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题名: Dredging effects on P status and phytoplankton density and composition during winter and spring in Lake Taihu, China
作者: Cao, Xiuyun ; Song, Chunlei ; Li, Qingman ; Zhou, Yiyong
会议文集: HYDROBIOLOGIA
会议名称: International Symposium on the Eutrophication Process and Control in Large Shallow Lakes
会议日期: APR 22-26, 2005
出版日期: 2007
会议地点: Nanjing, PEOPLES R CHINA
关键词: phytoplankton ; phosphorus ; alkaline phosphatase ; ELF ; sediment dredging ; shallow lakes ; eutrophication
通讯作者: Zhou, YY, Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
收录类别: SCI
部门归属: Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
摘要: Phytoplankton density and composition, together with phosphorus (P) concentrations and size-fractionated alkaline phosphatase activity (APA), were investigated in dredged and undredged zones in Lake Taihu from January to April 2004. P concentrations were also determined in the corresponding interstitial water. Enzyme Labeled Fluorescence (ELF) was used for localizing extracellular phosphatase on phytoplankton cell membranes in April. The increase in phytoplankton density was paralleled by a significant increase in soluble reactive P (SRP) concentrations in the water column and interstitial water at all sites from January to April, with chlorophyte gradually becoming dominant. In February, at the undredged site, more algae dominated by chlorophyte occurred in overlying water, rather than in the surface, coinciding with higher SRP concentrations in overlying and interstitial water. Therefore, P status in the bottom is important to phytoplankton development in terms of density and composition. Undredged sites had higher SRP concentrations in interstitial water than dredged sites. Furthermore, Higher APA was observed, accompanied by higher dissolved organic P (DOP) and lower total P at the undredged site in February. Enzymatic hydrolysis of DOP may have been an additional source of P for phytoplankton. In April, Schroederia sp. was ELF labeled in surface water at the dredged site, which showed markedly lower SRP concentration, but not at the undredged site with higher SRP concentration. Thus, the dredging might regulate algal density and composition in water column by reducing P bioavailability.
语种: 英语
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内容类型: 会议论文
URI标识: http://ir.ihb.ac.cn/handle/342005/11777
Appears in Collections:中科院水生所知识产出(2009年前)_会议论文

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Cao, Xiuyun; Song, Chunlei; Li, Qingman; Zhou, Yiyong.Dredging effects on P status and phytoplankton density and composition during winter and spring in Lake Taihu, China.见:.HYDROBIOLOGIA,,2007,287-295
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