| 引用本文: | 肖玉娜,程靖华,莫晓聪,李永蓉,刘晓娟,毕胜.丹江口水库浮游植物群落时空变化及其与环境因子的关系.湖泊科学,2023,35(3):821-832. DOI:10.18307/2023.0306 |
| Xiao Yuna,Cheng Jinghua,Mo Xiaocong,Li Yongrong,Liu Xiaojuan,Bi Sheng.Spatio-temporal variation of phytoplankton community and its relationship with environmental factors in Danjiangkou Reservoir. J. Lake Sci.2023,35(3):821-832. DOI:10.18307/2023.0306 |
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| 丹江口水库浮游植物群落时空变化及其与环境因子的关系 |
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肖玉娜1,2, 程靖华3, 莫晓聪1, 李永蓉1,2, 刘晓娟1,2, 毕胜1
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1.长江水利委员会长江科学院, 武汉 430010;2.武汉长江科创科技发展有限公司, 武汉 430010;3.南水北调中线水源有限责任公司, 十堰 442700
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| 摘要: |
| 研究丹江口水库在完成高水位蓄水期间浮游植物群落的时空动态特征可为丹江口水库的水质保护与生态系统结构优化及健康管理提供一定科学依据。本研究基于2018—2020年的水库浮游植物监测数据，结合同期水库水体的理化参数，分析了丹江口水库浮游植物在不同年度、季度及空间的变化特征，以及影响浮游植物群落结构变化的主要环境因子。结果显示该区域共检测出浮游植物7个门类，其中蓝藻门、硅藻门、绿藻门、隐藻门为优势类群。2018—2020年浮游植物年均密度分别为1.96×106、2.55×106和5.07×106 cells/L，呈现出逐年增高趋势。浮游植物季度密度表现为秋季>夏季>春季>冬季，在夏秋季节蓝藻门和绿藻门占优势，春冬季节硅藻门和隐藻门占优势，同时硅藻门在四季中均占据生长优势。空间上库区浮游植物密度明显高于支流，且汉江库区浮游植物密度高于丹江库区，其中蓝藻门和绿藻门主要在库区大量出现，而支流则以硅藻门和隐藻门为主。RDA分析显示，影响丹江口水库浮游植物的主要环境因子是水温，其次为化学需氧量、氨氮和总磷。在不同季节和不同库区影响浮游植物群落分布的主要环境因子有所不同，春季总氮为主要影响因子，夏季浮游植物群落受多个环境因子的共同作用，秋季总磷对浮游植物群落影响最大，冬季高锰酸盐指数为主要影响因子，丹江库区则主要受水温、pH、溶解氧等影响，汉江库区还受到总氮和总磷等营养元素的干扰。 |
| 关键词: 丹江口水库 浮游植物 环境因子 时空变化 |
| DOI：10.18307/2023.0306 |
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| 基金项目:中央级公益性科研院所基本科研业务费项目（CKSF2021466/TG8）资助。 |
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| Spatio-temporal variation of phytoplankton community and its relationship with environmental factors in Danjiangkou Reservoir |
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Xiao Yuna1,2, Cheng Jinghua3, Mo Xiaocong1, Li Yongrong1,2, Liu Xiaojuan1,2, Bi Sheng1
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1.Changjiang River Scientific Research Institute, Changjiang Water Resources Commission, Wuhan 430010, P. R. China;2.Wuhan Changjiang Kechuang Technology Development Co., Ltd., Wuhan 430010, P. R. China;3.South-to-North Water Diversion Project Midline Water Source Co. Ltd., Shiyan 442700, P. R. China
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| Abstract: |
| Research on the spatio-temporal dynamics characteristics of phytoplankton community in the Reservoir during the high-water storage period can provide a scientific basis for water quality protection, ecosystem structure optimization and health management in Danjiangkou Reservoir. Based on the monitoring data of phytoplankton and physical and chemical parameters of reservoir water from 2018 to 2020, this study analyzed the variation characteristics of phytoplankton in different years, seasons and spaces, together with the main environmental factors affecting the structure of phytoplankton in Danjiangkou Reservoir. The results showed that there were seven phyla in this region, among which the Cyanophyta, Bacillariophyta, Chlorophyta and Cryptophyta had relatively high abundance. The annual average density of phytoplankton showed an increasing trend from 1.96×106 cells/L in 2018, and 2.55×106 cells/L in 2019, to 5.07×106 cells/L in 2020. The seasonal density of phytoplankton was autumn > summer > spring > winter, and the Bacillariophyta had great advantages in the four seasons. In summer and autumn, Cyanophyta and Chlorophyta were dominant, while in spring and winter, Bacillariophyta and Cryptophyta were dominant. Spatially, the density of phytoplankton in the reservoir area was significantly higher than that in the tributaries, and in Hanjiang Reservoir was significantly higher than that in Danjiang Reservoir, in which Cyanophyta and Chlorophyta mainly appeared in the reservoir area, while the tributaries were dominated by Bacillariophyta and Cryptophyta. The RDA analysis showed that the main environmental factor affecting phytoplankton in Danjiangkou Reservoir was water temperature, followed by chemical oxygen demand, ammonia nitrogen and total phosphorus, which respectively played major roles in different seasons, for example total nitrogen in spring, total phosphorus in autumn, permanganate index in winter and many environmental factors together in summer. Spatially, the phytoplankton in Danjiang and Hanjiang Reservoirs were both affected by water temperature, pH, dissolved oxygen, that in Hanjiang Reservoir was also affected by nutrient elements such as total nitrogen and total phosphorus. |
| Key words: Danjiangkou Reservoir phytoplankton environmental factors temporal and spatial patterns |
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