem health in Taizi River basin using F-IBI

采用鱼类生物完整性指数(F-IBI)评估了中国东北太子河流域的环境质量。于2009年5月在太子河流域61个点位(参考点26个,受损点35个)对鱼类进行抽样采集,捕获到鱼类34种,分属9科,共计2 247尾。采用23个生物参数进行干扰反应、相关性和生物参数判别能力的分析,最终确定了鱼类总分类单元数、总渔获量、雅罗鱼亚科种类百分比、耐污物种百分比、广布种百分比等5个指标,用于构建F-IBI。利用三分法统一各个参数量纲,将各个指数加和得到IBI值,IBI分数为5～25(IBI=25～22为健康,IBI=21～18为亚健康,IBI=17～14为一般,IBI=13～10为较差,IBI=9～5为极差)。研究结果显示,19个样点为健康,11个样点为亚健康,12个样点一般,11个样点较差,8个样点极差,而且IBI与栖息地生境质量显著相关(P<0.01)。

Fish index of biotic integrity（F-IBI） was used to assess the environmental conditions in Taizi River basin.Five indexes including total number of taxa,total fish catch,percent of subfamily Leuciscinae,percent of tolerant species,and percent of widespread species were selected for the establishment of F-IBI by analysis of reflect disturbance,Pearson correlation and judgment ability performed on 23 candidate metrics in the samples collected from 61 sites（26 reference sites and 35 impaired sites） in Taizi River basin during May of 2009.The values of metrics were calculated by three scoring methods,and F-IBI was established by combination of the 5 indices.The values of IBI were found to be ranged from 5 to 25,IBI=25-22 for the healthy fish,21-18 for the sub-healthy,17-14 for the fair,13-10 for the poor,and 9-5 for the very poor.The results showed that there were 19 sites for the healthy,11 sites for the sub-healthy,12 sites for the fair,11 sites for the poor and 8 sites for the very poor in Taizi River basin,and there were significant relationship between the IBI values and habitat quality（P0.01）.