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引用本文:郭诗君,王小军,韩品磊,郑保海,蒋叶青,郭坤,韩雪梅,李百炼,高肖飞,李玉英.丹江口水库叶绿素a浓度的时空特征及影响因子分析.湖泊科学,2021,33(2):366-376. DOI:10.18307/2021.0206
Guo Shijun,Wang Xiaojun,Han Pinlei,Zheng Baohai,Jiang Yeqing,Guo Kun,Han Xuemei,Li Bailian,Gao Xiaofei,Li Yuying.Spatiotemporal characteristics of layered chlorophyll-a concentration and influencing factors in Danjiangkou Reservoir. J. Lake Sci.2021,33(2):366-376. DOI:10.18307/2021.0206
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丹江口水库叶绿素a浓度的时空特征及影响因子分析
郭诗君1, 王小军2, 韩品磊2, 郑保海1, 蒋叶青1, 郭坤1,3, 韩雪梅1, 李百炼1,4, 高肖飞5, 李玉英1
1.南阳师范学院水资源与环境工程学院, 河南省南水北调中线水源区流域生态安全国际联合实验室, 南水北调中线水源区水安全河南省协同创新中心, 南阳 473061;2.南水北调中线干线工程建设管理局渠首分局, 南阳 473000;3.奥尔胡斯大学生物科学系, 奥尔胡斯 8000, 丹麦;4.加州大学河滨分校环境科学系, 河滨CA 92521, 美国;5.中国科学院城市环境研究所, 城市环境与健康重点实验室, 水生态健康研究组, 厦门 361021
摘要:
2017年5月-2019年10月,对"南水北调"中线水源水库——丹江口水库库区水体7个监测位点、0~20 m间4个水层的垂向叶绿素a(Chl.a)浓度与水质因子进行了季度性调查,以期了解不同位点、不同水层Chl.a分布的主要驱动因子.结果表明,丹江口水库各位点营养状态指数(TSI)均为中营养化状态.水体Chl.a浓度具有逐年增加的趋势,且极高值有逐渐增加的趋势.营养盐和Chl.a浓度均存在较大的空间异质性,入库区具有较高的总磷和氨氮浓度,汉江库区具有最高的Chl.a浓度,源头污染源控制和监测仍然是丹江口水库管理的重中之重.不同位点Chl.a浓度的驱动因子存在较大差异,汉江入库和大坝区Chl.a浓度分别受到硝态氮和pH的影响,而出水口大坝位点主要受到了水深、水温和氨氮的影响.丹江入库区Chl.a浓度受到了水深、氨氮、总磷和水温的影响,但丹江库区表现出了与其他生态区较大的区别,其Chl.a浓度主要受到水深和有机质输入的影响.因此,对丹江口水库各位点的管理,应该分不同生态区采取针对性的管理措施.本研究旨在为南水北调中线工程可持续的生态调度提供基础生态数据支持,为完善水库水源地的有效管理提供理论支撑.
关键词:  丹江口水库  叶绿素a  影响因子  偏Mantel分析  营养状态指数
DOI:10.18307/2021.0206
分类号:
基金项目:国家自然科学基金项目(51879130,U1704124,41601332)和河南省重点科技攻关项目(2016151,17454,182102311021)联合资助.
Spatiotemporal characteristics of layered chlorophyll-a concentration and influencing factors in Danjiangkou Reservoir
Guo Shijun1, Wang Xiaojun2, Han Pinlei2, Zheng Baohai1, Jiang Yeqing1, Guo Kun1,3, Han Xuemei1, Li Bailian1,4, Gao Xiaofei5, Li Yuying1
1.School of Water Resources and Environment Engineering, Nanyang Normal University and International Joint Laboratory of Watershed Ecological Security and Collaborative Innovation Center of Water Security for Water Source Region of Middle Route Project of South-North Water Diversion in Henan Province, Nanyang Normal University, Nanyang 473061, P. R. China;2.Qushou Branch Bureau of Construction and Administration Bureau of Middle Route Project of South-North Water Division, Nanyang 473000, P. R. China;3.Department of Bioscience, Aarhus University, Aarhus 8000, Denmark;4.Department of Environmental Sciences, University of California, Riverside, Riverside CA 92521, USA;5.Aquatic Ecohealth Group, Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, P. R. China
Abstract:
The study was carried out at 4 vertical water layers among the 0-20 m water layer of 7 horizontal monitoring stations seasonally during May 2017-October 2019 in Danjiangkou Reservoir of the Middle Route Project of South to North Water Diversion in China, and explored the key drivers of the changes in chlorophyll-a (Chl.a) along with different water layers of different sampling stations. Based on the trophic state index (TSI), we found that all sites in the Danjiangkou Reservoir were mesotrophic water bodies. We found a trend of increase in Chl.a concentration in the Danjiangkou Reservoir, and the extreme concentrations were likely increasing yearly. The nutrient and Chl.a concentration showed temporal and spatial changes in the Danjiangkou Reservoir. The upstream of the reservoir area has higher total phosphorus and ammonia nitrogen concentrations, the Hanjiang Reservoir has the highest Chl.a concentration. Therefore, source pollution control and monitoring are still the top priority of Danjiangkou Reservoir management. The important drivers of Chl.a concentration varied among different sites. The Chl.a concentration in the upstream of Hanjiang River and the dam area are affected by nitrate nitrogen and pH, respectively, while the dam site of the outlet is mainly affected by water depth, water temperature and ammonia nitrogen. The Chl.a concentration in the upstream of Danjiang Reservoir is affected by water depth, nitrogen nutrients, total phosphorus and water temperature, but the Chl.a concentration in the Danjiangkou Reservoir was mainly affected by water depth and organic matter input. Therefore, the management of each site of the Danjiangkou Reservoir should be divided into different ecological zones and adopt the right management measurements. This study aims to provide basic ecological data for the sustainable ecological scheduling of the South-to-North Water Diversion Middle Route Project and provide a theory for improving the management of reservoirs.
Key words:  Danjiangkou Reservoir  chlorophyll-a  environmental factors  principal component analysis  partial Mantel analysis  trophic state index
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