草业学报2025，Vol.34Issue(9)：38-52,15.DOI:10.11686/cyxb2024462
退化高寒草甸土壤有机碳组分变化与增汇潜力研究
Changes in soil organic carbon fractions and carbon sequestration potential of degraded alpine meadows
摘要
Abstract
This study investigates the changes in soil organic carbon(SOC)components and the carbon sequestration potential associated with varying degrees of degradation in alpine meadow soil on the Qinghai-Xizang Plateau.Utilizing the internationally recognized physical grouping method,SOC is categorized into particulate organic carbon(POC)and mineral-associated organic carbon(MAOC).The analysis focuses on the characteristics of SOC component alterations and the carbon sequestration potential in alpine meadow soil subjected to different degradation levels:[no degradation(ND),light degradation(LD),moderate degradation(MD),and heavily degradation(HD)].The findings reveal that light,moderate,and heavy degradation led to reductions in soil organic carbon in the 0-30 cm layer of the alpine meadow by 24.54%,34.45%,and 34.81%,respectively,with significant impacts observed in the 0-10 cm and 10-20 cm layers(P<0.05).Degradation resulted in a decrease of POC by 43.47%-56.01%and MAOC by 17.61%-31.20%,indicating that POC constitutes the primary component of SOC loss.Furthermore,the relative analysis using random forest methodologies identifies soil total nitrogen(TN),bulk density(BD),and pH as the principal influencing factors on soil organic carbon and its components,with soil TN exerting the most significant influence(P<0.01).Correlation analysis indicates a significant positive relationship between SOC,POC,and MAOC with TN,while a negative correlation exists between BD and pH.The study estimates the carbon sequestration potential of the soil(0-30 cm)for the recovery of light,moderate,and heavy degradation in alpine meadows at 1.97,2.78,and 2.86 kg·m-2,respectively.Notably,the surface layer(0-10 cm)contributes 54.93%of the total carbon sequestration,highlighting its critical role in carbon sequestration potential in this region.The research findings provide a theoretical foundation for restoring degraded alpine meadows and offer scientific support for carbon sequestration strategies within grassland ecosystems on the Qinghai-Xizang Plateau.关键词
草地退化/土壤有机碳/颗粒态有机碳/矿物结合态有机碳/土壤碳增汇潜力Key words
grassland degradation/soil organic carbon/particulate organic carbon/mineral-associated organic carbon/soil carbon increment potential引用本文复制引用
冉健民,宋小艳,王丹,王长庭..退化高寒草甸土壤有机碳组分变化与增汇潜力研究[J].草业学报,2025,34(9):38-52,15.基金项目
国家自然科学基金项目(32101350),四川省科技厅自然科学项目(2023NSFSC1190)和西南民族大学研究生"创新型科研项目"重点项目(YCZD2024009)资助. （32101350）
