【摘要】 为了全面了解大宁河各个河段的具体生态健康状况,为大宁河及其他库区支流的河流管理提供参考依据,根据2017年3月对大宁河源头至河口16个典型断面的浮游植物生态调查分析的结果,选取了25个备选指标,通过分布范围、判别能力和相关性分析,筛选出核心指标,计算了其浮游植物完整性指数(P-IBI)。基于该指数,构建了大宁河河流生态健康度的评价指标体系和标准,并对其进行了评价。结果显示:本次大宁河河流总体处于亚健康状态,其中上游段较为健康,中、下游段处于亚健康状态,局部样点呈现病态,尤其是"龙井湾-双龙镇"段,其生态健康度较差,是受损严重的河段。初步推断这主要是由于该河段人口密集,污染物负荷大造成的。建议对受损河段重点关注,并有针对性地开展生态修复治理。更多还原

【Abstract】 In order to comprehensively understand the specific ecological health status of the various river sections of the Daning River, and provide reference for river management of the Daning River and other tributaries of Three Gorges Reservoir areas, according to the results of phytoplankton ecological investigation and analysis of 16 typical cross sections from the source of the Danning River to its estuary in March 2017, the core indexes were selected from 25 alternative indexes by the distribution range, discrimination ability and correlation analysis. The phytoplankton index of biotic integrity(P-IBI) was calculated and the evaluation index system and standard of ecological health degree of the Daning River were constructed as well as the health degree was evaluated. The results show that the Daning River is in a sub-healthy state at present, in which, the upper reaches are relatively healthy, the middle and lower reaches are in a sub-healthy state, and the local spots are pathological, especially the Longjing-bay to Shanglong town section, being a severely damaged section. It is preliminarily concluded that this is mainly due to the dense population and the heavy pollutant load. It is recommended to focus on the damaged river sections and carry out targeted ecological restoration management.更多还原