摘要
近年来南水北调中线工程的水质保障和生态影响受到广泛关注,在中线缓流及回水区域逐渐出现淤积问题,其重要来源就是干渠中的悬浮物。针对此问题,在2020年11月及2021年7月对南水北调中线总干渠开展调查。研究结果表明,总干渠的悬浮物浓度及组成具有明显的时空差异,其中干渠北部受水区有机悬浮物浓度均显著高于无机悬浮物浓度。基于总干渠各类悬浮物浓度组成和浮游植物细胞密度进行广义可加模型的相关性分析,有机悬浮物浓度与浮游植物细胞密度呈显著正相关,说明浮游植物是有机悬浮物的重要成分。在此基础上对总干渠浮游植物群落开展调查,2020年11月蓝藻门的隐球藻密度最高,而硅藻门的颗粒直链藻是生物量最大的物种;2021年7月浮游植物密度要明显高于2020年11月,其中硅藻门具最大的生物量和较大的细胞密度,其次为蓝藻和绿藻,它们的生长繁殖与溶解氧、水温密切相关。综上所述,需要关注总干渠硅藻门物种的生长繁殖,以防止其提高有机悬浮物浓度进而影响总干渠北部区域的受水。
In recent years,the water resources security and ecological impact of the middle route of the South-to-North Water Diversion Project has been widely concerned,and the sedimentation problem gradually appears in the slow flow and backwater areas of the middle route,and the suspended solids is an important source in the main canal.To solve this problem,this study carried out research on the spatial distribution and dynamics of suspended solids in the main channel of the middle route of the South-to-North Water Diversion Project in November 2020 and July 2021.The concentration and composition of total suspended solids showed obvious spatial and seasonal differences.The concentration of volatile suspended solids was higher than that of non-volatile suspended solids in the north area of the water diversion channel.The generalized additive model was used to analyze the relation between phytoplankton cell density and suspended solids composition,the result showed the concentration of volatile suspended solids is significantly related to phytoplankton cell density,meaning phytoplankton account for a large proportion of volatile suspended solids.According to phytoplankton community analysis,Aphanocapsa sp and Melosira granulata were the dominant species in November 2020;Synedraacus and Aphanocapsa pulchra were the dominant species in July 2021.The cell density in July 2021 is higher than November 2020,the Bacillariophyta,Cyanophyta,Chlorophyta accounts for the largest proportion of biovolume and cell density in the community,they all positively correlated with dissolved oxygen and water temperature.Thus,it is necessary to pay attention to the growth and reproduction of Bacillariophyta species in the main canal to prevent them from increasing the concentration of volatile suspended solids and affecting the water receiving in the northern area of the main canal.
作者
任海平
段春建
张铁财
周旋
李书印
刘人杰
胡愈炘
REN Hai-ping;DUAN Chun-jian;ZHANG Tie-cai;ZHOU Xuan;LI Shu-yin;LIU Ren-jie;HU Yu-xin(Henan Branch,Construction Administration Bureau of the Middle Route of South-North Water Diversion Project,Zhengzhou 450018,China;Ecological Environment Monitoring and Scientific Research Center of Yangtze River Basin Ecology and Environment Administration,Ministry of Ecology and Environment of the people’s republic of China,Wuhan 430010,China)
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2022年第11期2473-2480,共8页
Resources and Environment in the Yangtze Basin
基金
南水北调中线输水水质预警与业务化管理平台(2017ZX07108-001)。
关键词
南水北调中线
悬浮物组成
粒径分析
浮游植物群落
the middle route of the South-to-North Water Diversion Project
suspension composition
particle size analysis
phytoplanktoncommunity
作者简介
任海平(1981-),男,高级工程师,主要研究方向为应用化学.E-mail:renhaiping@nsbd.cn;通讯作者:胡愈炘,E-mail:ssshyx@163.com。
