Plant and Soil

, Volume 308, Issue 1–2, pp 105–117 | Cite as

Fluxes of nitrous oxide, methane and carbon dioxide during freezing–thawing cycles in an Inner Mongolian steppe

  • J. Holst
  • C. Liu
  • Z. Yao
  • N. Brüggemann
  • X. Zheng
  • M. Giese
  • K. Butterbach-Bahl
Regular Article


Fluxes of nitrous oxide (N2O), methane (CH4) and carbon dioxide (CO2) were followed at winter-grazed (WG) and ungrazed steppe (UG99) in Inner Mongolia during the winter–spring transition of 2006. Mean fluxes during the period March 12–May 11 were 8.2 ± 0.5 (UG99) and 1.5 ± 0.2 μg N2O–N m−2 h−1 (WG) for N2O, 7.2 ± 0.2 (UG99) and 3.0 ± 0.1 mg CO2–C m−2 h−1 (WG) for CO2 and −42.5 ± 0.9 (UG99) and −14.1 ± 0.3 μg CH4–C m−2 h−1 (WG) for CH4. Our data show that N2O emissions from semi-arid steppe are strongly affected by freeze–thawing. N2O emissions reached values of up to 75 μg N2O–N m−2 h−1 at the UG99 site, but were considerably lower at the WG site. The observed differences in N2O, CH4 and CO2 fluxes between the ungrazed and grazed sites were ascribed to the reduced plant biomass at the grazed site, and—most important—to a reduction in soil moisture, due to reduced snow capturing during winter. Thus, winter-grazing significantly reduced N2O emission but on the other hand also reduced the uptake of atmospheric CH4. To finally evaluate which of the both effects is most important for the non-CO2 greenhouse gas balance measurements covering an entire year are needed.


Nitrous oxide Methane Carbon dioxide Freeze–thaw events Semi-arid grassland Grazing Inner Mongolia MAGIM 


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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • J. Holst
    • 1
    • 5
  • C. Liu
    • 2
  • Z. Yao
    • 2
  • N. Brüggemann
    • 1
  • X. Zheng
    • 2
  • M. Giese
    • 3
  • K. Butterbach-Bahl
    • 1
    • 4
  1. 1.Institute for Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Karlsruhe Research Center (FZK)Garmisch-PartenkirchenGermany
  2. 2.Institute for Atmospheric Physics, Chinese Academy of SciencesBeijingPeople’s Republic of China
  3. 3.Institute for Plant Nutrition and Soil Science, Christian Albrecht University KielKielGermany
  4. 4.Institute for Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Forschungszentrum KarlsruheGarmisch-PartenkirchenGermany
  5. 5.School of Integrative BiologyUniversity of QueenslandBrisbaneAustralia

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