赤峰市敖汉旗土壤有机碳含量的垂直分布及其影响因素

Vertical distribution of soil organic carbon content and its influencing factors in Aaohan,Chifeng

选取内蒙古赤峰市敖汉旗为研究对象,运用广义相加模型—分析敖汉旗0—100 cm深度土壤有机碳含量的空间变异特征,分析影响土壤有机碳空间变异的主导因素。结果表明,0—100 cm深度土壤有机碳含量的变化范围为0.23—20.71 g/kg,且随着土壤深度的增加有机碳含量逐渐降低。广义相加模型可以较为准确地解释土壤有机碳含量与环境因素之间的关系。植被因素的变化是影响表层土壤有机碳含量最重要的因素;在深层土壤中,含水率的变化是影响有机碳含量的主要因素。影响土壤有机碳空间变异的主导因素随着土壤深度的变化也表现出较大的差异。

In this study,a soil survey was carried out in Aohan County in Chifeng,Inner Mongolia. A generalized additive model( GAM) was used to analyze the spatial variability of the soil organic content( SOC) in soil depths of 0-100 cm.The results showed that SOC varied from 0. 23 to 20. 71 g/kg in 0-100 cm soil depths,and decreased gradually with increasing soil depths. The GAM fitted the relationship between SOC and environmental factors well. With increasing soil depth,SOC also varied. Vegetation was the dominant factor affecting SOC in surface soil;soil moisture was the dominant factor affecting SOC in deeper soil. The dominant factors that influenced the variation of soil organic carbon also showed considerable differences with increasing soil depth.