中文摘要：

区域土壤碳储量和碳固定潜力及影响因素分析是全球变化中碳循环研究的重要前沿问题。本文采用第二次土壤普查资料,研究了安徽省不同类型土壤的有机碳密度和碳库,分析了影响土壤有机碳分布的自然和人为因素。结果表明,安徽土壤有机碳库为0.71Pg,表层土壤有机碳库为0.28Pg;土壤平均有机碳密度达117.54 t/hm2,碳密度的空间分布为：皖南山区〉皖西大别山区〉沿长江平原〉江淮丘陵区〉淮北平原区;气候和植被控制着表层土壤有机碳的省域分布,降水与土壤有机碳含量呈正相关。地形和母质影响土壤亚类间有机碳的差异;土壤总氮与土壤有机碳呈极显著相关,平原区土壤粘粒含量与表层土壤有机碳固定有较大关系。

英文摘要：

Carbon storage and sequestration is considered to be an important issue in the study of terrestrial C cycling and global climatic change. This paper mainly makes use of basic information of the second national soil survey, studies organic carbon density and pool of different soil types in Anhui Province, and also analyses natural and artificial factors which influence the distribution of SOC. The results showed total organic carbon pool of Anhui Province is 0. 71Pg, and total storage of topsoil organic carbon pool is 0. 28Pg, accounting for 40% of soil organic carbon pool. Soil average carbon density is 117.54t/hm^2 and average carbon density of topsoil is 29t/hm^2. SOC density in Anhui Province is lower than Jiangsu , Fujian and Guangdong provinces, indicating that there is great potential soil carbon pool in Anhui SOC density of burozem and that meadow soils of hilly area is high, but SOC density of the lithosols and yellow cinnamon soil is rather low. SOC density of paddy soil up to 114. 37 tC/hm^2 is higher than other soils. The spatial distribution pattern of topsoil organic carbon density in Anhui Province is： SOC density in the southeastern part is higher than the northwestern part, SOC density in southern Anhui mountainous region is the highest and the lowest in northern Anhui plain is the least. The order of SOC density in its five different geographical areas. The distribution of top SOC relates to the physical geographical factors such as climate, vegetation types, terrain, parent material, etc. The precipitation and vegetation types restrict provincial distribution of SOC, there is significant positive correlation between precipitation and soil. Terrain and parent material influence organic carbon distribution pattern of the subsoil species. Soil pH value,cohesive soil content and total nitrogen content affect SOC content. These conclusions can be used to analyze soil carbon pool change under agriculture land use in China. The difference between soil carbon density and carbon pool in Anhui Province