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土壤饱和导水率反映了土壤的入渗性质,是研究水分在土壤中运动规律的重要水力参数。利用Guelph入渗仪测量了科尔沁地区樟子松林、灌木林和草地0-20cm、20-40cm和40-60cm三个不同土层深度的土壤饱和导水率,分析了这三种类型沙地土壤饱和导水率的差异及其随土层深度的变化特征。结果表明:1)平均土壤饱和导水率樟子松林较大,草地次之,而灌木林较小,它们的平均取值在0.63～12.50mm/min范围内;随土层深度增加,樟子松林土壤饱和导水率逐渐增大,而草地的逐渐减少,灌木林的随土层深度变化不大;2)樟子松林和灌木林土壤饱和导水率与容重显著负相关;灌木林和草地土壤饱和导水率与细沙百分含量显著负相关,而与中沙百分含量显著正相关;樟子松林和草地土壤饱和导水率与粗沙百分含量显著正相关。
Soil saturated hydraulic conductivity reflects the infiltration properties of soils and is an important hydraulic parameter for studying the movement of water in soils. The saturated hydraulic conductivity of soil at depths of 0-20cm, 20-40cm and 40-60cm in Pinus sylvestris var. Mongolica, shrubbery and grassland in Horqin area was measured by Guelph infiltration meter. Difference of Saturated Hydraulic Conductivity and Its Variation with Soil Depth. The results showed that: 1) The mean saturated hydraulic conductivity of Pinus sylvestris var. Mongolica forest was larger than that of grassland, while the shrub forest was smaller. Their mean values ranged from 0.63 to 12.50mm / min. With the increase of soil depth, The saturation hydraulic conductivity of the pine forest increased gradually, while the grassland decreased gradually, while the depth of the shrub forest did not change much with the depth of the soil. 2) The saturated hydraulic conductivity and soil bulk density of Pinus sylvestris var. Mongolica and shrub forest were negatively correlated; There was a significant negative correlation between soil saturated hydraulic conductivity and the percentage of fine sand and a significant positive correlation with the percentage of middle and sandy soil. Saturated hydraulic conductivity of Pinus sylvestris var. Mongolica and grassland had a significant positive correlation with the percentage of coarse sand.