Effects Of Water Table Level And Soil Temperature On CH₄ Emissions In Zoig（?）

Wetland ecosystem is the biggest source of CH₄ emission,In order to study the impact of environment factors on wetland methane CH₄ emissions, we monitored water table level and soil temperature in Zoige Peatlands and compared monthly change of methane emission during 6 months of plant growth period at mesocosm scale, from May to October, 2015. Three water level scenarios were considered: 0 cm depth, 10 cm depth and 20 cm depth（presented below as W0, W10 and W20, respectively）. Results show:CH₄ emission increased when water table depths increased from W20 to W10 and W10 to W0 cm during May to September. There were no significant difference in October. The overall change of CH₄ emission from May to October was a single-peak curve and maximum flux of CH₄ emission was observed in July. The mean CH₄ emission fluxes were 6.2633, 4.7544 and 3.9498 mg/（m2·h） at the water table depths of 0, 10 and 20 cm, The methane flux from Zoige Peatland is at the same quantity level as other types of wetland.Respectively, In a limited temperature range, CH₄ emission fluxes increased exponentially with the increase of soil temperature at various water table depths. The CH₄ emission fluxes were most sensitive to soil temperature changes at the water table depths of W0 cm, followed by W10, while CH₄ emission fluxes were of the least significance at the water table depths of W20 cm. Climate warming will lead to the release of more CH₄ into the atmosphere in Zoig（?）.In the two important of hydrology and climate factors,The temperature has shown no significant decisive role on the emission of methane,And the water level is the main effect,The effect of temperature on methane emission is nested in the level to the methane emission. The influence of temperature nested in the water table level influence on methane emissions. The interaction of temperature and water level on methane producing and flux and transporting is too complex to irregular, or there is a greater uncertainty, it is no longer the main effect of methane emissions.The results suggest that CH₄ emission flux varies with seasons in Zoige Peatlands and that, in general, high water table depth and temperature enhance CH₄ emission fluxes. Zoig（?） wetland is a powerful source of atmospheric methane emission during the growing season,which is strongly related to the water level and the temperature of surface soil,in general, high water table depth and temperature enhance CH₄ emission fluxes.