水温分层对三峡水库香溪河库湾春季水华的影响  

Effects of Thermal Stratification on Spring Blooms in Xiangxi Bay of the Three Gorges Reservoir

作　　者：刘流[1] 刘德富[1] 肖尚斌[1] 孔松[1] 陈媛媛[1] 方小凤[1] 

机构地区：[1]三峡大学水利与环境学院三峡库区生态环境教育部工程中心,宜昌443002

出　　处：《环境科学》2012年第9期3046-3050,共5页Environmental Science

基　　金：国家杰出青年科学基金项目(50925932);国家自然科学基金项目(51179095);国家自然科学基金青年基金项目(51009080,51009081);国家水体污染控制与治理科技重大专项(2009ZX07104-001,2008ZX07104-004,2008ZX07104-003-03);“十一五”国家科技支撑计划项目(2008BAB29B09);湖北省环保科技项目(2008HB08)

摘　　要：三峡水库蓄水以来,其支流库湾年复一年暴发严重的春季水华.为找出支流库湾春季水华的关键影响因子,2010年春季对三峡水库库首最大的支流香溪河库湾进行了原位定点连续监测,主要监测指标包括水温、水体透明度、水下光照及营养盐浓度等环境因子.结果表明,春季水温分层发育导致水体混合层深度突然减小是春季水华暴发的直接诱因,真光层与水体混合层之比(Zeu/Zmix)与叶绿素a(Chl-a)的皮尔逊相关系数达0.934(P<0.01).表明Critical Depth模型可用于解释三峡水库典型支流库湾水华生消机制.本研究将为三峡水库支流库湾水华预报及防治提供重要参考.Frequent spring blooms have been observed in tributary bays of the Three Gorges Reservoir（TGR） since its initial filling.In order to identify the primary factor controlling spring blooms,a field monitoring plan was carried out in Xiangxi Bay,the largest tributary of TGR head area in spring 2010.The environmental factors such as water temperature,Secchi depth,underwater illumination and nutrients were monitored.The results showed that the sudden decrease of mixing depth resulting from the development of thermal stratification was the direct and primary contributor to the onset of spring blooms（Pearson correlation coefficient of the ratio of euphotic depth to mixing depth（Zeu/Zmix） and chlorophyll-a（Chl-a） is 0.934,P〈0.01）.The significant response of spring blooms to thermal stratification indicates that Critical Depth model can be applied to tributary bays of TGR,which will provide important references for the investigators and managers who are working on the prediction and control of algal blooms in the bays.

关 键 词：三峡水库 水体富营养化 春季水华 水温分层 水体混合层深度 

分 类 号：X52[环境科学与工程—环境工程]