The effect of increased atmospheric carbon dioxide concentration on emissions of nitrous oxide, carbon dioxide and methane from a wheat field in a semi-arid environment in northern China |
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| Authors: | Shu Kee Lam Rob Norton Deli Chen |
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| Institution: | a Melbourne School of Land and Environment, The University of Melbourne, Victoria 3010, Australiab Key Laboratory of Ministry of Agriculture on Agro-environment and Climate Change, Agro-Environment and Sustainable Development Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, Chinac International Plant Nutrition Institute, 54 Florence St. Horsham, Victoria 3400, Australia |
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| Abstract: | There are no reports on the effects of elevated carbon dioxide CO2] on the fluxes of N2O, CO2 and CH4 from semi-arid wheat cropping systems. These three soil gas fluxes were measured using closed chambers under ambient (420 ± 18 μmol mol−1) and elevated (565 ± 37 μmol mol−1) at the Free-Air Carbon dioxide Enrichment experimental facility in northern China. Measurements were made over five weeks on a wheat crop (Triticum aestivum L. cv. Zhongmai 175). Elevated CO2] increased N2O and CO2 emission from soil by 60% and 15%, respectively, but had no significant effect on CH4 flux. There was no significant interaction between CO2] and N application rate on these gas fluxes, probably because soil N was not limiting. At least 22% increase in C storage is required to offset the observed increase in greenhouse gas emissions under elevated CO2]. |
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| Keywords: | Free air carbon dioxide enrichment Nitrous oxide Carbon dioxide Methane Nitrogen fertilizer Irrigation Wheat soil |
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