香溪河营养盐时空分布趋势研究  

Variation of Temporal and Spatial Distributions of Nutrients in Xiangxi Bay(2008-2015)

作　　者：桑文璐 杨霞[2] 宋林旭[1] 纪道斌[1] 龙良红[1] 李欣[1] SANG Wen-lu;YANG Xia;SONG Lin-xu;JI Dao-bin;LONG Liang-hong;LI Xin(College of Hydraulic ＆ Environmental Engineering,China Three Gorges University,Yichang 443002,P.R.China;Three Gorges Construction and Operation Management Department of China Three Gorges Corporation,Yichang 430068,P.R.China)

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002 [2]中国长江三峡集团公司三峡枢纽建设运行管理局,湖北宜昌443133

出　　处：《水生态学杂志》2018年第4期38-45,共8页Journal of Hydroecology

基　　金：国家重点基础研究发展计划(973)项目(2014CB460601);国家科技合作与交流专项项目(2014DFE70070);国家自然科学基金青年基金项目(51509086)

摘　　要：为研究近年来香溪河库湾营养盐分布特征及营养化程度,于2008-2015年春季水华敏感期对三峡水库香溪河库湾进行水环境监测,使用改进的综合营养状态指数法与主成分分析法对其水体营养化状况进行分析和评价。结果表明,香溪河库湾TN、TP浓度从香溪河上游到河口的纵向分布规律明显,TN浓度从上游至下游河口呈现逐渐递增的趋势,TP浓度从上游至下游河口呈逐渐递减的趋势;透明度为0.6~6.0m,香溪河库湾TN浓度为0.21~1.87mg/L;TP浓度为0.04~0.37mg/L;Chl-a含量为0.53~184.61μg/L,2种评价结果基本一致。从时间上看,香溪河库湾富营养化程度是上游〉中游〉下游;从年际上看,水库蓄水过程能够临时降低水库干支流水体中的营养盐浓度,但增大了来年支流水体富营养化的风险,可见未来的香溪河富营养化问题将持续存在。Xiangxi Bay （XXB） is a typical tributary of Three George Reservoir （TGR）. In order to study the nutrient levels and distribution of XXB in recent years, water quality monitoring XXB was conducted each spring from 2008 to 2015. The comprehensive trophic level index （TLI） method and principal component analysis were used to assess the degree of nutrient enrichment. Results showed： The longitudinal distribution of TN and TP from the upper reaches to the estuary of XXB changed significantly; from the upstream to the estuary, TN increased and TP decreased. Water quality parameter ranges were as follows： TN, 0.21-1.87 mg/L; TP, 0.04-0.37 mg/L, Chl-a, 0.53-184.61 μg/L and transparency, measured as Secchi depth, 0.6 -6.0 m. The results of two evaluation methods were similar. The degree of eutrophication in XXB follows the order, upstream〉midstream〉downstream. Water storage in reservoirs will tem- porarily reduce the nutrient concentrations in the main stream and tributaries of the reservoir, but increases the risk of eutrophication in tributaries and XXB eutrophication will likely continue in the foreseeable future.

关 键 词：三峡库区 香溪河 富营养化 综合营养状态指数法 主成分分析法 

分 类 号：Q176[生物学—水生生物学]