沼泽湿地生态系统CO_2、CH_4和N_2O排放通量的相互关系研究

Research on Relationship Among CO_2,CH_4 and N_2O Emission Fluxes in Freshwater Marsh Ecosystem

利用静态暗箱/气相色谱法连续两个生长季(2003-2004年)对三江平原小叶章草甸和毛果苔草沼泽CO2、CH4和N2O的排放通量进行野外原位观测。结果表明:两种类型湿地的生长季均为温室气体的排放源,三种温室气体排放通量之间的关系是,CO2和CH4、CO2和N2O、CH4和N2O排放通量之间均为正相关,但显著性水平视不同湿地类型以及不同年份而异。表明它们之间的相互关系受湿地类型以及环境因素的影响,本研究结果进一步证明了植物在沼泽湿地温室气体排放中的关键性作用。

CO2,CH4 and N2O fluxes were measured using the technique of closed opaque chamber and gas chromatography system.The experiment was carried out during 2003-2004 growing seasons in field of Calamagrostis angustifoli meadow and Carex lasiocarpa marsh in the Sanjiang Plain.The results showed that the two wetlands both were emission sources of greenhouse gases during growing seasons.There was a positively significant correlation between CO2 and CH4 emission fluxes,CO2 and N2O emission fluxes,and CH4 and N2O emission fluxes.But the level was different in various wetlands or years.It indicated that the relationship was influenced by wetland types and environmental factors.It was proved further that plants played a key role in greenhouse gases emission in freshwater marsh ecosystem.