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内蒙古大针茅草原的N2O和CH4通量变化特征
The variation characters of N2O and CH4 fluxes in Stipa grandis grassland in Inner Mongolia
【摘要】 利用透光密闭箱对内蒙古半干旱典型草原大针茅草原土壤-植被系统温室气体N2O和CH4通量在不同年份进行了较长期的原位观测研究.结果表明,大针茅草地作为大气N2O的源和CH4的汇而起作用,N2O与CH4的排放强度分别为(1.37~16.33μg/(m2·h)和-227~-1μg/(m2·h), N2O和CH4的通量具有明显的日变化和季节变化特征,并且主要的环境因子(温度、水分)对其有重要影响.N2O通量的季节变化特征表现为:夏>秋>春>冬;CH4通量的季节变化特征表现为:春>夏>秋>冬.
【Abstract】 Using transparent closed chamber technique, the in situ measurements of N2O and CH4 fluxes in temperate typical semi-arid grasslands-Stipa grandis soil-vegetation ecosystem were conducted in different years in Inner Mongolia. The results showed that this kind of temperate typical semi-arid grasslands was the source of N2O and the sink of CH4. The emission flux ranges of N2O and CH4 were:-1.37~16.33μg/(m2(h) and -227~-1 μg/(m2(h) respectively. The diurnal and seasonal variation characters of N2O and CH4 flux were prominent; and there were great effects of main environmental factors (temperature and soil moisture) on N2O and CH4 fluxes. The characters of seasonal variation of N2O flux were summer > autumn > spring > winter and those of CH4 were spring > summer > autumn > winter.
【Key words】 Stipa grandis grasslands; greenhouse gas; flux; diurnal variation; seasonal variation;
- 【文献出处】 中国环境科学 ,China Environmental Science , 编辑部邮箱 ,2001年04期
- 【分类号】X16
- 【被引频次】35
- 【下载频次】187