作物学报2025，Vol.51Issue(5)：1277-1285,9.DOI:10.3724/SP.J.1006.2025.43043
耕层构造后东北旱作农田土壤有机碳组分积累及其稳定性特征
Characteristics of soil organic carbon fraction accumulation and its stability in dry-crop farmland in northeast China after plough layer construction
摘要
Abstract
Tillage structure is a critical agricultural practice that influences the accumulation of soil organic carbon(SOC)and the growth and development of maize.Investigating changes of post-tillage structure on the accumulation and stability of SOC frac-tions is essential for understanding mechanism of carbon fixation and fertilization in the spring maize region of Northeast China and for establishing optimal tillage structures.This study is based on a 14-year field experiment initiated in 2009,employing a randomized block design to evaluate the impacts of four tillage treatments:up-loose and down-compaction plough layer(ULDC,CK),all-loose plough layer(AL),furrow-loose and ridge-compaction plough layer(FLRC),and all-compaction plough layer(AC).The treatments were assessed for their effects on the accumulation and stability of SOC fractions.The results demonstrated that tillage layer structure significantly influenced SOC content in the 0-15 cm and 15-35 cm soil layers,with the AC treatment promoting greater SOC accumulation in the 0-15 cm layer.Tillage structure also altered the distribution of particulate organic carbon(POC)and mineral-associated organic carbon(MAOC)and their proportions within SOC.Specifically,the AC treatment significantly increased MAOC content in the 0-15 cm soil layer by 34.2%compared to the ULDC treatment,while decreasing MAOC content in the 15-35 cm soil layer by 22.2%.The variation in POC content across soil layers was closely related to dif-ferent tillage construction methods.Correlation analysis revealed that the POC/SOC ratio was highly positively correlated with soil microbial biomass carbon(MBC)(r=0.74**),while the MAOC/SOC ratio was significantly negatively correlated with MBC(r=-0.69*).These findings suggest that tillage structure influences the distribution of carbon components within the carbon pool,modulated SOC stability.This study highlights the critical role of rational tillage structure in regulating SOC fractions and en-hancing their stability,providing a scientific basis for soil health management and tillage structure optimization.In conclusion,the AC treatment demonstrated the potential to promote SOC fraction accumulation and improve soil carbon pool stability,offering practical value for the development of sustainable tillage practices in dryland farming systems in western Liaoning.关键词
耕层构造/土壤有机碳/有机碳组分/稳定性/旱作Key words
plough layer structure/soil organic carbon/soil organic carbon fraction/stability of soil organic carbon pool/dry farming引用本文复制引用
邹逸淼,于湘萍,苗玉聪,蔡倩,杜桂娟,赵凤艳,张诗雨,李双异,白伟..耕层构造后东北旱作农田土壤有机碳组分积累及其稳定性特征[J].作物学报,2025,51(5):1277-1285,9.基金项目
本研究由国家自然科学基金项目(32272232),中国科学院战略性先导科技专项(XDA28090202),辽宁省"揭榜挂帅"科技攻关专项计划课题(2021JH1/1040003902)和辽宁省农业科学院学科建设项目(120520303)资助. This study was supported by the National Natural Science Foundation of China(32272232),the Strategic Priority Science and Technology Project of the Chinese Academy of Sciences(XDA28090202),the Science and Technology Research Project of Liaoning Province(2021JH1/1040003902),and the Discipline Construction Project of Liaoning Academy of Agricultural Sciences(120520303). （32272232）
