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学科主题: Fisheries; Limnology; Marine & Freshwater Biology; Oceanography
题名: The role of NH4+ toxicity in the decline of the submersed macrophyte Vallisneria natans in lakes of the Yangtze River basin, China
作者: Cao, Te; Xie, Ping; Ni, Leyi; Wu, Aiping; Zhang, Min; Wu, Shikai; Smolders, A. J. P.
通讯作者: Ni, LY, Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Donghu Expt Stn Lake Ecosyst, Wuhan 430072, Peoples R China
关键词: ammonium toxicity ; FAA/SC ratio ; propagation
刊名: MARINE AND FRESHWATER RESEARCH
发表日期: 2007
DOI: 10.1071/MF06090
卷: 58, 期:6, 页:581-587
收录类别: SCI
文章类型: Article
部门归属: Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Donghu Expt Stn Lake Ecosyst, Wuhan 430072, Peoples R China; Huazhong Agr Univ, Coll Fisheries, Wuhan 430070, Peoples R China; Radboud Univ Nijmegen, Inst Water & Wetland Res, Dept Environm Biol, NL-6525 ED Nijmegen, Netherlands
WOS标题词: Science & Technology ; Life Sciences & Biomedicine ; Physical Sciences
类目[WOS]: Fisheries ; Limnology ; Marine & Freshwater Biology ; Oceanography
研究领域[WOS]: Fisheries ; Marine & Freshwater Biology ; Oceanography
摘要: Experimental and field studies were conducted to evaluate the effects of NH4+ enrichment on growth and distribution of the submersed macrophyte, Vallisneria natans L, in lakes of the Yangtze River in China, based on the balance between free amino acids (FAA) and soluble carbohydrates (SC) in the plant tissue. Increase of NH4+ rather than NO3- concentrations in the water column caused FAA accumulation and SC depletion of the plant. The plant showed a unimodal pattern of biomass distribution along both FAA/SC ratios and external NH4+ concentrations, indicating that a moderate NH4-N concentration (< 0.3 mg L-1) benefited the plant, whereas the high NH4-N concentration (> 0.56 mg L-1) eliminated the plant completely. Therefore, 0.56 mg NH4-N mg L-1 in the water column was taken as the upper limit for V. natans in lakes of the Yangtze River basin. The mesocosm experiment showed that at a high external NH4-N (0.81 mg L-1), V. natans failed to propagate with a loss of half SC content (5 mg g(-1) DW) in the rhizomes, indicating that the consumption of carbohydrates for detoxification of excess NH4+ into non-toxic FAA significantly diminished carbohydrate supply to the rhizomes. This might consequently inhibit the vegetative reproduction of the plant, and also might be an important cause for the decline and disappearance of the plant with eutrophication. The present study for the first time reports substantial ecophysiological evidences for NH4+ stress to submersed macrophytes, and indicates that NH4+ toxicity arising from eutrophication probably plays a key role in the deterioration of submersed macrophytes like V. natans.
英文摘要: Experimental and field studies were conducted to evaluate the effects of NH4+ enrichment on growth and distribution of the submersed macrophyte, Vallisneria natans L, in lakes of the Yangtze River in China, based on the balance between free amino acids (FAA) and soluble carbohydrates (SC) in the plant tissue. Increase of NH4+ rather than NO3- concentrations in the water column caused FAA accumulation and SC depletion of the plant. The plant showed a unimodal pattern of biomass distribution along both FAA/SC ratios and external NH4+ concentrations, indicating that a moderate NH4-N concentration (< 0.3 mg L-1) benefited the plant, whereas the high NH4-N concentration (> 0.56 mg L-1) eliminated the plant completely. Therefore, 0.56 mg NH4-N mg L-1 in the water column was taken as the upper limit for V. natans in lakes of the Yangtze River basin. The mesocosm experiment showed that at a high external NH4-N (0.81 mg L-1), V. natans failed to propagate with a loss of half SC content (5 mg g(-1) DW) in the rhizomes, indicating that the consumption of carbohydrates for detoxification of excess NH4+ into non-toxic FAA significantly diminished carbohydrate supply to the rhizomes. This might consequently inhibit the vegetative reproduction of the plant, and also might be an important cause for the decline and disappearance of the plant with eutrophication. The present study for the first time reports substantial ecophysiological evidences for NH4+ stress to submersed macrophytes, and indicates that NH4+ toxicity arising from eutrophication probably plays a key role in the deterioration of submersed macrophytes like V. natans.
关键词[WOS]: PLANT COMMUNITY STRUCTURE ; FREE AMINO-ACIDS ; AMMONIUM TOXICITY ; SOFT WATERS ; NITROGEN ; GROWTH ; ACIDIFICATION ; ACCUMULATION ; PHOSPHORUS ; METABOLISM
语种: 英语
WOS记录号: WOS:000247612900008
ISSN号: 1323-1650
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/152342/8528
Appears in Collections:中科院水生所知识产出(2009年前)_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Donghu Expt Stn Lake Ecosyst, Wuhan 430072, Peoples R China
2.Huazhong Agr Univ, Coll Fisheries, Wuhan 430070, Peoples R China
3.Radboud Univ Nijmegen, Inst Water & Wetland Res, Dept Environm Biol, NL-6525 ED Nijmegen, Netherlands

Recommended Citation:
Cao, Te; Xie, Ping; Ni, Leyi; Wu, Aiping; Zhang, Min; Wu, Shikai; Smolders, A. J. P..The role of NH4+ toxicity in the decline of the submersed macrophyte Vallisneria natans in lakes of the Yangtze River basin, China,MARINE AND FRESHWATER RESEARCH,2007,58(6):581-587
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