赣江尾闾地区鄱阳湖湖汊健康状况评价

评价赣江尾闾地区鄱阳湖湖汊的健康状况,为鄱阳湖水生态修复和湖泊生态系统功能的提升提供科学的管理依据,并为尾闾地区水系综合整治工程提供指导。选择基础水面面积在3.0 km~2以上的7个湖汊,每个湖汊设置1个监测点,2017年2月-2019年2月每月监测1次。评价指标包括水质达标率、浮游植物、湖汊形态结构变化和用水保证率。熵权法评价湖汊生态健康状态,突变级数法评价湖汊功能健康状态,综合健康指数评价湖汊整体健康状态。结果表明:赣江湖汊生态健康及水功能健康均随季节变化而变化,水环境是湖汊生态健康评价的重要指标,其权重达到0.5以上;2018年湖汊健康状态好于2017年,同一评价年度内综合健康状态为夏季好于秋季好于冬季好于春季,各湖汊综合健康状态有明显的空间差异;南支所属湖汊综合健康状态优于中支和北支,湖汊水面面积大小及季节变化是影响综合健康状态的主要因素。通过水系连通等工程措施进行精准调控可提升湖汊综合健康状态。

Health Status Evaluation of Poyang Lake Branches in Lower Reaches of Ganjiang River

In order to evaluate the comprehensive health status of Poyang Lake Branch in the end of Ganjiang River, based on the ecological health of Poyang Lake Branch and water functional health, a comprehensive health status evaluation system was constructed. Exploratory adoption of comprehensive evaluation refers to the comprehensive health state of lake branch was obtained by combining entropy bifurcation method with mutation series method. The results showed that:the spatial and temporal variation of the comprehensive health state of Poyang Lake branch in the end of Ganjiang River is larger than that of Poyang Lake Branch. The health status of Lake Branch in 2018 is better than that of Lake Branch in 2017.The order of comprehensive health status in the same evaluation year was from good to bad season in the order of second quarter > third quarter > fourth quarter >the first quarter, the area and seasonal variation of lake branch waters are the main factors affecting the comprehensive health status. The study can be used as the water in the end of the area.It provides scientific reference for connecting comprehensive renovation project.