基于ArcGIS的县域耕地表层土壤有机碳储量估算r——以洪江市为例

摘要

基于农业部第三批测土配方施肥项目实施县洪江市耕地地力评价和测土配方施肥项目的数据成果,运用ArcGIS技术对洪江市耕地表层土壤有机碳储量进行估算,对洪江市耕地表层土有机碳储量及空间分布特征进行研究,并根据估算结果分析了不同类型耕地土壤有机碳储量的变化.研究发现洪江市面积加权平均土壤有机碳密度为41.50t/hm2,储量为1.20×106t.洪江市耕地土壤以水稻土为主,耕地土壤有机碳密度东南地区较高,西部中部及流域地区较低.%Based on the data of soil productivity assessment on cultivated land and soil testing and land formulated fertilization of the Honghu where the third batch of soiling testing and land formulated fertilization project issued by agriculture department is implemented,this paper made estimation on the reserve of organic carbon contained in surface soil of cultivated land in Honghu with ArcGIS technology and made research on the organic carbon reserves of surface soil of cultivated land in Honghu and the characteristics of its spatial distribution,and analyzed the change of the reserves of organic carbon contained in various kinds of cultivated land according to the estimation.According to the research,the area-weighted average organic carbon density in Honghu was 41.50t/hm2,the reserves was 1.20 ×106t.The mian soil in Honghu is paddy soil,as for the density of organic carbon contained in soil,it is relatively high in southest and it is low in west and the central areas and watersheds.