Advances in Earth Science
1 ，Bao Yuhan
Kan Zezhong，Jin Lixin，Li Zhonghui，Yang Zhenhong，Zhang Hua，Bao Yuhan. Distribution Characteristics and Reserves Estimation of Soil Organic Carbon of Different Physiognomy in Chengdu Economic Zone[J]. Advances in Earth Science, DOI: 10.11867/j.issn.1001-8166.2012.10.1126.
In this paper, we investigate the distribution characteristics of soil organic carbon between different landscape areas in Chengdu Economic Zone with soil organic carbon (SOC) data from multitarget regional geochemical survey. The SOC contents of surface soil in mountain area is the highest, nearly 22g/kg, twice more than the plain area or hilly area which contribute the lowest carbon contents (about 9.49g/kg). There are the similar carbon contents in deep soil between Chengdu plain area and Eastern hilly area, which were lower than the average value (6.99g/kg) of SOC in deep soil of the study area. The unit soil carbon average storage (USCATOC), Organic carbon storage(USCATOC.h) and the abundance index of soil organic carbon (R) with the index model are estimated. The results show that the SOC, USCATOC, USCATOC.h and R in different geomorphic unit have the same features, i.e. the dates in mountain area are high than those in Chengdu plain area, and the hilly area is the lowest. The region of Longmenshan area and southwestern mountainous area which occupy 42% of the measured area contributed to 59% of USCATOC.h and the region of the plain area and the hilly area which occupy 58% of the measured area contributed to 41% of USCATOC.h. The reason resulting to the distribution content differences of USCATOC and USCATOC,h in the different landscape units is mainly because that the various soil organic carbon contents in different landscape units. In addition, it is related to the differences of the parent material, the vegetation development situation, and the land use types.