【摘要】 为揭示公益林不同区位之间土壤理化性质的变化特征，以甘肃省6个生态区位公益林为研究对象，对100 cm深土层内土壤进行分层取样，并对其8个土壤理化指标进行测定，研究不同区位不同土层间土壤理化特征。结果表明：甘肃省公益林6个生态区位土壤理化性质存在一定的差异性。土壤含水率的变化范围在41.86%～6.83%，在西南高山峡谷区最大，沙地接壤区最小，土壤容重在江河源头区最大为1.56 g·cm^-3，土壤总孔隙度在此生态区位最小为42.61%，两者存在显著负相关关系，土壤有机质在重点自然保护区的含量为74.12 g·cm^-3,显著高于其他各生态区位。土壤理化指标在空间分布上存在一定的规律，土壤含水率与土壤最大持水率随着土层深度的增加呈现出先增加后减小的趋势，两者存在显著正相关，土壤容重随土层深度的增加逐渐增加，而土壤孔隙度随土层深度的增加逐渐减小，两者存在显著负相关。土壤有机质含量和土壤全氮含量具有明显表聚性，在土壤表层量较高，随土层深度的增加逐渐减小，土壤全磷含量与土壤全钾含量在土壤空间分布上无明显变化规律。更多还原

【Abstract】 In order to reveal the change characteristics of soil physical and chemical properties between different locations of public welfare forests, this study took the six ecological locations of public welfare forests in Gansu Province as the research object. The soil in the 100 cm deep soil layer was sampled by layers, and 8 physical and chemical indicators were measured to determine and study the physical and chemical characteristics of soil between different soil layers in different locations. The results showed that: There were certain differences in the physical and chemical properties of soil in the six ecological regions of public welfare forests in Gansu Province. The variation range of soil moisture content was 41.86%-6.83%, which was the largest in the southwest alpine and gorge area, and the smallest in the sandy contiguous area. The soil bulk density was 1.56 g·cm^-3in the source area of the river and the total soil porosity was the smallest in this ecological location. There was a significant negative correlation between the two, and the content of soil organic matter in the key nature reserves was 74.12 g·cm^-3, which is significantly higher than other ecological locations. There was a certain law in the spatial distribution of soil physical and chemical indicators. With the increase of soil depth, both soil moisture content and soil maximum water holding capacity showed a trend of first increasing and then decreasing, and there was a significant positive correlation between them. Soil bulk density gradually increased with the increase of soil depth, while soil porosity gradually decreased with the increase of soil depth, there was a significant negative correlation between them. Soil organic matter content and soil total nitrogen content had obvious surface accumulation, and the amount in the soil surface layer was higher, and gradually decreases with the increase of soil depth. The soil total phosphorus content and soil total potassium content had no obvious changes in the spatial distribution of soil.更多还原