托克托县不同土地利用类型土壤有机碳和碳密度分布

Distribution of Soil Organic Carbon and Carbon Density under Different Land Use Types in Tuoketuo County

对内蒙古托克托县4种典型土地利用类型土壤50cm剖面各层的土壤含水率、土壤容重和有机碳含量进行测定，研究了该地区土壤有机碳（SOC）和有机碳密度（SOCD）分布特征。结果表明，4种土地利用类型的SOC含量和SOCD均为表层较高，沿土壤剖面垂直变化总体呈下降的趋势。农田、枸杞林和草地3种土地利用类型土壤表层0-20cm各层SOC含量和SOCD均高于底层，防护林地表层0～30cm各层SOC含量高于底层。土地利用类型对SOC和SOCD有一定的影响，4种不同土地利用类型的SOC含量和SOCD从高到低依次为草地〉防护林〉枸杞林〉农田。草地、防护林和枸杞林对土壤有机碳的贮存优于农田地。

To obtain distribution characteristics of soil organic carbon （SOC） and soil organic carbon density （SOCD） in study area, moisture content, hulk density and organic carbon of each soil layer （10cm） in 50cm soil profile were measured under different typical land use types in Takeout county of Inner Mongolia. The result showed that the general trend of distribution characteristics of SOC and SOCD were declined with the increase of soil depth for all 4 kinds of land use types. SOC and SOCD were high- er in the planting layers 0 - 20cm than deeper layers for Cropland, plantation of Lycium barbarum L. and grassland, but higher in layers 0 ~ 30cm for shelter forest. Content of SOC and SOCD was followed as grassland 〉 shelter forest 〉 plantation 〉 cropland, which showed land use types effected on SOC and SOCD. In land use types, the content of SOC in grassland, shelter forest and plantation were more than cropland in this study.