三峡水库支流回水区富营养化时空分布特征  

Space-Time Distribution of Eutrophication in Backwater Zones of Branch Rivers in the Three Gorges Reservoir

作　　者：刘玉洁[1] 尹真真[1] 

机构地区：[1]重庆市环境科学研究院,重庆401147

出　　处：《环境保护科学》2014年第2期30-34,共5页Environmental Protection Science

基　　金：国务院三峡办长江三峡工程生态与环境监测系统重点项目(SX2011-008)基金资助

摘　　要：为了解三峡水库175 m水位蓄水后库区支流回水区富营养化现状,探索支流回水区富营养化时空变化规律,在三峡库区支流回水区开展了富营养化普查和监测.结果表明,库区支流总磷浓度为0.035～0.65 mg/L,平均浓度为0.157 mg/L,总氮浓度为0.681～5.690 mg/L,平均浓度为2.037 mg/L,远远高于湖库水体出现富营养化的总磷和总氮临界浓度0.02、0.2 mg/L,库区支流营养盐条件适宜藻类生长.在每年4～9月的春季、盛夏和夏秋之交的非暴雨时段,当气温和光照适宜,支流回水核心区富营养化现象明显,出现藻类“疯长”的水华现象,但受气温变化影响明显,库区的富营养化现象仍是间歇的,局部的.In order to master the status of eutrophication and the space-time distribution,investigation and monitoring is carried out in backwater zones of branch rivers in the Three Gorges Reservoir.The investigation results show that,in the branch rivers,total phosphorus （TP） is 0.035～0.65 （mean 0.157） mg/L and total nitrogen （TN） is 0.681～5.690 （mean 2.037） mg/L,which are far higher than the critical concentrations of 0.02 mg/L and 0.2 mg/L,respectively.The nutritive salt conditions in the watershed are favorable for algal growth.During the non-rainstorm periods in spring,summer and the summer-fall transition from April to September,when temperature and daylight are suitable,severe eutrophication occurs in the backwater zones of branch rivers,accompanied by algal bloom when algae ＂crazy＂ grow.However,the eutrophication can be affected by temperature changes,so eutrophication in the watershed is intermittent and locally distributed.

关 键 词：三峡水库 回水区 富营养化 时空分布 

分 类 号：X522[环境科学与工程—环境工程]