丹江口水库不同水文期真光层深度特征及影响因素分析  

VARIATION AND INFLUENCING FACTORS OF EUPHOTIC DEPTH IN DANJIANGKOU RESERVOIR IN DIFFERENT HYDROLOGICAL PERIODS

作　　者：屈月明 蔡庆华[1] 申恒伦[1,2] 李斌[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,湖北武汉430072 [2]中国科学院大学,北京100049

出　　处：《长江流域资源与环境》2014年第1期53-59,共7页Resources and Environment in the Yangtze Basin

基　　金：水利部公益性行业科研专项经费项目(201101001);国家重点实验室专项经费项目(2011FBZ02)

摘　　要：丹江口水库是南水北调中线工程的引用水源地。于2011～2012年对水库不同水文期的水下光合有效辐照度及引起光衰减的3种主要物质（无机颗粒悬浮物、藻类叶绿素a、溶解性有机碳）进行调查，分析了真光层深度的时空动态及影响因素。结果表明，丹江口水库真光层深度的变化范围为：1．036～15．350m；丰水期、平水期和枯水期的均值分别为：6．084m、5．353m、7．647m。丹江库区、汉江库区沿库尾至坝前均有上升的趋势。在丹江库区的敞水区真光层深度较大，水质较好。逐步回归分析表明，丹江口水库水体真光层深度主要受到无机颗粒悬浮物及浮游植物影响，但在不同水期、不同库区影响因素表现不同：在丰水期、平水期，无机颗粒物与浮游植物对真光层深度的深浅起主导作用；枯水期真光层深度波动不大，其主要影响因素为藻类叶绿素a与溶解性有机碳。The Danjiangkou reservoir, located in the junction area of Hubei Province, Henan Province, and Shanxi Province, is the only water source of the Central Line Project of South-to-North Water Diversion of China, which serves as an important drinking water source for most cities facing severe water shortage in the North China Plain （e.g. Beijin, Tianjin, Shijiazhuang）. Understanding the ecological condition of the Danjiangkou reservoir is a valuable knowledge for the regional water resource protection and management. Euphotie depth is one of the most important factors to assess the condition of the aquatic ecosystem because it represents a zone where almost all of the primary production occurs. Investigating the variation of euphoric depth in Danjiangkou reservoir and assessing the influencing factor can improve our understanding on the ecosystem dynamics of the Danjiangkou reservoir and its relationships with light. Relevant results could provide useful information for the sustainable water resource management of South-to-North Water Diversion. To investigate the spatio-temporal dynamics of euphoric depth and its influencing factors, a total of 25 field sampling sites were investigated during the high flow period, median flow period, and low water period in 2011- 2012 in the Danjiangkou Reservoir. First, we investigated the spatiotemporal variations of the underwater photosynthetic active radiation and the concentration of three main substances （inorganic suspended particulate, algal chlorophyll a, dissolved organic carbon）. Then, we used the step- wise multiple regression analysis to determine the most important factors affect the variation of euphotic depth in the Danjiangkou Reservoir. The results showed that, the euphoric depth of the Danjiangkou Reservoir range from 1.04 m to 15.35 m, with average values of 6.08 m, 5.35 m, and 7.65 m in the high flow period, median flow period, and low flow period, respectively. In the temporal scale, the highest fluctuation of the euphoric depth was observed in the hi

关 键 词：丹江口水库 真光层深度 无机颗粒悬浮物 藻类叶绿素a 溶解性有机碳 

分 类 号：F590[经济管理—旅游管理]