摘要
作为三峡库区生态调节前置库,汉丰湖水质受流域内农业面源污染和城市生活污染的影响。开展汉丰湖正式运行前后流域水环境演变特征分析研究,明确影响水体营养状态的关键因素,对汉丰湖水环境保护乃至改善三峡库区水环境具有重要的参考意义。本研究综述了2012—2019年汉丰湖水质监测数据相关文献,各指标的质量浓度监测结果表明:溶解氧(DO)、总磷(TP)和高锰酸钾指数(COD_(Mn))年变化较大,总磷(TN)、氨氮(NH_(4)^(+)-N)年浓度差异不显著;TN和NH_(4)^(+)-N随着月份增加整体呈下降趋势,DO、COD_(Mn)和叶绿素a(Chla)随着月份增加整体呈先增加后降低趋势,TP随月份增加整体呈先降低后增加的趋势;各监测点位的水体DO、TN、NH_(4)^(+)-N、TP和COD_(Mn)质量浓度差异均不显著。汉丰湖水体质量等级为Ⅲ至劣Ⅴ类,呈中营养至轻度富营养状态,TN是主要污染指标。Chla与DO、TN呈显著正相关,与NH_(4)^(+)-N呈正相关,与COD_(Mn)和TP呈负相关关系,藻类的生长与溶解氧、氮素含量增加有关。为改善汉丰湖的水体富营养化问题,本文提出了污染源控制、水文调度和生态补偿措施。
As a pre-reservoir in the Three Gorges Reservoir area,Hanfeng Lake’s water quality is affected by agricultural non point source pollution and urban domestic pollution in the basin.It has important reference values for the water environmental pro⁃tection of Hanfeng Lake and even for the water environment improvement of the Three Gorges Reservoir area to analyze the evolu⁃tion characteristics of the Hanfeng water environment before and after the operation of the ecological regulation dam and to clarify the key factors affecting the nutritional status of the water body.This research summarizes the water quality monitoring data of Han⁃feng Lake from 2012 to 2019.The results show that the mass concentrations of Dissolved Oxygen(DO),Total Phosphorus(TP)and Permanganate Index(COD_(Mn))increased year by year,while those of TN and NH_(4)^(+)-N showed no significantly changes.During a course of year,the mass concentrations of TN and Ammonia Nitrogen(NH_(4)^(+)-N)increased monthly,while those of COD_(Mn) and Chloro⁃phyllα(Chla)increased first and then decreased,and that of TP decreased first and then increased.The differences of DO,TN,NH_(4)^(+)-N,TP and COD_(Mn) at various locations were insignificant.The water quality grade of Hanfeng Lake isⅢ-Ⅴinferior,with a state of moderate nutrition and mild eutrophication.Total nitrogen is the main pollution indicator of Hanfeng Lake.Measures for pollution sourcecontrol,hydrological regulationand ecological compensation are proposedfor governing the eutrophication of HanfengLake.
作者
刘文祥
卢阳
张乾柱
倪鸣
周火明
LIU Wenxiang;LU Yang;ZHANG Qianzhu;NI Ming;ZHOU Huoming(Chongqing Branch Institute,Changjiang River Scientific Research Institute of Changjiang Water Resources Commission,Chongqing 400026,China)
出处
《三峡生态环境监测》
2022年第2期23-31,共9页
Ecology and Environmental Monitoring of Three Gorges
基金
中央级公益性科研院所基本科研业务费项目(CKSF2021464/CQ)
中央级公益性科研院所基本科研业务费项目(CKSF2019413/CQ)。
关键词
汉丰湖
水质指标
时空变化
水环境演变
治理
Hanfeng Lake
water quality index
temporal and spatial changes
water environment evolution
governance
