太湖梅梁湾沉积物-水界面氮迁移特征初步研究

Characteristics of Nitrogen Removing Between Sediment-Water Interface in Meiliang Bay, Taihu Lake

用乙炔为抑制剂，气相色谱法测定了1997年夏季太湖梅梁湾口沉积物－水界面的反硝化率和N2O的自然排放率，太湖梅梁湾沉积物的反硝化率为1．4－5．6μmolN2／（m2·h），N2O的自排放率为0．08－0．66μmolN2／（m2·h）．探讨了沉积物－水界面NO3-交换动态．指出沉积物内硝化－反硝化作用是太湖湖泊生态系统氮循环过程中一个重要的环节．在湖泊水土界面氮交换中，沉积物具有吸收水体中NO3-的性能．

It has been measured that the sediment denitrification rate and the N2O natural emission rate at the mouth of Meiliang Bay, Taihu Lake, in the summer of 1997. The measure was performed by Acetylene inhibition technique. The sediment denitrification rate is 1.4-5. 6μmol/ (m2·h) at the sediment-water interface of Meiliang Bay, Taihu Lakc, and the N2O natural emission rate is 0.08-0.66μmol/ (m2·h). The exchange trend of NO3 between sediment-water interface was discussed as well. It has been pointed out that the sediment denitrification is an important sink in the nitrogen cycling of the Taihu Lake ecosystem. The sediments have a function that absorbs NO3 ions from the water column into sediment in the nitrogen exchange process between the sediment-water interface.