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Effects of controlled irrigation on global warming potential based on CH4, N2O and CO2 fluxes in plateau paddy field

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  • Shufang Wang

    (College of Water Conservancy, Yunnan Agricultural University, Kunming, Yunnan, P.R. China
    Yunnan University Green Smart Farmland and Carbon Emission Engineering Research Center, Kunming, Yunnan, P.R. China)

  • Hongchun Bi

    (College of Water Conservancy, Yunnan Agricultural University, Kunming, Yunnan, P.R. China)

  • Liping Wang

    (College of Water Conservancy, Yunnan Agricultural University, Kunming, Yunnan, P.R. China)

  • Jing Wang

    (College of Water Conservancy, Yunnan Agricultural University, Kunming, Yunnan, P.R. China)

  • Ying Wang

    (College of Water Conservancy, Yunnan Agricultural University, Kunming, Yunnan, P.R. China
    Yunnan University Green Smart Farmland and Carbon Emission Engineering Research Center, Kunming, Yunnan, P.R. China)

  • Lihong Chen

    (College of Water Conservancy, Yunnan Agricultural University, Kunming, Yunnan, P.R. China)

Abstract

A suitable irrigation pattern is of great significance for reducing greenhouse gas emissions. In this study, field experiments and a denitrification-decomposition (DNDC) model were used to study the global warming potential based on CH4, N2O and CO2 fluxes under flooding irrigation and controlled irrigation in paddy fields in the Erhai Lake basin. The results showed that the average value of CH4 flux under controlled irrigation was lower than that under flooding irrigation, with a reduction range of 43.21% to 48.88%, however, the average value of the N2O and CO2 fluxes from paddy field under controlled irrigation were higher than those under flooding irrigation. Controlled irrigation patterns can significantly reduce the global warming potential in paddy fields based on CH4, N2O and CO2 fluxes. Controlled irrigation can effectively reduce the global warming potential per unit yield. For water management in the Erhai Lake basin, it is recommended the controlled irrigation treatment of soil moisture with an upper limit of 100% and a lower limit of 75-85% with irrigation, and a maximum surface water depth of 150-200 mm lasting for five days after precipitation from the jointing-booting stage to the milk stage.

Suggested Citation

  • Shufang Wang & Hongchun Bi & Liping Wang & Jing Wang & Ying Wang & Lihong Chen, 2024. "Effects of controlled irrigation on global warming potential based on CH4, N2O and CO2 fluxes in plateau paddy field," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 70(9), pages 535-542.
    • Handle: RePEc:caa:jnlpse:v:70:y:2024:i:9:id:453-2023-pse
    DOI: 10.17221/453/2023-PSE
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    References listed on IDEAS

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    1. Le Qi & Hai-Dong Niu & Peng Zhou & Rui-Jie Jia & Ming Gao, 2018. "Effects of Biochar on the Net Greenhouse Gas Emissions under Continuous Flooding and Water-Saving Irrigation Conditions in Paddy Soils," Sustainability, MDPI, vol. 10(5), pages 1-17, May.
    2. Ye Yuan & Xiaoqin Dai & Huimin Wang, 2019. "Fertilization effects on CH4, N2O and CO2 fluxes from a subtropical double rice cropping system," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 65(4), pages 189-197.
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