泥沙研究2026，Vol.51Issue(3)：16-23,8.DOI:10.16239/j.cnki.0468-155x.2026.03.003
黄土区典型流域土壤有机碳-无机碳转化及驱动因素
Transformation of soil organic-inorganic carbon and driving factors in a typical watershed of the Loess region
摘要
Abstract
The soil carbon pool in arid and semi-arid regions maintains dynamic balance to dominate the car-bon cycle through the sequestration and decomposition of soil organic carbon(SOC)and the precipitation and reformation of soil inorganic carbon(SIC).In nutrient-poor drylands,SIC constitutes the dominant fraction,yet the mechanisms underlying SOC-SIC transformation remain poorly understood.In this study,field sampling and carbon stable isotope analysis were conducted in the Manliangou watershed,Inner Mongolia,the transfor-mation mechanisms of soil organic-inorganic carbon and their driving factors have been revealed.Results show that artificial forests and grasslands significantly enhance SOC content,with the highest levels in the forest land,while SIC can be accumulated in deeper layers;bare gully slopes exhibit the highest surface SIC con-tent.Soil respiration on bare gully slopes releases the largest amount of CO2,leading to stronger SOC-SIC transformation than that in restored areas,although the overall transfer amount is relatively low(0.039 g/kg).Particulate organic carbon dominates SOC-SIC transformation in grasslands,while woodland is driven by soil moisture.关键词
土壤有机碳/土壤无机碳/生态修复措施/稳定碳同位素技术/碳转移量Key words
soil organic carbon(SOC)/soil inorganic carbon(SIC)/ecological restoration measures/stable carbon isotope technique/carbon transfer amount分类
农业科技引用本文复制引用
张健先,张铁钢,张永娥,张晓明,陈庆伟,朱元吉,刘博..黄土区典型流域土壤有机碳-无机碳转化及驱动因素[J].泥沙研究,2026,51(3):16-23,8.基金项目
国家电网有限公司总部管理科技项目(5200～202055134A-0-0-00 and SGTYHT/19-JS-215) （5200～202055134A-0-0-00 and SGTYHT/19-JS-215）
