生态学报2026，Vol.46Issue(4)：1992-2003,12.DOI:10.20103/j.stxb.202411302939
1987-2011年亚热带季风区土壤有机碳变化特征
Changes in soil organic carbon within subtropical monsoon region from 1987 to 2011:a case study of Jiangxi Province
摘要
Abstract
Soil organic carbon(SOC)is one of the most significant carbon reservoirs in terrestrial ecosystems.In subtropical monsoon climate regions,changes in SOC exert considerable influence on the carbon cycle.Taking Jiangxi Province as the study area and considering soil formation factors and data availability,37 characteristic variables were selected to develop a spatial extrapolation model of 0-100 cm soil organic carbon density(SOCD).This model enabled the mapping of SOCD distribution in Jiangxi Province for the years 1987 and 2011.This study further analyzed the characteristics of changes in total soil organic carbon(TSOC)and the carbon sequestration rate.The following conclusions were drawn:(1)Based on the statistical analysis of soil sampling results,the mean SOCD increased from 3.70 kg C/m2 to 12.52 kg C/m2 between 1987 and 2011.Specifically,the mean SOCD for forest rose from 4.37 kg C/m2 to 13.99 kg C/m2,while that of cropland increased from 2.92 kg C/m2 to 5.94 kg C/m2;(2)The random forest(RF)model demonstrated strong performance in simulating the spatial distribution of SOCD for the year 2011(R2=0.73,RMSE=6.22 kg C/m2);however,due to limitations in available characteristic data,the simulation accuracy for 1987 was lower;(3)According to simulation results,the soil in Jiangxi Province exhibited significant carbon sink potential during the period from 1987 to 2011.The average SOCD increased from 3.62 kg C/m2 to 11.57 kg C/m2,with forest SOCD rising from 4.13 kg C/m2 to 14.01 kg C/m2;cropland SOCD increased from 2.89 kg C/m2 to 7.43 kg C/m2,and grassland SOCD rose from 2.98 kg C/m2 to 8.83 kg C/m2.Furthermore,TSOC increased from 0.605 Pg C to 1.932 Pg C,with the carbon sequestration rate ranked as:forest＞grassland＞farmland.关键词
土壤有机碳/数字土壤制图/碳储量变化/环境变量Key words
soil organic carbon/digital soil mapping/carbon stock changes/environmental variables引用本文复制引用
陈玲玲,胡梅,张起明,齐述华..1987-2011年亚热带季风区土壤有机碳变化特征[J].生态学报,2026,46(4):1992-2003,12.基金项目
国家自然科学基金项目(42361062) （42361062）
