GEOGRAPHICAL RESEARCH ›› 2007, Vol. 26 ›› Issue (6): 1077-1086.doi: 10.11821/yj2007060002

• Earth Surface Processes • Previous Articles     Next Articles

A study on the influence of soil organic carbon density and its spatial distribution in Anhui Province of China

XU Xin-wang1,2,3, PAN Gen-xing1, CAO Zhi-hong3, WANG Yan-lin3   

  1. 1. Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China;
    2. Department of Resources and Environment Science, Chizhou College, Chizhou 247000, China;
    3. Department of Geography,Anhui Normal University,Wuhu 241000, China
  • Received:2007-03-23 Revised:2007-08-14 Online:2007-11-25 Published:2007-11-25
  • Supported by:

    国家自然科学基金重点项目 (40231016);国家自然科学基金国际合作重大项目 (40710019002);安徽省教育厅自然科学基金(2006kj187B)

Abstract:

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/hm2 and average carbon density of topsoil is 29t/hm2. 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/ hm2 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 revealed that human and natual factors can exert effects on soil carbon pool. So we must pay attention to land use and natural factor changes affecting soil and ecosystem carbon cycle.

Key words: soil organic carbon, spatial distribution, influencing factors, Anhui Province