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以广西第二次土壤普查的土壤剖面数据为基础,结合广西1:50万的土壤图以及相关的地形DEM图和行政区划图,在GIS平台下对广西表层土壤有机碳密度和储量进行了估算,对不同土壤类型、不同区域的土壤有机碳分布特征进行了分析,并将结果与全国其他省市地区的研究成果进行了对比。结果表明:广西表层土壤有机碳密度分布不均,呈现桂北高,桂南低的空间分布特点;中等海拔地区高,低海拔地区低;黄壤高,砖红壤低。有机碳密度均值为3.33 kg/m2,低于全国平均水平4.70 kg/m2;表层土壤有机碳库储量为6.42×1011kg,占全国表层土壤有机碳储量的1.5%。
Based on the data from the soil profiles of the second soil survey in Guangxi and the 1: 500,000 soil maps of Guangxi and the related topographic maps and administrative maps, the organic carbon concentrations and stocks of topsoil in Guangxi were estimated under the GIS platform , The characteristics of soil organic carbon distribution in different soil types and different regions were analyzed, and the results were compared with the research results of other provinces and cities nationwide. The results showed that the surface soil organic carbon density in Guangxi was unevenly distributed, showing the low spatial distribution pattern of northern Guangxi and southern Gui. The middle and high altitude areas were low and the low altitude areas were low. The yellow soil was high and the red brick soil was low. The average density of organic carbon was 3.33 kg / m2, which was lower than the national average of 4.70 kg / m2. The surface soil organic carbon storage was 6.42 × 1011 kg, accounting for 1.5% of the total surface organic carbon storage in China.