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[1]Yan Keyu,Li Jing,Chen Zhengfa,et al.Effects of tillage practices on soil CO2 emissions in red soil sloping farmland[J].Research of Soil and Water Conservation,2025,32(02):140-149,157.[doi:10.13869/j.cnki.rswc.2025.02.013]

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Effects of tillage practices on soil CO₂ emissions in red soil sloping farmland

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 32 Number of periods: 2025 02 Page number: 140-149,157 Column: Public date: 2025-01-20

Title:: Effects of tillage practices on soil CO₂ emissions in red soil sloping farmland

Author(s):: Yan Keyu^1,2, Li Jing^1,2, Chen Zhengfa^1,2, Duan Qingsong^1,2, Wang Daoxiang^1,2, Hu Yanmei^1,2; (1.College of Water Conservancy, Yunnan Agricultural University, Kunming 650201, China; 2.Green Smart Agricultural Field and Carbon Emission Reduction Engineering Research Center of University in Yunnan Province, Kunming 650201, China)

Keywords:: soil CO₂ emissions; tillage practices; red soil sloping farmland; crop growth period

CLC:: S152; S153

DOI:: 10.13869/j.cnki.rswc.2025.02.013

Abstract:: [Objective]This study aims to investigate the effects of various tillage practices on soil carbon dioxide(CO₂)emissions in red soil sloping farmland in order to establish a theoretical foundation for developing a sustainable, low-carbon farming model and optimizing agricultural practices in this type of terrain. [Methods]By setting up experimental plots for four typical tillage practices, including cross-slope ridge tillage(RT), down-slope tillage(DT), plastic mulching(PM), and conventional tillage(CT), a structural equation model was established to explore the relationship between soil physicochemical properties and soil CO₂ emissions. Additionally, a comprehensive evaluation model was utilized to quantitatively analyze the carbon reduction and yield increase benefits of different tillage practices. [Results]The soil organic carbon and total nitrogen contents of the soil in the RT treatment were generally higher, which significantly increased the total porosity of the soil and reduced soil bulk density(p<0.05). Conversely, these parameters were the opposite in the DT treatment. The soil temperature and moisture content in the PM treatment were significantly higher than those in the other tillage practices, and the soil temperature and moisture content in the ridge treatments represented by RT and DT were significantly higher than those in CT. During the crop growth period, the soil CO₂ emission flux under different tillage practices ranged from 60.53 to 818.90 mg/(m²·h), showing a fluctuating trend of first increasing and then decreasing. The cumulative soil CO₂ emissions among the different tillage practices decreased in the order:PM>DT>CT>RT, with RT significantly reducing emissions by 3.4% to 22.4%(p<0.05). The emission levels during the crop growth stages decreased in the order:granulation stage>ear stage>seedling stage. Rainfall erosion had a significant Birch effect on soil CO₂ emissions in red soil sloping farmland. After rainfall erosion, the soil CO₂ emission flux among different tillage practices decreased in the order:DT>PM>CT>RT in red soil sloping farmland. Soil CO₂ emission flux was mainly influenced by adjustments in soil temperature, soil moisture content, total nitrogen, and bulk density. [Conclusion]RT plays a positive role in reducing soil CO₂ emissions and increasing crop yield, is a favorable practice in southern red soil sloping farmland.

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Last Update: 2025-01-20