知识与财富的链接
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/穴m2·d雪、12.6±6.9mg/穴m2·d雪和34.1±20.8mg/穴m2·d雪,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.
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.
