【摘要】 为研究永定河流域官厅水库南岸生态水源保护林土壤饱和导水率(K_fs)的特征,科学评价水源保护林功能,选取水源保护林典型林分与当地成林和非林地作对比,采用方差分析、相关分析和因子分析的方法研究土壤理化性质对饱和导水率的影响并根据因子得分排名探究土壤通透性最好的林分。结果表明:（1）土壤饱和导水率随土层深度增加而减小,水源保护林中混交林的饱和导水率大于纯林接近于成林,侧柏×山杏混交林的饱和导水率最高;（2）因子分析结果表明,影响饱和导水率最主要的因素为饱和含水量、容重和有机质含量;次重要因子为土壤砂粒、粉粒和粘粒含量,土壤毛管孔隙度和非毛管孔隙度对本区域饱和导水率影响不大;（3）综合因子得分排名分析,以侧柏×山杏混交林的土壤通透性最好,油松×山杏混交林次之。目前生态水源保护林对土壤通透性的改善优势明显,造林颇具成效。更多还原

【Abstract】 In order to explore the characteristics of saturated hydraulic conductivity(K_fs) of the soils of the south coast of Guanting Reservoir in Yongding River watershed and to assess the function of water resource protection forests scientifically, this study used typical water resource protection forest stands as study objects, which were compared with local mature forests and non-forest land. Variance analysis, correlation analysis, and factor analysis methods were applied to investigate the influence of edaphic physical and chemical properties on saturated hydraulic conductivity, and the forest stands with the best soil permeability were screened according to the score ranking of influencing factors. The results showed that:（1） Saturated hydraulic conductivity decreased as the soil depth increased. The saturated hydraulic conductivity of mixed forests of water resource protection forests was greater than that of pure forests but similar to that of mature forests, among which Platycladus orientalis and Armeniaca sibirica mixed forest had the highest K_fs value;（2） Factor analysis indicated that the primary factors affecting K_fs were saturated moisture, soil bulk density, and soil organic matter content, while the secondary influencing factors were the contents of sand, silt, and clay in soil. Soil capillary porosity and non-capillary porosity had little effects on the K_fs value;（3） According to the score ranking of the comprehensive factors, soil permeability in the P. orientalis and A. sibirica mixed forest was the best, followed by that in the mixed forest of Pinus tabuliformis and A. sibirica. The present study demonstrated that ecological water conservation forests have the superiority in improving soil permeability, and that the afforestation project has shown remarkable achievements.更多还原