Effects of Irrigation on Nitrous Oxide, Methane and Carbon             Dioxide Fluxes in an Inner Mongolian Steppe

LIU Chunyan; Jirko HOLST; Nicolas BRUGGEMANN; Klaus BUTTERBACH-BAHL; YAO Zhisheng; HAN Shenghui; HAN Xingguo; ZHENG Xunhua

doi:10.1007/s00376-008-0748-3

Volume 25 Issue 5

Sep. 2008

Article Contents

Article > ADVANCES IN ATMOSPHERIC SCIENCES > 2008 > 25(5): 748-756

Effects of Irrigation on Nitrous Oxide, Methane and Carbon Dioxide Fluxes in an Inner Mongolian Steppe

1.
State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences (IAP--CAS), Beijing 100029; Institute for Meteorology and Climate Research, Atmospheric Environmenta;Institute for Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Karlsruhe Research Centre, Kreuzeckbahnstrasse 19, 82467 Garmisch-Partenkirchen, Germany;Institute for Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Karlsruhe Research Centre, Kreuzeckbahnstrasse 19, 82467 Garmisch-Partenkirchen, Germany;Institute for Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Karlsruhe Research Centre, Kreuzeckbahnstrasse 19, 82467 Garmisch-Partenkirchen, Germany;State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences (IAP--CAS), Beijing 100029;State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences (IAP--CAS), Beijing 100029;Institute of Botany, Chinese Academy of Sciences (IB-CAS), Beijing 100093;State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences (IAP--CAS), Beijing 100029

doi: 10.1007/s00376-008-0748-3

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Abstract:
Increased precipitation during the vegetation periods was observed in and further predicted for Inner Mongolia. The changes in the associated soil moisture may affect the biosphere-atmosphere exchange of greenhouse gases. Therefore, we set up an irrigation experiment with one watered (W) and one unwatered plot (UW) at a winter-grazed Leymus chinensis-steppe site in the Xilin River catchment, Inner Mongolia. UW only received the natural precipitation of 2005 (129 mm), whereas W was additionally watered after the precipitation data of 1998 (in total 427 mm). In the 3-hour resolution, we determined nitrous oxide (N2O), methane (CH4) and carbon dioxide (CO2) fluxes at both plots between May and September 2005, using a fully automated, chamber-based measuring system. N2O fluxes in the steppe were very low, with mean emissions (±s.e.) of 0.9±0.5 and 0.7±0.5 μg N m-2 h-1 at W and UW, respectively. The steppe soil always served as a CH4 sink, with mean fluxes of -24.1±3.9 and -31.1±5.3 μg C m-2 h-1 at W and UW. Nighttime mean CO2 emissions were 82.6±8.7 and 26.3±1.7 μg C m-2 h-1 at W and UW, respectively, coinciding with an almost doubled aboveground plant biomass at W. Our results indicate that the ecosystem CO2 respiration responded sensitively to increased water input during the vegetation period, whereas the effects on CH4 and N2O fluxes were weak, most likely due to the high evapotranspiration and the lack of substrate for N2O producing processes. Based on our results, we hypothesize that with the gradual increase of summertime precipitation in Inner Mongolia, ecosystem CO2 respiration will be enhanced and CH4 uptake by the steppe soils will be lightly inhibited.
- nitrous oxide,
- methane,
- carbon dioxide,
- semi-arid steppe,
- irrigation,
- precipitation
References

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