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栗钙土是半干旱地区典型的地带性土壤,主要分布在内蒙古自治区。文章以内蒙古自治区乌兰察布盟(简称乌盟)和锡林河流域为例,分析了栗钙土有机碳和无机碳含量及其密度的剖面分布特征,旨在了解不同土地利用方式下土壤碳库的储量和分布特点及其成因与机理。结果表明:土壤无机碳在剖面上的分布有两种类型:高—低—(高)—(低)型和低—高—(低)—(高)型,后者可能是由于土壤侵蚀引起的碳酸盐再分布所形成的。100cm深的土壤有机碳密度的平均值为8.48kg·m-2,退耕地>耕地>干旱半干旱草原>典型草原,主要分布在表层,0～30cm土壤有机碳密度为0～100cm的43%左右;而土壤无机碳密度的平均值为7.10kg·m-2,退耕地>典型草原>耕地>干旱半干旱草原,主要分布在下层土壤,50～100cm无机碳密度为0～100cm的58%左右。
Chestnut soil is a typical semi-arid zone soil, mainly in Inner Mongolia Autonomous Region. Taking Wulanchabu League in Inner Mongolia Autonomous Region (UUM) and Xilin River Basin as an example, the paper analyzes the profile distribution characteristics of organic carbon and inorganic carbon in chestnut soil and its density, and aims to understand the distribution of soil under different land use patterns Carbon stock reserves and distribution characteristics and their causes and mechanisms. The results showed that there are two types of distribution of soil inorganic carbon in the profile: high - low - (high) - (low) and low - high - (low) - (high), which may be caused by soil erosion Carbonate redistribution formed. The mean value of soil organic carbon density at 100cm depth was 8.48kg · m-2, and the area of returning cultivated land> arable land> arid and semi-arid steppe> typical steppe was mainly distributed in the surface layer. The organic carbon density in 0-30cm soil was 43% , While the mean value of soil inorganic carbon density was 7.10kg · m-2, and the area of returning cultivated land> typical steppe> arable land> arid and semi-arid steppe mainly distributed in the lower soil. The density of 50 ~ 100cm inorganic carbon was 58% about.