区域土壤有机碳密度及碳储量计算方法探讨

Calculation Method for Density and Storage of Soil Organic Carbon

土体中有机碳含量在纵向和横向上都具有空间相关性。本文利用曲周县四疃乡30个土壤剖面的有机碳含量数据,采用常见的纵向拟合方法建立了基于30个土壤剖面有机碳测定数据的对数函数拟合模型,计算得到研究区的土壤有机碳密度和碳储量分别为5.60kg C m-2和4.72×108kgC;又根据研究区土壤剖面中有机碳含量分布的不规则性特点,通过对土壤剖面层次的归一化处理,利用地统计横向插值方法,计算得到该区的土壤有机碳密度和碳储量分别为3.95kg Cm-2和3.33×108kgC。由于两种算法对数据的组织方式不同,得到的土壤有机碳密度和碳储量存在较大差异。两种方法适用于土壤有机碳在剖面中分布形式不同的土壤类型。

The content of soil organic carbon was interrelated spatially at both vertical and horizontal direction in soil. Based on the data of 30 soil profiles of Situan town, Quzhou county, We studied the methods for simulating the distribution of soil organic carbon in vertical and horizontal, and calculated the density of soil organic carbon and the storage of soil organic carbon in research area. The results are as followings： the density of soil organic carbon and the storage of soil organic carbon in research area are 5.60 kg C m^-2 and 4.72×10^8kg C respectively by the vertical simulating method;while the density of soil organic carbon and the storage of soil organic carbon in research area are 3.95 kg C m^-2 and 3.33×10^8kg C respectively by the Kriging spatial interpolation method. The different results are due to the difference of calculating methods that organize the data from different way. The two methods are suitable to different soils that are different in soil organic matter distribution.