Plant Soil Environ., 2024, 70(9):535-542 | DOI: 10.17221/453/2023-PSE

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

Shufang Wang1,2, Hongchun Bi1, Liping Wang1, Jing Wang1, Ying Wang1,2, Lihong Chen1
1 College of Water Conservancy, Yunnan Agricultural University, Kunming, Yunnan, P.R. China
2 Yunnan University Green Smart Farmland and Carbon Emission Engineering Research Center, Kunming, Yunnan, P.R. China

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.

Keywords: carbon; Oryza sativa L.; climate change; high-altitude area; rainfall

Received: November 16, 2023; Revised: June 8, 2024; Accepted: June 19, 2024; Prepublished online: August 8, 2024; Published: August 29, 2024  Show citation

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Wang S, Bi H, Wang L, Wang J, Wang Y, Chen L. Effects of controlled irrigation on global warming potential based on CH4, N2O and CO2 fluxes in plateau paddy field. Plant Soil Environ. 2024;70(9):535-542. doi: 10.17221/453/2023-PSE.
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