基于1:100万土壤空间数据库的有机碳储量估算研究——以中国东北三省为例

以最近建成的中国1:100万土壤空间数据库以及《中国土种志》和省级土种志的土壤属性为基础,共收集东北三省736个土壤剖面理化分析数据,估算出该地区土壤有机碳总储量,并分析讨论了土壤有机碳密度在空间上的分布特征。结果表明,东北三省土壤有机碳密度平均为16.13 kg/m²,在空间分布上的总趋势为东北部高,西南部低,密度较高的有机碳主要分布在原始森林、湿地及部分农业耕作区中。土壤有机碳密度最高的土类为泥炭土和沼泽土等土类,最低的为石质土、风沙土等土类。

Estimation of Soil Organic Carbon Storage Based on 1:1M Soil Database of China--A Case in Northeast China

Basing on the 1:1 000 000 soil database of China and the data from China's second soil survey, this paper compiles 736 soil profiles in Northeast China to estimate it's organic carbon storage with the method of GIS. This paper also discusses the spatial distribution characteristics of soil organic carbon density. The results show that the average soil organic carbon density is 16.13 kg/m² in the region. And it's spatial distribution trend is high in northeast and low in southwest. The highest carbon density is mainly in virgin forest soils, marsh soils and part of agriculture soils. The soil types with the highest organic carbon density are peat soils and bog soils, and the lowest are Lithosols and Aeolian sandy soils. In the total area of 7.86?10⁵ km² soils in this region, soil organic carbon storage in top 0-1m and top 0-20cm are 12.68Gt and 4.63Gt, respectively. The top 0-20cm carbon storage accounts for 36.5% of the top 0-1m storage. Soil organic carbon storage is mainly distributed in dark brown earth, meadow soils and bog soils. But in mountain meadow soils and Lithosols, carbon storage is less.