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As the biggest "carbon sinks" and "carbon source" of terrestrial ecosystems, soil organic carbon plays a crucial role in global warming and agricultural production. Both of natural and human factors has a momentous influence on soil organic carbon. The cultivated soil of mountainous and hilly area located in Yunyang County was selected as the object area of research. Elevation, slope, parent materials, slope position and Topography Wetness (TWI) are considered as essential factors for soil organic carbon. In addition, category variables were introduced into the regression model through path analysis, the mechanism of factors on cultivated Soil Organic Carbon (SOC) density was discussed. The variability of SOC density was gained by border analysis and anisotropic analysis. The results show that the average, 0-20 cm, cultivated SOC density is 2.91 kg/m and the cultivated soil carbon storage is 1838.75×106 kg in the study area. The correlation between elevation and SOC density is significant (0.329**). Topography wetness index (TWI) also has great correlation with SOC density (0.256**). Areas covered by Graybrown purple mud (shale) efflorescence and Purple sand and mud (shale) efflorescence have lower SOC density. The sequence of SOCD in different slope position is: Valley>slope foot>ridge>slope shoulder>slope back. From spatial variation aspect, anisotropic analysis illuminates that, spatial variability of SOC density is more drastic in south-north orientation than in east-west orientation.

Soil Organic Carbon Storage and Influencing Factors in Southwest Mountainous Area