Timing of midseason aeration to reduce CH_4 and N_2O emissions from double rice cultivation in China(Mitigation of methane and nitrous oxide emissions from agricultural lands)
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概要
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Midseason aeration (MSA) is an effective way to reduce the combined global warming potential (GWP) of methane (CH_4) and nitrous oxide (N_2O) emissions [GWP (CH_4 + N_2O)] during the rice (Oryza Sativa L.) growing season. Altering timing of MSA would affect CH_4 and N_2O emissions from rice cultivation. To evaluate the mitigation of net GWP (CH_4 + N_2O) from double rice (Oryza Sativa Indica) cultivation by adjusting the time to start MSA, a two-year (2009〜2010) field experiment was conducted in Yingtan, Jiangxi Province, China. Four treatments, i.e. continuous flooding, early aeration, normal aeration (local practice) and late aeration, were adopted in the experiment. Results showed that compared with continuous flooding, midseason aeration significantly reduced seasonal CH_4 emission and net 100-year GWP (CH_4 + N_2O) from double rice cultivation without significant changes in grain yield. In the early rice season, the reductions in CH_4 emission and net 100-year GWP (CH_4 + N_2O) due to midseason aeration varied from 37% to 51% and from 36% to 50%, respectively, being lowest in early aeration and highest in normal aeration. In the late rice season, the reduction in CH_4 emission and net 100-year GWP (CH_4 + N_2O) due to midseason aeration varied between 49% and 57%, being lowest in late aeration and highest in early aeration. The GWP from N_2O emission was negligible compared to that from CH_4 emission. The findings indicated that the GWP in the late rice season could be effectively reduced by advancing suitably the time to start MSA.
著者
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Ma Jing
State Key Laboratory Of Soil And Sustainable Agriculture Institute Of Soil Science Chinese Academy O
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Yagi Kazuyuki
National Inst. For Agro‐environmental Sci. Ibaraki Jpn
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Xu Hua
State Key Laboratory of Luminescent Materials and Devices (South China University of Technology), Guangzhou 510640, China
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MA Jing
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences
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JI Yang
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences:University of Chinese Academy of Sciences
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ZHANG Guangbin
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences
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