基于1∶100万土壤数据库的中国土壤有机碳密度及储量研究  

Estimation of China soil organic carbon storage and density based on 1∶1000000 soil database.

作　　者：于东升[1] 史学正[1] 孙维侠[1] 王洪杰[1] 刘庆花[1] 赵永存[1] 

机构地区：[1]中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室,南京210008

出　　处：《应用生态学报》2005年第12期2279-2283,共5页Chinese Journal of Applied Ecology

基　　金：中国科学院知识创新工程重大项目(KZCX1-SW-01-19);中国科学院知识创新工程领域前沿项目(ISSASIP0201);中国科学院知识创新工程信息化建设专项(INF105-S);国家自然科学基金重大资助项目(30390080).

摘　　要：基于中国1∶100万土壤数据库,利用土壤有机碳储量和碳密度的空间化表达和计算方法研究中国土壤有机碳密度及储量.土壤空间数据库包含926个土壤类型单元,690个土属类型,94000多个图斑;土壤属性数据库收录了7292个全国各类型土壤的剖面数据,包括81个土壤属性字段.研究采用“土壤类型GIS连接法”实现土壤剖面有机碳密度与图形图斑连接,通过制图单元碳储量求和得出全国或者区域碳储量,并利用面积平均法计算全国及各类型土壤的有机碳平均密度.结果表明,中国的土壤面积共有928.10×104km2,有机碳储量为89.14Pg(1Pg=1015g),土壤平均碳密度9.60kg.m-2,是目前与真值最为接近的研究结果.Based on 1 ： 1 000 000 soil database, and employing the methods of spatial expression, this paper estimated the soil organic carbon storage （SOCS） and density （SOCD） of China. The database consists of 1 ： 1 000 000 digital soil map, soil profile attribution database, and soil reference system. The digital soil map contained 926 soil mapping units, 690 soil families, and 94 000 or more polygons, while the soil profile attribution database collected 7 292 soil profiles, including 81 attribution fields. The SOCDs of soil profiles were calculated and linked to the soil polygons in the digital soil map by the method of “GIS linkage based on soil type”, resulting in a vector map of 1 ： 1 000 000 China SOCD. The SOCS of the country or of a soil could be estimated by summing up the SOCS of all polygons or the polygons of a soil, and their SOCD were the SOCS of them derived by their areas. The estimated SOCS and SOCD of the country was 89.14 Pg （1 Pg= 10^25g） and 9.60 kg·m^-2, respectively, covered all the soils with a total area of 928.10×10^4 km^2, which might be considered closest to the real value.

关 键 词：土壤有机碳储量 土壤有机碳密度 中国土壤数据库 

分 类 号：S159.2[农业科学—土壤学]