Advances in Atmospheric Sciences

, Volume 20, Issue 1, pp 119–127 | Cite as

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

  • Yuesi Wang
  • Yuqiong Hu
  • Baoming Ji
  • Guangren Liu
  • Min Xue
Article
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Abstract

Measurements of greenhouse gases CO2, CH4, and N2O were made by static chamber-gas Chromatograph in Inner Mongolia. Results indicate that with growing seasons, the daily variation patterns of emission/uptake of greenhouse gases differ greatly in the prairie ecosystem. The peak of seasonal emission/uptake of three greenhouse gases occurs at the molting period in spring when soil moisture is high and rainfall is rich. The daily emissions of CO2 from steppe vegetation in growing seasons are low during the daytime and high at night. Higher temperatures are advantageous to emission of CO2, as aboveground biomass determines the amount of CO2 photosynthetic uptake. The key factors that influence the daily variation patterns of CH4 uptake and N2O emission in serniarid grassland are soil moisture and the oxygen supplying 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. Free grazing reduces the daily mean deviation of exchange rates of CO2, N2O, and CH4, but it decreases the amount of annual emission/uptake of N2O and CH4 yet it increases the annual emission of CO2.

Key words

variation temperature moisture emission/uptake CO2 CH4 N2O 
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Copyright information

© the editorial office of Advancees in Atmospheric Sciences (China) 2003

Authors and Affiliations

  • Yuesi Wang
    • 1
  • Yuqiong Hu
    • 1
  • Baoming Ji
    • 2
  • Guangren Liu
    • 1
  • Min Xue
    • 1
  1. 1.Slate Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric ChemistryInstitute of Atmospheric Physics, Chinese Academy of SciencesBeijing
  2. 2.Institute of BotanyChinese Academy of SciencesBeijing

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