沼泽与高寒草甸退化对CH4和CO2通量的影响

在青藏高原风火山地区,对不同退化程度沼泽和高寒草甸CH4和CO2通量以及相应的环境因子进行了为期1年的观测.结果表明,不同退化程度沼泽草甸CH4和CO2通量均表现出排放特征,排放强度随退化程度的增加而降低;不同退化程度高寒草甸对CO2表现为排放特征,而对CH4却表现为吸收特征,且均随着退化程度的加剧而增强.未来气候模式下,沼泽与高寒草甸退化将对区域气温升高起到一定的促进作用.气温、5cm土壤温度和土壤水分含量以及生物量是影响CH4和CO2的通量的主要环境因子.

Influence of degradation of the swamp and alpine meadows on CH4 and CO2 fluxes on the Qinghai-Tibetan Plateau

In the Fenghuoshan region on the Qinghai-Tibetan Plateau, the CH4 and CO2 fluxes and the corresponding environmental factors of the swamp and alpine meadows with different degradation degrees were determined for one year. The swamp meadows with different degradation degrees all showed the characteristics of CH4 and CO2 emitting and the emission intensities reduced with the degradation degrees increased; the different degraded alpine meadows showed the characteristics of CO2 emitting but CH4 being absorbed and all the fluxes increased with the degradation degrees pricked up. In the future climate conditions, degradations of the swamp and alpine meadows on the Qinghai-Tibetan Plateau would play a promotion role during the regional warming. Air temperature, soil temperature and moisture at the 5cm depth and biomass were the major environmental factors influencing the CH4 and CO2 fluxes.