引用本文:龚川,贡丹丹,刘德富,等.不同光照强度下香溪河浮游植物演替过程研究[J].环境科学研究,2020,33(5):1214-1224.
GONG Chuan,GONG Dandan,LIU Defu,et al.Phytoplankton Succession Process in Xiangxi River under Different Light Intensity[J].Research of Environmental Sciences,2020,33(5):1214-1224.]
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不同光照强度下香溪河浮游植物演替过程研究
龚川1, 贡丹丹1,2, 刘德富1, 张佳磊1, 严广寒1,3
1. 湖北工业大学土木建筑与环境学院, 河湖生态修复与浮游植物利用湖北省重点实验室, 湖北 武汉 430068;2. 长江科学院流域水环境研究所, 流域水资源与生态环境科学湖北省重点实验室, 湖北 武汉 430010;3. 中国环境科学研究院, 湖泊水污染治理与生态修复技术国家工程实验室, 国家环境保护饮用水水源地保护重点实验室, 北京 100012
摘要:
为丰富三峡水库浮游植物演替机制,为三峡水库“潮汐式”调度提供理论依据和基础数据,基于前期香溪河水华易发区现场监测结果,其水下光照强度变化范围为1 800~17 000 lx,据此开展不同梯度恒定光照条件下香溪河源水混合浮游植物群落演替过程的室内控制试验.结果表明:①按照R*法则和关键光强假说,在其他环境条件适宜的情况下,光照为4 500 lx时,香溪河源水中混合浮游植物的生物量和多样性最高.②CSR理论(Competitor-Stress Tolerator-Ruderals Theory)中的浮游植物环境适应机制及生长策略不能准确解释不同梯度恒定光照控制条件下浮游植物的演替规律.光照条件是影响浮游植物群落演替方向的关键要素,而演替方向由群落发生演替时的光照条件与该群落中藻种关键光强的匹配程度决定.③香溪河源水中混合藻种的不同梯度恒定光照控制试验结果显示,小球藻(Chlorella sp.)、衣藻(Chlamydomonas sp.)、栅藻(Scenedesmus sp.)、肾形藻(Nephrocytium sp.)、微囊藻(Microcystis sp.)、色球藻(Chroococcus sp.)、隐藻(Cryptomonas sp.)和小环藻(Cyclotella sp.)的最适光强分别为3 000、8 000、13 000、6 000、6 000、13 000、13 000和6 000 lx.研究显示,将光照控制在合适的阈值范围,有助于维持浮游植物的多样性,对水华防治具有重要意义.
关键词:  关键光强假说  最适光强  R*法则  水华防控机制
DOI:10.13198/j.issn.1001-6929.2020.04.01
分类号:X524
基金项目:国家水体污染控制与治理科技重大专项(No.2017ZX07101003-008);三峡工程运行对洞庭湖水环境影响及保护技术研究(No.2017HXXY-05);国家科技合作与交流专项(No.2014DFE70070)
Phytoplankton Succession Process in Xiangxi River under Different Light Intensity
GONG Chuan1, GONG Dandan1,2, LIU Defu1, ZHANG Jialei1, YAN Guanghan1,3
1. Key Laboratory of Ecological Remediation of Lakes and Rivers and Algal Utilization of Hubei Province, School of Civil Architecture and Environmental Engineering, Hubei University of Technology, Wuhan 430068, China;2. Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Basin Water Environment Department, Changjiang River Scientific Research Institute, Wuhan 430010, China;3. State Environmental Protection Key Laboratory of Drinking Water Source Protection, National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
Abstract:
In order to enrich the phytoplankton succession mechanism of the Three Gorges Reservoir and provide a theoretical basis and basic data for the ‘tidal’ operation of the Three Gorges Reservoir, based on early field monitoring results in the water bloom prone area of the Xiangxi River, underwater light intensity ranges from 1,800 to 17,000 lx, and combined with the field monitoring results, indoor control experiments on the succession process of mixed phytoplankton community in the source water of the Xiangxi River under different gradient and constant illumination conditions were carried out. The results showed that: (1) According to the R* rule and the key light intensity hypothesis, under other appropriate environmental conditions, the biomass and diversity of mixed phytoplankton in the source water of the Xiangxi River were the highest when the light was 4,500 lx. (2) The mechanism and growth strategy of phytoplankton environmental adaptation in Competitor-Stress Tolerator-Ruderals Theory cannot accurately explain the rules of phytoplankton succession under different gradient constant illumination control conditions. The illumination condition was the key factor affecting the succession direction of the community, which was determined by the matching degree of the light condition and the key light intensity of the algae species in the community at that time. (3) The results of different gradient constant light control experiments of mixed algae species in the source water showed that the optimal light intensities for Chlorella sp., Chlamydomonas sp., Scenedesmus sp., Nephrocytium sp., Microcystis sp., Chroococcus sp., Cryptomonas sp. and Cyclotella sp. respectively were 3,000, 8,000, 13,000, 6,000, 6,000, 13,000, 13,000 and 6,000 lx. This study shows that controlling the light in the appropriate threshold range is helpful to maintain the diversity of phytoplankton and is important for preventing and controlling water blooms.
Key words:  key light intensity hypothesis  optimum light intensity  R* rule  water bloom prevention and control mechanism