草业学报2026，Vol.35Issue(3)：43-51,9.DOI:10.11686/cyxb2025177
土壤碳饱和度对黄土高原温性草原凋落物分解及土壤碳固存的影响
Impact of grassland soil carbon saturation on litter decomposition and soil carbon sequestration
摘要
Abstract
Plant litter is an important source of soil organic carbon(SOC).The formation and stability of SOC are not only directly related to plant carbon input but also affected by soil carbon saturation.In this study,leaves and roots of Stipa bungeana,a dominant species in the temperate grassland of the Loess Plateau,were selected as litter materials.They were co-cultured in the laboratory for 3 years with soils of different carbon saturation levels(with SOC contents of 9.02,5.28,and 2.64 g·kg-1,respectively).The aim was to clarify the impact of soil carbon saturation on litter decomposition and SOC sequestration by analyzing the decomposition rate of litter and the changes in SOC in bulk soil and soil aggregates of various particle sizes under different carbon saturation conditions.The results showed that with decrease in soil carbon saturation,soil microbial biomass carbon gradually increased,while the litter decomposition rate significantly increased,the new carbon formation efficiency(NCE)in the bulk soil and the proportions of aggregates of all particle sizes also gradually increased,and the SOC content significantly increased.This indicates that soils with lower carbon saturation have a higher sequestration efficiency for exogenous organic carbon.Among the three soil aggregate fractions of decreasing size,0.25-2.00 mm,0.053-0.25 mm,and<0.053 mm,as soil carbon saturation decreased,more decomposed litter carbon was allocated to the<0.053 mm aggregates,which is conducive to the formation of mineral-associated organic carbon with high stability.关键词
凋落物/土壤碳饱和度/土壤团聚体/土壤碳稳定性Key words
litter/soil carbon saturation/soil aggregates/soil carbon stability引用本文复制引用
蒋玉奇,郭鑫,姜佳昌,刘兴明,梁春燕,文海燕,牛得草,李旭东..土壤碳饱和度对黄土高原温性草原凋落物分解及土壤碳固存的影响[J].草业学报,2026,35(3):43-51,9.基金项目
甘肃省自然科学基金重点项目(22JR5RA400),甘肃省自然科学基金项目(22JR5RA464),2023年提前批中央财政林业改革发展资金草原科技支撑项目"河西走廊脆弱生态区草原生态健康评估"和甘肃省林业和草原局甘肃省草原监测评价科技支撑项目([2021]794号)资助. （22JR5RA400）
