中国农业大学学报2025，Vol.30Issue(12)：99-111,13.DOI:10.11841/j.issn.1007-4333.2025.12.09
合理耕层构造对东北黑土农田土壤结构及有机碳含量的影响
Effects of optimal tillage structure on soil structure and organic carbon in farmland of northeastern black soil
摘要
Abstract
To address the issues of structural degradation and organic carbon loss resulting from long-term intensive use and inadequate maintenance of Northeast black soil,this study aims to clarify the regulatory effects of optimal tillage(OT)on the physicochemical properties of black soil and organic carbon.Two treatments of OT and conventional tillage(PT)were set up in the experimental field of Jilin Agricultural University.Soil bulk density,porosity,aggregate stability,and soil organic carbon(SOC)content were measured.and theT soil structure and SOC mass fraction changes of reasonable plow layer structure were analyzed using methods such as variance analysis,redundancy analysis(RDA)and random forest model.The results revealed that,compared to PT,the OT treatment can improve soil structure,with a 5.45％reduction in bulk density and an optimized porosity of 56.24％in the 0-10 cm soil layer.Additionally,the proportion of aggregates larger than 0.250 mm,mean weight diameter(MWD),and geometric mean diameter(GMD)increased by 18.89％,51.22％,and 68.42％,respectively.The unstable aggregate index(ELT)decreased by 64.5％.The OT treatment significantly enhanced the SOC content at 0-10 cm,10-20 cm,and 20-30 cm soil depths(P＜0.05),with increases of 48.07％,15.31％,and 10.74％compared to PT,respectively.RDA indicated that soil bulk density,porosity,moisture content,and aggregate stability(MWD,GMD,proportion of aggregates greater than 0.250 mm)were key factors influencing SOC.The results of the random forest model further demonstrated that soil depth,moisture content,and aggregate stability significantly contributed to SOC,with aggregate stability mitigating organic carbon mineralization losses.In summary,the implementation of appropriate tillage structures optimizes soil properties,reduces bulk density and compaction,and enhances aggregate stability,thereby creating a suitable physical environment for organic carbon sequestration.This represents an effective measure for enhancing the carbon storage capacity and improving the quality of black soil,providing theoretical support for the protection and sustainable utilization of black soil Northeast China.关键词
合理耕层构造/团聚体稳定性/固碳/黑土地保护Key words
optimal tillage/soil aggregate stability/carbon storage/black soil protection分类
农业科技引用本文复制引用
GAO Jian,WANG Haifeng,XU Tingting,YOU Wenjia,GAO Ye,ZHANG Yao,WANG Yixiang,SHI Miao,ZHENG Hongbing,JI Dongming,LI Chunrong,MEI Nan,LIU Ming,SU Rongjiu,YU Ying,YU Zhongyu,XU Sheng..合理耕层构造对东北黑土农田土壤结构及有机碳含量的影响[J].中国农业大学学报,2025,30(12):99-111,13.基金项目
吉林农业大学高层次人才项目(202020581) （202020581）
吉林省科技发展计划项目(20220302008NC) （20220302008NC）
国家自然科学基金项目(31501248) （31501248）
国家重点研发计划项目(2016YFD03002) （2016YFD03002）
