干旱区研究2026，Vol.43Issue(1)：86-95,10.DOI:10.13866/j.azr.2026.01.08
乌拉特后旗典型荒漠区土壤碳分布特征及影响因子
Soil carbon distribution characteristics and influencing factors in typical desert areas of Urad Rear Banner
摘要
Abstract
To improve our understanding of the distribution characteristics of soil carbon in the arid desert areas of Northwest China,the typical desert area in the western part of Urad Rear Banner was chosen as the research object.Through a combination of profile investigation,sample collection,and laboratory analysis,the distribution characteristics of soil organic carbon and inorganic carbon content in the region and influencing factors were ex-plored.The overall soil organic carbon content in the region decreased with increasing soil depth,falling from 1.92 g·kg−1 in the 0-20 cm layer to 0.57 g·kg−1 at depths exceeding 1 m,whereas the overall soil inorganic car-bon content increased with increasing soil depth,rising from 5.13 g·kg−1 in the 0-20 cm layer to 8.71 g·kg−1 at depths exceeding 1 m.The average inorganic carbon content in each soil layer was several fold greater than the organic carbon content,and the soil inorganic carbon content was 4.31-fold greater than the organic carbon con-tent in the 0-120 cm layer.Soil organic carbon and inorganic carbon content exhibited high variability.Among soil physical and chemical factors,factors excluding available phosphorus and available Kalium exhibited signifi-cant or highly significant linear correlations with soil organic and inorganic carbon content.The random forest re-gression model could explain 25%of the variation in soil organic carbon content and 70%of that in inorganic car-bon content.Cation exchange capacity,ammonium nitrogen,silica,silt content,iron oxides,and sand content were identified as significant influencing factors for organic carbon content(all P<0.05),whereas silica,sand con-tent,iron oxides,and silt content were highly significant influencing factors for inorganic carbon content(all P<0.01).This study provides basic data support for research on carbon cycling processes and the evaluation of car-bon sink capacity in desert ecosystems.关键词
荒漠地区/有机碳/无机碳/分布特征/影响因子Key words
desert area/organic carbon/inorganic carbon/distribution characteristics/influencing factors引用本文复制引用
关伟涛,李永利,王媛,王昌宇,边鹏,周文辉..乌拉特后旗典型荒漠区土壤碳分布特征及影响因子[J].干旱区研究,2026,43(1):86-95,10.基金项目
中国地质调查局项目(DD20230469)资助 （DD20230469）
