三峡水库神农溪库湾水体季节性分层特性

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英文篇名：Seasonal stratification of waters in the Shennong Stream of the Three Gorges Reservoir 作者：霍静 ; 崔玉洁 ; 宋林旭 ; 刘德富 ; 纪道斌 ; 黄佳维 ; 王耀耀 英文作者：HUO Jing;CUI Yu-jie;SONG Lin-xu;LIU De-fu;JI Dao-bin;HUANG Jia-wei;WANG Yao-yao;College of Hydraulic and Environmental Engineering,China Three Gorges University;Engineering Research Center of Eco-environment in Three Gorges Reservoir,Ministry of Education,China Three Gorges University; 关键词：神农溪 ; 层化结构 ; 溶解氧 ; 水温 英文关键词：Shennong Stream;;stratified structure;;dissolved oxygen;;water temperature 中文刊名：生态学杂志 英文刊名：Chinese Journal of Ecology 机构：三峡大学水利与环境学院;三峡库区生态环境教育部工程研究中心; 出版日期：2018-12-27 14:15 出版单位：生态学杂志 年：2019 期：04 基金：国家自然科学基金重大计划项目(91647207);国家自然科学基金项目(51779128、51509086和41501297)资助 语种：中文; 页：242-250 页数：9 CN：21-1148/Q ISSN：1000-4890 分类号：X524

摘要

三峡水库蓄水后,较大程度改变了支流库湾原有河流生态环境。本研究对神农溪库湾2016年水温、溶解氧、叶绿素等指标垂直分层结构和季节演替规律进行分析。结果表明:神农溪库湾表层水温全年变化在10.6～32.4℃,库湾水体水温层化结构受水动力条件影响较大;春季受干流表层倒灌异重流影响水温呈"阶梯"型分布,夏季受干流中层倒灌异重流影响水温呈"双混斜"型分布,秋冬季受底层倒灌异重流影响水温呈"半U"型分布;水温分层结构对溶解氧和叶绿素垂直剖面变化有一定的影响,春夏季节水体溶解氧出现显著的分层现象,春季溶解氧分布受叶绿素a影响显著,夏季受水温影响显著。本研究将为分析三峡水库支流神农溪库湾生境条件变化提供数据支撑,为库区水环境管理与水资源利用提供科学依据。
        The ecological environment of Shennong Stream has been greatly changed since the impoundment of the Three Gorges Reservoir.The vertical stratification and seasonal variation of water temperature(WT),dissolved oxygen(DO),and chlorophyll-a(chl-a) were measured by field monitoring in Shennong Stream in 2016.The results showed that the surface water temperature varied from 10.6 ℃ to 32.4 ℃.The water temperature structure was greatly affected by the hydrodynamic conditions.The vertical water temperature structure was"stepped"in spring under the reverse current density from the surface of mainstream,"double-mixed"distribution in summer under the reverse current density from the middle of mainstream,and was changed into"half a U-shape"in autumn and winter under the reverse current density from the bottom of mainstream.The vertical distribution of DO and chl-a concentration was affected by water temperature stratification.The DO was significantly stratified in spring and summer.The vertical distribution of DO was affected by chl-a concentration in spring and by water temperature in summer.Our results provide reference for analyzing the change of habitat conditions of Shennong Stream and for water environment management and water resources utilization in the Three Gorges Reservoir area.

引文

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