中文摘要：

假设土壤分发是连续的常规方法是为估计土壤不合适在石灰岩地区常见的地形区域的器官的碳密度(SOCD ) 因为它的不连续的土壤分发。在石灰岩地区常见的地形区域的 SOCD 的精确评价为在中国的碳隐遁评价是必要的。在这研究，一个修改方法，当计算 SOCD 时，在侧面考虑土壤区域的垂直比例，被开发在西南中国在一个典型石灰岩地区常见的地形山峰簇消沉区域估计 SOCD。在修改方法，渗透地面的雷达(GPR ) 技术被用来检测土壤的分发和厚度。方法的精确性通过比较被证实，数据用一个确认方法，土壤厚度被挖掘在测量获得了。与常规方法和 average-soil-depth 方法比较，用 GPR 方法估计的 SOCD 关于用确认方法获得了那显示出最小的相对错误。在地区性的规模，在 020 厘米和 0100 厘米的深度的平均 SOCD，被平常的 kriging 插入内推，是 1.49 (从 0.035.65 ) 并且 2.26 (0.0911.60 ) kgm ² 基于在我们的学习区域的 GPR 方法(分别地盖住 393.6 hm ²), 。因此，修改方法能在象石灰岩地区常见的地形区域那样的不连续的土壤区域在 SOCD 的精确评价上被使用。

英文摘要：

The conventional method which assumes the soil distribution is continuous was unsuitable for estimating soil organic carbon density（SOCD） in Karst areas because of its discontinuous soil distribution. The accurate estimation of SOCD in Karst areas is essential for carbon sequestration assessment in China. In this study, a modified method,which considers the vertical proportion of soil area in the profile when calculating the SOCD, was developed to estimate the SOCD in a typical Karst peak-cluster depression area in southwest China. In the modified method, ground-penetrating radar（GPR） technology was used to detect the distribution and thickness of soil. The accuracy of the method was confirmed through comparison with the data obtained using a validation method, in which the soil thickness was measured by excavation. In comparison with the conventional method and average-soil-depth method,the SOCD estimated using the GPR method showed the minimum relative error with respect to that obtained using the validation method. At a regional scale, the average SOCDs at depths of 0-20 cm and 0-100 cm, which were interpolated by ordinary kriging,were 1.49（ranging from 0.03-5.65） and 2.26（0.09-11.60） kgm-2based on GPR method in our study area（covering 393.6 hm2）, respectively. Therefore, the modified method can be applied on the accurate estimation of SOCD in discontinuous soil areas such as Karst regions.