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Effects of Environmental Factors on NH+4 Release in Sediment from Chaohu Lake

LIU Jing-jing et al(Guilin Research Institute of Geology for Mineral Resources,Guilin,Guangxi 541004)  
[Objective] The aim of the research was to reveal the influence mechanism of sediment-water exchange of nutrients in Chaohu Lake.[Method] The effects of environmental factors(overlying water,temperature,pH and dissolved oxygen concentration) on NH+4 release in sediment from Chaohu Lake were studied under controlled laboratory conditions.[Results] With the rising of temperature and the decrease of NH+4 concentration in overlying water,NH+4 released from sediment increased significantly.pH had a great effect on NH+4 release with a complicated mechanism.The largest release amount of NH+4 under anaerobic condition was about 6 times as much as that under aerobic condition.[Conclusion] This research would provide theoretical support for environmental management of Chaohu Lake in the project of leading water from the Yangtze River to Chaohu Lake.
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