滇西山地土壤有机碳储量及其分布特征

对中小尺度土壤有机碳储量的研究是提高大尺度区域研究精度的基础。根据云南省第二次土壤普查中大理州158个典型土壤剖面的理化性质及其分布面积实测值,对大理州土壤的有机碳储量进行了估算和分析。结果表明,大理州土壤全剖面的平均有机碳密度为17.88kg.m-2,高于全国的平均水平(8.00-10.53kg.m-2);碳储量为470.68×106t。有机碳密度和碳储量在不同土壤类型间的变化较大,分别介于6.32-51.85kg.m-2和0.06×106-137.36×106t之间。大理州土壤有机碳密度和碳储量的分布特征总体都表现为西北部高、东南部低。

Storage and distribution of mountain soil organic carbon in west Yunnan

The research on medium and small-scale soil organic carbon storage was the basis of improving the accuracy of large-scale study. The soil organic carbon storage in Dali Autonomous Prefecture was estimated and analyzed, according to the physiochemical property and distribution area of 158 typical soil profiles from the second soil survey of Yunnan Province. The result showed that the average soil organic carbon density in Dali Autonomous Prefecture was about 17.88 kg·m~(-2),which was higher than the national level. The total amount of soil organic carbon storage was about 470. 68×10~6 t. The soil organic carbon density and storage were variation among different soil types. The soil organic carbon density varied from 6.32 to 51.85 kg·m~(-2).Meanwhile,soil organic carbon storage ranged from 0. 06×10~6 to 137. 36×10~6 t. The distribution of soil organic carbon density and storage were both higher in northwest and lower in southeast in general.