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Dredging effects on P status and phytoplankton density and composition during winter and spring in Lake Taihu, China
Cao, Xiuyun; Song, Chunlei; Li, Qingman; Zhou, Yiyong; Zhou, YY, Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
2007
Conference NameInternational Symposium on the Eutrophication Process and Control in Large Shallow Lakes
Source PublicationHYDROBIOLOGIA
Pages287-295
Conference DateAPR 22-26, 2005
Conference PlaceNanjing, PEOPLES R CHINA
DepartmentChinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
AbstractPhytoplankton 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.
KeywordPhytoplankton Phosphorus Alkaline Phosphatase Elf Sediment Dredging Shallow Lakes Eutrophication
Indexed BySCI
Language英语
WOS IDWOS:000244992800029
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Document Type会议论文
Identifierhttp://ir.ihb.ac.cn/handle/342005/11777
Collection会议论文
Corresponding AuthorZhou, YY, Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
Recommended Citation
GB/T 7714
Cao, Xiuyun,Song, Chunlei,Li, Qingman,et al. Dredging effects on P status and phytoplankton density and composition during winter and spring in Lake Taihu, China[C],2007:287-295.
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