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《Journal of Lake Science》 2004-01
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Migration Mechanism of Biogenic Elements and Their Quantification on the Sediment-water Interface of Lake Taihu:Ⅰ.Spatial Variation of the Ammonium Release Rates and Its Source and Sink Fluxes

FAN Chengxin 1 ,ZHANG Lu 1,2 ,QIN Boqiang 1 ,HU Weiping 1 ,GAO Guang 1 &WANG Jianjun 1,2 (1:Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing210008,P.R.China;2:Graduate School of Chinese Academy of Sciences,Beiing100039,P.R.China)  
The ammonium release of core samplers in Lake Taihu were simulated at different tempera-tures.The results showed that the area-weighed nitrogen exchange rates in the conditions of5℃,15℃,and25℃are-16.0±17.6mg/(m 2 · d),12.6±6.9mg/(m 2 · d),and34.1±20.8mg/(m 2 · d),respectively.But the ammonium fluxes were quite different among the sediments from different lake aveas.In respect of the waters that were greatly influenced by external pollution source,there was a positive correlation be-tween the ammoniumexchange amount and temperature.In the areas where there are more algal gather-ing and macrophyte growth,the annual release fluxes of nitrogen were usually greater because of being impacted with deposition of biological detritus on the surficial sediment.The ammonium exchange amount,on the whole lake,was estimated to be about9960.3±4960.0t/a,of which the sinking flux was about-911±637.9t/a.There appeared source-sink transition at least once in most of the sediment ar-eas.
【Fund】: 中国科学院知识创新重大项目(KZCX1-SW-12);; 国家自然科学基金(40171083);; 中国科学院知识创新领域前沿项目(CXNIGLAS-A02-02)联合资助.
【CateGory Index】: X524
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