采用静态箱-便携式红外色谱法对青藏高原风火山地区沼泽草甸和高寒草甸两类生态系统CO2排放通量进行了研究.结果表明:生长期内两类生态系统之间及同一生态系统内部不同的退化程度之间CO2排放通量均存在较大差异.其中:未退化沼泽草甸较高寒草甸CO2的排放通量同比高出65.1%～80.3%;中度退化沼泽草甸较高寒草甸CO2的排放通量同比高出22.1%～67.5%;然而,严重退化的高寒草甸比沼泽草甸CO2的排放通量反而高出14.3%～29.5%.对于同类型高寒草地,未退化沼泽草甸CO2的排放通量分别是中度退化和严重退化的1.12～1.69倍和1.41～3.86倍;严重退化高寒草甸CO2的排放通量分别是未退化和中度退化的1.11～1.78倍和1.04～1.79倍.

As two very important ecosystems on the Plateau, swamp and alpine meadows have been playing an important role in carbon balance. Studies were carried on CO_2 fluxes from the two ecosystems with a close chamber-infrared spectrum technique in the Fenghuoshan area on the Tibetan Plateau., The results showed that the CO_2 fluxes were significantly different between the swamp meadow and alpine meadow ecosystems and between the different degenerate meadows, correspondingly. The CO_2 fluxes from the non-degradation swamp meadow were higher than those from the non-degradation alpine meadow by 65.1 to 80.3 percent; the CO_2 fluxes from the moderate degradation swamp meadow were higher than those from the corresponding degradation alpine meadow by 22.1 to 67.5 percent. In contrast, the CO_2 fluxes from the severe degradation alpine meadow were higher than those from the corresponding degradation swamp meadow by 14.3 to 29.5 percent. In the same high-cold ecosystem, the CO_2 fluxes from non-degradation swamp meadow were 1.12~1.69 times and 1.41~3.86 times higher than those from the moderate and severe degradation swamp meadows, respectively; the CO_2 fluxes from the severe degradation alpine meadow were 1.11~1.78 times and 1.04~1.79 times higher than those from the non-degradation and moderate degradation alpine meadows, respectively.