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《Journal of Hydroecology》 2011-05
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Relationships between Chlorophyll-a Content and TN,TP Concentrations in Coastal Waters of South Taihu Lake

ZHAO Han-qu,WEI Xiao-hang,YAO Wei-zhong,ZHANG Min,WANG Jun(Zhejiang Institute of Freshwater Fisheries,Huzhou 313001,China)  
During four cruises conducted from June,2007 to April,2008,the relationships between the chlorophyll-a(Chl.a) content and concentrations of total nitrogen(TN),total phosphorus(TP) and the ratio of TN vs TP(N/P) were investigated.The results showed that both Chl.a content and TN concentration varied significantly in seasons.The Chl.a content had significant relations with the TN concentration during the cyaobacterial boom in June,2007 and April,2008,while had no significant relations in October,2007 and January,2008.In addition,the Chl.a had no significant relations with the concentrations of TP among the four seasonal cruise investigations,respectively.Using ridge regression analysis method,we found that the optimal ratio of N/P for the growth of cyaobacterial alge ranged from 10 to 25,of which the Chl.a related with TN,TP and N/P significantly,and the multiple regression equation was Chl.a=-0.0012+0.0064 TN +0.0215 TP +0.0005N/P(R=0.543,P0.023).In all,the current concentrations of N and P have positive effect on the algal growth,and neither of them has the potential of being the limited factor for algae bloom.The algae bloom in the south of Taihu Lake may be regulated and controlled by other environmental factors such as water temperature,sun light,hydrological and monsoon.And the seasonal variations of algae bloom could be affected conjunctly by these factors above.
【Fund】: 湖州市重大科技专项(2007ZDN01)
【CateGory Index】: X524
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