关键词: 土壤有机碳, 时空变异, 地统计学, 半干旱区

Abstract: A clear understanding of the spatial and temporal variation characteristics of soil organic carbon can provide an important guarantee for the dynamic monitoring of soil quality and the scientific utilization of land resources. The geostatistic was used to analyze the temporal and spatial variation of SOC content in Aohan Chifeng based on soil survey data. The result showed that the mean contents of SOC in 1985 and 2014 were 6.91 and 7.49 g·kg-1. And the spatial distribution characteristics gradually decreased from south to north. In 1985, soil organic carbon content had a strong spatial autocorrelation in the research scale. After 30 a of change, the average increase of soil organic carbon in agriculture, forestry and grassland was 5.92%, 10.22% and 8.47%, respectively. The soil organic carbon content was significantly improved after the restoration of forest return, grass and sandy vegetation.The spatial autocorrelation distance of soil organic carbon was shortened. The soil organic carbon content was significantly improved after the restoration of forest return, grass and sandy vegetation.

Key words: soil organic carbon, spatio-temporal variability, geostatistics, semi-arid region