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Methane and nitrous oxide emissions from three paddy rice based cultivation systems in Southwest China

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Abstract

To understand methane (CH4) and nitrous oxide (N2O) emissions from permanently flooded rice paddy fields and to develop mitigation options, a field experiment was conducted in situ for two years (from late 2002 to early 2005) in three rice-based cultivation systems, which are a permanently flooded rice field cultivated with a single time and followed by a non-rice season (PF), a rice-wheat rotation system (RW) and a rice-rapeseed rotation system (RR) in a hilly area in Southwest China. The results showed that the total CH4 emissions from PF were 646.3±52.1 and 215.0±45.4 kg CH4 hm−2 during the rice-growing period and non-rice period, respectively. Both values were much lower than many previous reports from similar regions in Southwest China. The CH4 emissions in the rice-growing season were more intensive in PF, as compared to RW and RR. Only 33% of the total annual CH4 emission in PF occurred in the non-rice season, though the duration of this season is two times longer than the rice season. The annual mean N2O flux in PF was 4.5±0.6 kg N2O hm−2 yr−1. The N2O emission in the rice-growing season was also more intensive than in the non-rice season, with only 16% of the total annual emission occurring in the non-rice season. The amounts of N2O emission in PF were ignorable compared to the CH4 emission in terms of the global warming potential (GWP). Changing PF to RW or RR not only eliminated CH4 emissions in the non-rice season, but also substantially reduced the CH4 emission during the following rice-growing period (ca. 58%, P<0.05). However, this change in cultivation system substantially increased N2O emissions, especially in the non-rice season, by a factor of 3.7 to 4.5. On the 100-year horizon, the integrated GWP of total annual CH4 and N2O emissions satisfies PF≫RR≈RW. The GWP of PF is higher than that of RW and RR by a factor of 2.6 and 2.7, respectively. Of the total GWP of CH4 and N2O emissions, CH4 emission contributed to 93%, 65% and 59% in PF, RW and RR, respectively. These results suggest that changing PF to RW and RR can substantially reduce not only CH4 emission but also the total GWP of the CH4 and N2O emissions.

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Authors and Affiliations

  1. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China

    Jiang Changsheng  (江长胜), Wang Yuesi  (王跃思), Zheng Xunhua  (郑循华), Huang Yao  (黄耀) & Hao Qingju  (郝庆菊)

  2. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China

    Zhu Bo  (朱波)

  3. Graduate University of the Chinese Academy of Sciences, Beijing, 100039, China

    Jiang Changsheng  (江长胜) & Hao Qingju  (郝庆菊)

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  1. Jiang Changsheng  (江长胜)
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  2. Wang Yuesi  (王跃思)
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  3. Zheng Xunhua  (郑循华)
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  5. Huang Yao  (黄耀)
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  6. Hao Qingju  (郝庆菊)
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Jiang, C., Wang, Y., Zheng, X. et al. Methane and nitrous oxide emissions from three paddy rice based cultivation systems in Southwest China. Adv. Atmos. Sci. 23, 415–424 (2006). https://doi.org/10.1007/s00376-006-0415-5

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  • DOI: https://doi.org/10.1007/s00376-006-0415-5

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