Eutrophication development and its key regulating factors in a water-supply reservoir in North China

作     者：Liping Wang Lusan Liu Binghui Zheng 

作者机构：State Environmental Protection Key Laboratory of Estuary and Coastal EnvironmentChinese Research Academy of Environmental Sciences 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2013年第25卷第5期

页      面：962-970页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081504[工学-水利水电工程] 08[工学] 0815[工学-水利工程] 

基　　金：supported by the Plan of the National SciTech Major Special Item for Water Pollution Control and Management (No. 2009ZX07528-003) 

主　　题：eutrophication trophic state cyanobacterial bloom limiting factors water-supply reservoir 

摘      要：Yanghe Reservoir is an important source of drinking water for Qinhuangdao City,North China;however,in recent decades this water source has been eutrophic with recurrent summer cyanobacterial *** trophic grade of the system in summer was mesotrophiceutrophic in 1990 and became hypertrophic in *** nutrient availability is extremely high during the entire year,and the water temperature should be the primary driver of the summer *** May-October of 2010 and 2011,abrupt variations were observed in the Secchi depth（SD） and chlorophyll a（Chl-a）,and both the correlated analysis of Chl-a-SD and trophic status indices（TSI） deviation（TSI Chl-a-TSI SD） showed that algal cell density dominated light *** the algal bloom outbreak,the microcystin concentration was found to vary between 0.35-2.12 μg/L in 2010 and 0.11-1.86 μg/L in *** maximum microcystin content was more than two times the safety limit required for drinking *** discharges were most concentrated in the summer,with periods of lower residence time and the largest water level fluctuation over the entire *** a high availability of nutrients promoted a high Chl-a concentration in the whole system,it appeared that the instability caused by the decrease in residence time could not produce effective changes in the cyanobacterial *** results indicated that nutrient enrichment in the aquatic systems of Yanghe Reservoir is the most serious problem and that the status would not been modified effectively by increasing hydrological fluctuations（e.g.,decreasing the residence time）.Therefore,decreasing the nutrient concentrations is the only route to improve the water quality of this reservoir.