三峡水库香溪河库湾夏季藻类水华的时空动态及其影响因素  

Spatiotemporal dynamics and related affecting factors of summer algal blooms in Xiangxi Bay of Three Gorges Reservoir

作　　者：王岚[1,2] 蔡庆华[1] 张敏[1,2] 谭路[1,2] 徐耀阳[1,2] 孔令惠[1,2] 

机构地区：[1]中国科学院水生生物研究所淡水生态与生物技术国家重点实验室,武汉430072 [2]中国科学院研究生院,北京100049

出　　处：《应用生态学报》2009年第8期1940-1946,共7页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(40671197);中国科学院知识创新工程重要方向性项目(KZCX2-YW-427);国家重点实验室专项经费项目(2008FBZ02)资助

摘　　要：2008年6—8月,三峡水库香溪河库湾相继暴发蓝藻和绿藻水华.依据香溪河库湾夏季的每周监测,对研究区2次水华分别进行聚类和判别分析,研究了2次水华的时空动态及其影响因素.结果表明:研究区2次水华过程均可划分为无水华组、过渡组和水华组;2次水华的暴发对可溶性硅(DSi)、硝态氮与亚硝态氮(NO3--N+NO2--N)和磷酸盐(PO43--P)3种营养盐的吸收程度不同;蓝藻水华暴发期间的DSi、总氮/总磷(TN/TP)、DSi/TN和DSi/TP值均低于绿藻水华;判别蓝藻水华暴发的参数为叶绿素a(Chla)、TN和PO43--P,而Chla和DSi则是绿藻水华暴发的判别因子,将2次水华过程划分为水华组和无水华组的判别效果更好;判断蓝藻和绿藻水华暴发的叶绿素a临界浓度分别为40和20μg·L-1.In June - August 2008, the cyanobacterial bloom and chlorophycean bloom broke out one after the other in the Xiangxi Bay of Three Gorges Reservoir. Based on the weekly monitoring in summer in the Bay, and by using cluster analysis and discriminant analysis, the spatiotemporal dynamics and related affecting factors of the two blooms were studied. Each of the blooms could be divided into non-bloom group, transitional group, and bloom group. The two blooms had different uptake levels of dissolved Si （ DSi）, NO3^- -N ＋ NO2 ^- -N, and PO4^3- -P. Cyanobacterial bloom had lower DSi concentration and lower TN/TP, DSi/TN and DSi/TP ratios than chlorophycean bloom. The discriminant factors of cyanobacterial bloom were Chl a, TN and PO4^3--P, while those of chlorophycean bloom were Chl a and DSi. Better discriminant results were obtained when dividing each bloom into non-bloom group and bloom group. The critical value of Chl a for cyanobacterial bloom and chlorophycean bloom was 40 and 20 μg · L^-1, respectively.

关 键 词：蓝藻水华 绿藻水华 聚类分析 判别分析 三峡水库 香溪河库湾 

分 类 号：X524[环境科学与工程—环境工程]