为阐释刺柏人工林土壤有机碳的空间变异以及环境因子对有机碳的影响,分层采集0~80cm土层土样,测定有机碳和其他理化指标,分析土壤有机碳的垂直分布特征及土壤有机碳和其他指标之间的关系。结果表明:0~20cm土层中土壤有机碳含量(36.01%)、有机碳密度(34.83%)和有效氮含量(47.06%)均占比较大。土壤有机碳含量与有机碳密度、有效氮含量呈极显著的正相关关系,与土壤容重、pH值呈负相关,与土壤总孔隙度、毛管持水量以及田间持水量之间呈正相关。整个林地土壤剖面有机碳含量垂直分布呈先陡降然后逐渐降低的模式,可通过改变林分结构,补种阔叶树种等措施提高土壤肥力。

To explain the spatial variation of soil organic carbon in Juniper plantation and the influence of environmental factors on organic carbon,soil samples of 0-80 cm profile depth were sampled.Measured the soil organic carbon and other soil properties,analyzed the vertical distribution of soil organic carbon and the relationship between them.The results showed that soil organic carbon content(36.01%),organic carbon density(34.83%) and available nitrogen content(47.06%) in the 0-20cm soil layer were all relatively large.Soil organic carbon content was significantly positively correlated with soil organic carbon density and soil available nitrogen content.Soil bulk density and soil pH value were negatively correlated with soil organic carbon,while soil total porosity,capillary water holding capacity and capacity and field water holding capacity were positively correlated.The vertical distribution of carbon content in the soil profile of the whole forestland shows a pattern of first steep drop and then gradual decrease.Soil fertility can be improved by changing stand structure and replanting broad-leaved trees.