三峡水库香溪河库湾夏季水华调查  

An investigation on summer algal blooms in Xiangxi Bay of Three Gorges Reservoir

作　　者：许涛[1] 王雨春[2] 刘德富[1,3] 杨正健[1] 陈文重[1] 吴娅[1] 

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002 [2]中国水利水电科学研究院,北京100038 [3]三峡库区生态环境教育部工程研究中心,三峡大学,湖北宜昌443002

出　　处：《生态学杂志》2014年第3期646-652,共7页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(51179205);"十二五"国家水体污染防治重大科技专项(2012ZX07104-01)资助

摘　　要：以三峡水库支流香溪河为研究对象,以2011年夏季的采样数据为基础,比较分析了水华前后支流库湾营养盐和叶绿素a的时空分布规律及其相关性。结果表明,2011年6月21—29日,香溪河暴发了显著的藻类水华,叶绿素a峰值达到125.8 mg·m-3。相关分析表明,水华过程显著影响可溶性无机N、P的空间分布,营养盐空间分布从中游高、河口低,转变为从河口至上游递减,并且在水华区域锐减;长江干流较高的营养盐本底值增大了支流库湾水华的风险;高营养盐背景值的长江干流水体在香溪河库湾的潜出位置是水华最严重的区域;干流水体对库湾表层的营养盐补给作用是影响库湾水华生消的关键因素。Taking Xiangxi River, a tributary of the Three Gorges Reservoir as the study object, and according to the monitoring data obtained in summer of 2011, the temporal and spatial distri- bution characteristics of nutrients and chlorophyll a in the tributary bay before and after an algal bloom, and their relevance were analyzed. The results showed that the algal bloom lasted during June 21-29, 2011, and the maximal value of chlorophyll a achieved 125.8 mg ·m^-3. The algal bloom had a significant influence on the spatial distribution of DIN and DIP, and the nutrients were at high concentrations in middle reaches, and low concentrations in the estuary, but dimin- ished from the estuary to the upper reaches, and sharply declined in the algal bloom area. The high background concentrations of nutrients in Yangtze River increased the risk of algal blooms in the tributary bay. The outflow position of the Yangtze River water with high background concen- trations of nutrients in the Xiangxi River bay was just the region with the most severe algal bloom. The nutrient supply of mainstream water to the tributary bay surface water was the key factor af- fecting the algal bloom fluctuation.

关 键 词：营养盐 叶绿素A 相关分析 

分 类 号：X524[环境科学与工程—环境工程]