江苏表层土壤有机碳密度和储量估算和空间分布分析

Organic Carbon Density and Storage in Topsoil of Jiangsu and Spatial Analysis

基于1:50万的江苏土壤图和江苏土壤的数据,运用地理信息系统技术,对江苏表层土壤有机碳密度及储量做出估算,并且分析了土壤有机碳密度的空间分布差异。结果表明:土壤有机碳密度介于4.2kgm-2到20.32kgm-2之间,土壤有机碳储量为673892.8×106kg;土壤有机碳密度具有高度的空间变异性,兴化、南通和无锡的有机碳密度最高,沿海地区的有机碳密度比较高,最低的为淮阴及其附近地区。

Soil organic C plays an essential role in carbon cycle and carbon storage in a native ecosystem reflects that ecosystem's capacity to sequester carbon. Based on soil map of Jiangsu Province (1:500000) combined with a soil database from the soil survey of Jiangsu, topsoil organic carbon storage were estimated for Jiangsu using geographical information system.Carbon density of different soil types ranged from 4.8 kg m^(-2) to 20.32 kg m^(-2).In total, about 0.67 Pg C was stored in topsoil. The amount of carbon varied significantly at different districts in Jiangsu.Huaiyin and neighood had low carbon density, forelang area had more carbon density, Xinghua, Nantong and Wuxi had the most carbon density.