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Volume 20 Issue 1

Jan.  2003

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Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2003 >  20(1): 119-127

An Investigation on the Relationship Between Emission/Uptake of Greenhouse Gases and Environmental Factors in Semiarid Grassland

  • 1.

    State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Institute of Botany, Chinese Academy of Sciences, Beijing 100093,State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029


doi: 10.1007/BF03342056

  • Measurements of greenhouse gases CO2, CH4, and N2O were made by static chamber-gas chromato-graph in Inner Mongolia. Results indicate that with growing seasons, the daily variation patterns ofemission/uptake of greenhouse gases differ greatly in the prairie ecosystem. The peak of seasonal emis-sion/uptake of three greenhouse gases occurs at the melting period in spring when soil moisture is highand rainfall is rich. The daily emissions of CO2 from steppe vegetation in growing seasons are low duringthe daytime and high at night. Higher temperatures are advantageous to emission of CO2, as abovegroundbiomass determines the amount of CO2 photosynthetic uptake. The key factors that influence the dailyvariation patterns of CH4 uptake and N2O emission in semiarid grassland are soil moisture and the oxygensupplying condition, while the changes in daily temperature mainly affect the range of daily variations.The seasonal changes of N2O emission are positively related to seasonal change in soil moisture. Freegrazing reduces the daily mean deviation of exchange rates of CO2, N2O, and CH4, but it decreases theamount of annual emission/uptake of N2O and CH4 yet it increases the annual emission of CO2.
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    • Manuscript History

    Manuscript received: 10 January 2003
    Manuscript revised: 10 January 2003
    通讯作者: 陈斌, bchen63@163.com
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      沈阳化工大学材料科学与工程学院 沈阳 110142

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    An Investigation on the Relationship Between Emission/Uptake of Greenhouse Gases and Environmental Factors in Semiarid Grassland

    • 1. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Institute of Botany, Chinese Academy of Sciences, Beijing 100093,State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029
    • Manuscript received: 2003-01-10
    • Manuscript revised: 2003-01-10

    Abstract: Measurements of greenhouse gases CO2, CH4, and N2O were made by static chamber-gas chromato-graph in Inner Mongolia. Results indicate that with growing seasons, the daily variation patterns ofemission/uptake of greenhouse gases differ greatly in the prairie ecosystem. The peak of seasonal emis-sion/uptake of three greenhouse gases occurs at the melting period in spring when soil moisture is highand rainfall is rich. The daily emissions of CO2 from steppe vegetation in growing seasons are low duringthe daytime and high at night. Higher temperatures are advantageous to emission of CO2, as abovegroundbiomass determines the amount of CO2 photosynthetic uptake. The key factors that influence the dailyvariation patterns of CH4 uptake and N2O emission in semiarid grassland are soil moisture and the oxygensupplying condition, while the changes in daily temperature mainly affect the range of daily variations.The seasonal changes of N2O emission are positively related to seasonal change in soil moisture. Freegrazing reduces the daily mean deviation of exchange rates of CO2, N2O, and CH4, but it decreases theamount of annual emission/uptake of N2O and CH4 yet it increases the annual emission of CO2.

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