NDLI: Effects of irrigation on nitrous oxide, methane and carbon dioxide fluxes in an Inner Mongolian steppe

Content Provider	Springer Nature Link
Author	Liu, Chunyan Holst, Jirko Brüggemann, Nicolas Butterbach Bahl, Klaus Yao, Zhisheng Han, Shenghui Han, Xingguo Zheng, Xunhua
Copyright Year	2008
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 mg 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.
Starting Page	748
Ending Page	756
Page Count	9
File Format	PDF
ISSN	02561530
Journal	Advances in Atmospheric Sciences
Volume Number	25
Issue Number	5
e-ISSN	18619533
Language	English
Publisher	SP Science Press
Publisher Date	2008-09-27
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	nitrous oxide methane carbon dioxide semi-arid steppe irrigation precipitation Geophysics/Geodesy Meteorology/Climatology
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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