水土保持研究2025，Vol.32Issue(2)：140-149,157,11.DOI:10.13869/j.cnki.rswc.2025.02.013
耕作措施对红壤坡耕地土壤CO2排放的影响
Effects of tillage practices on soil CO2 emissions in red soil sloping farmland
摘要
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.关键词
土壤CO2排放/耕作措施/红壤坡耕地/作物生育期Key words
soil CO2 emissions/tillage practices/red soil sloping farmland/crop growth period分类
农业科技引用本文复制引用
颜科宇,李靖,陈正发,段青松,王道祥,胡燕梅..耕作措施对红壤坡耕地土壤CO2排放的影响[J].水土保持研究,2025,32(2):140-149,157,11.基金项目
云南省基础研究计划面上项目(202201AT070272) （202201AT070272）
云南省农业基础研究联合专项面上项目(202301BD070001-033) （202301BD070001-033）
云南省教育厅科学研究资助项目(2023Y1015) （2023Y1015）
云南省作物生产与智慧农业重点实验室开放基金课题(2022) （2022）
