1998年6月1日、7月2日、8月3日和9月1日用静态箱-气相色谱法对内蒙古锡林河流域草甸草原CH4和N2O排放通量的昼夜观测表明,天然草原是N2O的源、CH4的汇,其排放和吸收具有明显的昼夜变化规律。4次昼夜观测的结果还表明,草甸草原排放N2O和吸收CH4的能力具有强烈的季节变化规律
Temperate and tropical oxic soils usually exhibit low levels of atmospheric CH4 oxidation, which are estimated to consume about 10% of the atmospheric CH4. It has been reported that the semi-arid grasslands represent a significant global sink for CH4 and