内蒙古草原N_2O和CH_4排放通量及其季节变化特征研究

Characteristics of N_2O and CH_4 Fluxes and Their Seasonal Variations From Inner Mongolia Grassland

1998年5～12月，作者在内蒙古半干旱草原用静态箱法进行原位N2O和CH4排放通量观测，分析N2O、CH4排放量及其季节变化和相关过程，定量估计草原N2O和CH4收支在人类活动下的变化。重点讨论了内蒙古草原典型群落羊草、大外茅和退化草原N2O和CH4的排放通量及其季节变化特征。

In situ measurements of N2O and CH4 fluxes by using the closed box method were made inInner Mongolia grassland during the period of May～December, 1998. Based on obtained results,N2O andCH4 fluxes from semi-arid grassland and relevant processes are analyzed,quantitative estimate of grazingimpact on N2O and CH4 nuxes are in discussed. Selection of measurement sites,experimental methods aredescribed briefly and N2O,CH4 fluxes from Leymus chinensis and StiPa grandis grasslands,and their sea-sonal variation characteristics are descried and discussed in this paper.