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Volume 16, issue 18 | Copyright

Special issue: East Asia emissions assessment (EA2)

Atmos. Chem. Phys., 16, 11853-11866, 2016
https://doi.org/10.5194/acp-16-11853-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 23 Sep 2016

Research article | 23 Sep 2016

Drainage and tillage practices in the winter fallow season mitigate CH4 and N2O emissions from a double-rice field in China

Guangbin Zhang1, Haiyang Yu1,2, Xianfang Fan1,2, Yuting Yang1,2, Jing Ma1, and Hua Xu1 Guangbin Zhang et al.
  • 1State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
  • 2University of Chinese Academy of Sciences, Beijing 100049, China

Abstract. Traditional land management (no tillage, no drainage, NTND) during the winter fallow season results in substantial CH4 and N2O emissions from double-rice fields in China. A field experiment was conducted to investigate the effects of drainage and tillage during the winter fallow season on CH4 and N2O emissions and to develop mitigation options. The experiment had four treatments: NTND, NTD (drainage but no tillage), TND (tillage but no drainage), and TD (both drainage and tillage). The study was conducted from 2010 to 2014 in a Chinese double-rice field. During winter, total precipitation and mean daily temperature significantly affected CH4 emission. Compared to NTND, drainage and tillage decreased annual CH4 emissions in early- and late-rice seasons by 54 and 33kgCH4ha−1yr−1, respectively. Drainage and tillage increased N2O emissions in the winter fallow season but reduced it in early- and late-rice seasons, resulting in no annual change in N2O emission. Global warming potentials of CH4 and N2O emissions were decreased by 1.49 and 0.92tCO2 eq.ha−1yr−1, respectively, and were reduced more by combining drainage with tillage, providing a mitigation potential of 1.96tCO2 eq.ha−1yr−1. A low total C content and high C/N ratio in rice residues showed that tillage in the winter fallow season reduced CH4 and N2O emissions in both early- and late-rice seasons. Drainage and tillage significantly decreased the abundance of methanogens in paddy soil, and this may explain the decrease of CH4 emissions. Greenhouse gas intensity was significantly decreased by drainage and tillage separately, and the reduction was greater by combining drainage with tillage, resulting in a reduction of 0.17tCO2 eq.t−1. The results indicate that drainage combined with tillage during the winter fallow season is an effective strategy for mitigating greenhouse gas releases from double-rice fields.

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