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学科主题: Environmental Sciences
题名: Ammonium, microcystins, and hypoxia of blooms in eutrophic water cause oxidative stress and C-N imbalance in submersed and floating-leaved aquatic plants in Lake Taihu, China
作者: Zhang, Meng ; Wang, Zhengqi ; Xu, Jun ; Liu, Yaqin ; Ni, Leyi ; Cao, Te ; Xie, Ping
通讯作者: Ni, LY, Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol China, Donghu Expt Stn Lake Ecosyst, Wuhan 430072, Peoples R China ; Nily@ihb.ac.cn, caote@ihb.ac.cn
关键词: NH4+ ; Microcystins ; Hypoxia ; Antioxidant activity ; C-N balance ; Aquatic macrophytes
刊名: CHEMOSPHERE
发表日期: 2011
卷: 82, 期:3, 页:329-339
收录类别: SCI
部门归属: [Zhang, Meng; Xu, Jun; Liu, Yaqin; Ni, Leyi; Cao, Te; Xie, Ping] Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol China, Donghu Expt Stn Lake Ecosyst, Wuhan 430072, Peoples R China; [Zhang, Meng] Jiangxi Acad Environm Sci, Nanchang, Peoples R China; [Wang, Zhengqi] Amer Hach Co, Shanghai Representat Off, Shanghai, Peoples R China
资助者: National Natural Science Foundation of China [30800146]; National Basic Research Project of China [2008CB418000]
摘要: The heavy bloom of cyanobacteria is a disastrous consequence of freshwater eutrophication, and the bloom is highly toxic due to its secondary metabolites called microcystins (MCs). The release of organic substances from dense blooms causes an increase in NH4+ and decrease in oxygen in lake water. In the present study, the dynamics of physio-biochemical responses of five aquatic macrophytes to MCs and NH4+ stresses in Meiliang Bay were evaluated. The bay is one of the most seriously eutrophized areas dominated by the toxic cyanobacteria of Lake Taihu, China. The results demonstrate that aquatic macrophytes in Meiliang Bay are subjected to successive external stresses. From January to May, they are subjected to high NH4+ stress (>0.56 mg L-1), whereas from June to September or during dense blooms, the macrophytes experience both MC proliferation and moderate NW, toxicity (>0.3 mg L-1). In August, high NH4+ stress occurs along with hypoxia stress, whereas from September to December, the macrophytes experience moderate NH4+ stress, causing a serious imbalance in C-N metabolism and oxidative stress. Between the two aquatic plant life forms, floating-leaved plants are more resistant to the stresses of eutrophication than are submersed plants. Elevated MCs in the water column can aggravate oxidative stress and suppress the soluble protein contents of aquatic plants. High NH4+ in the water causes severe C and N imbalance in submersed macrophytes because of considerable carbon consumption for free amino acid synthesis. The superoxide dismutase activities of submersed macrophytes are suppressed by low light penetrating the eutrophic water, which might impair the antioxidative function of the plants. The findings of this study provide mainly field evidence that reveals the physical, chemical, and biological stresses on aquatic plants in bloom-prevailed eutrophic lakes. (C) 2010 Elsevier Ltd. All rights reserved.
语种: 英语
WOS记录号: WOS:000286493800005
ISSN号: 0045-6535
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/15466
Appears in Collections:淡水生态学研究中心_期刊论文

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Zhang, Meng; Wang, Zhengqi; Xu, Jun; Liu, Yaqin; Ni, Leyi; Cao, Te; Xie, Ping.Ammonium, microcystins, and hypoxia of blooms in eutrophic water cause oxidative stress and C-N imbalance in submersed and floating-leaved aquatic plants in Lake Taihu, China,CHEMOSPHERE,2011,82(3):329-339
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