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引用本文:范成新,张路,秦伯强,胡维平,高光,王建军.太湖沉积物-水界面生源要素迁移机制及定量化——1.铵态氮释放速率的空间差异及源-汇通量.湖泊科学,2004,16(1):11-21. DOI:10.18307/2004.0102
FAN Chengxin,ZHANG Lu,QIN Boqiang,HU Weiping,GAO Guang,WANG Jianjun.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. J. Lake Sci.2004,16(1):11-21. DOI:10.18307/2004.0102
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太湖沉积物-水界面生源要素迁移机制及定量化——1.铵态氮释放速率的空间差异及源-汇通量
范成新1, 张路1,2, 秦伯强1, 胡维平1, 高光1,2, 王建军1,2
1.中国科学院南京地理与湖泊研宄所, 南京 210008;2.中国科学院研宄生院, 北京 100039
摘要:
采集柱状芯样,室内静态模拟不同温度下太湖沉积物铵态氮释放.结果表明,经面积加权,5℃、15℃和25℃下氮的交换速率分别为-16.0±17.6mg/(m2·d)、12.6±6.9mg/(m2·d)和34.1±20.8mg/(m2·d),不同湖区其释放速率差异极大.受外源污染影响较大的水域,氮释放量随温度的升高而增加;受死亡残体沉降和分解影响明显的草藻型湖区,氮的年释放通量较大.全太湖沉积物-水界面NH4+-N的年净通量为9960.3±4960.0t,其中成汇的通量值约为-911±637.9t/a,大部分泥区在一年中至少经过了一次的源-汇转换过程.
关键词:  沉积物-水界面    释放  通量  源-汇转换  太湖
DOI:10.18307/2004.0102
分类号:
基金项目: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.
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 Chengxin1, ZHANG Lu1,2, QIN Boqiang1, HU Weiping1, GAO Guang1,2, WANG Jianjun1,2
1.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P.R.China;2.Graduate School of Chinese Academy of Sciences, Beiing 100039, P.R.China
Abstract:
The ammonium release of core samplers in Lake Taihu were simulated at different temperatures.The results showed that the area-weighed nitrogen exchange rates in the conditions of 5g,15g, and25gare-16.0±17.6mg/(m2·d),12.6±6.9mg/(m2·d),and34.1±20.8mg/(m2·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 between the ammonium exchange amount and temperature.In the areas where there are more algal gathering 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, onthewholelake, wasestimatedtobeabout9960.3±4960.0t/a, ofwhichthesinking flux was about-911±637.9t/a.There appeared source-sink transition at least once in most of the sediment areas.
Key words:  Sediment-water interface  nitrogen  release  flux  source-sink transition  Lake Taihu
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