RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2011, Vol. 20 >> Issue (12): 1481-.

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EFFECTS OF EXPERIMENTAL SEDIMENT SUSPENSION ON THE NUTRIENTS RELEASE AND GROWTH OF ALGAL BLOOM

WANG Xiaodong1,2,QIN Boqiang1,LIU Lizhen1,ZHAO Linlin2,
DING Yanqing1,ZHU Guangwei1,GAO Guang1,LIU Xingguo2   

  1. (1.State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China;2.Fishery Machinery and Instrument Research Institute,Chinese Academy of Fisheries Sciences,Shanghai 200092,China;3.College of Hydrology and Water Resources,Hohai University,Nanjing 210098,China
  • Online:2011-12-20

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Abstract:

An indoor experiment was conducted to study the effect of sediment suspension on the release of nitrogen (N),phosphorus (P) and proliferation of cyanobacteria bloom,in which the sediment and overlying water were all from Lake Taihu.The disturbance intensity was expressed as suspended substance (SS).The concentrations of N,P and chlorophylla (Chla) were measured during the process of disturbance and the following 48 hours after the disturbance stopped,and the sampling interval was 6 hours.The results showed that the disturbance improved the total nitrogen,total phosphorus and soluble reactive phosphorus significantly,however,there was no significant increase of dissolved inorganic nitrogen (NO-3N,NO-2N and NH+4N),neither did the Chla.Nitrogen limitation may be the reason of no increase of the algal bloom.It showed that sediment suspension promoted the release of N and P,but those nutrients not necessarily improved the cyanobacteria bloom.Further study on the effects of nutrients released from sediment to cyanobacteria bloom is necessary.

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