中文摘要：

利用中国第二次土壤普查确定的886个典型地带性土种剖面资料，通过统计分析方法研究了地点因素（土纲、质地、海拔、酸碱度和土地利用方式）对地带性土壤表层有机碳含量的影响．结果表明，地点因素显著影响地带性土壤表层有机碳含量；地点因素对耕作土壤表层有机碳的影响明显强于非耕作土壤；地点因素分别解释耕作土壤和非耕作土壤表层有机碳含量变异的24．7％和48．5％．耕作土壤和非耕作土壤有机碳含量的主要控制因素有所不同．

英文摘要：

An understanding of influences of site variables on surface soil organic carbon （SOC） concentration is important to plan future land use for carbon sequestration and sustaining agricultural production. This study was conducted to clarify the effects of site variables （soil order, texture, altitude, acidity/alkalinity and land use） on surface SOC concentration of zonal mils of China. The results showed that the SOC concentration was generally correlated significantly with the selected site variables （p〈0. 001 ） and the correlation was stronger in un-cultivated soils than in cultivated soils. The ANOVA factorial model estimated that the contribution of site variables to the variation of SOC concentration was 24.7 % in cultivated soils, 48.5 % in un-cultivated soils, which was 6,6 % and 10. 4 % higher than that described by univariate multiple regression analysis, respectively. Relatively weak correlations and less explainable variance observed in cu factors over SOC Concentration differ from those in un-cu tivated mils suggest that actual controlling tivated soils,