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研究了不同土地类型土壤的贮水性能和入渗特征的变化趋势,研究结果表明:各土地利用类型土壤平均密度(0～100 cm)的变化范围为1.23～1.09 g/cm3,而土壤的总孔隙度逐渐增大,尤其是非毛管孔隙度的增大趋势更为明显,从大到小依次为杨树林地>柠条林地>农闲地>荒地,各种土地利用类型土壤总孔隙度从53.93%上升到59.54%,土壤贮水性能变化趋势与土壤孔隙状况变化趋势一致。1 m土层内饱和贮水量的大小依次为杨树林地(5 953.75 t/hm2)>柠条林地(5 950.53 t/hm2)>农闲地(5 638.72 t/hm2)>荒地(5 392.97 t/hm2),土壤滞留贮水量表现为杨树林地(5 762.91 t/hm2)>柠条林地(5 725.75 t/hm2)>农闲地(5 594.32 t/hm2)>荒地(5 372.99 t/hm2)。各土地类型土壤的入渗特性具有较大差异。植被对土壤的改善效果比较明显,以导致不同土地类型土壤稳定入渗率不同,通过对不同时段累计入渗量的分析,土壤内非毛管孔隙度是土体内维持高的入渗能力的重要原因之一。
The results showed that the average soil density (0 ~ 100 cm) varied from 1.23 to 1.09 g / cm3 for all land-use types, while the total soil total Porosity increased gradually, especially the non-capillary porosity increased more obviously. The order of poplar woodland> Cassia woodland> fallow land> wasteland, the total porosity of various land use types from 53.93% Up to 59.54%. The change trend of soil water storage performance is consistent with the trend of soil pore condition. The saturated water storage capacity in the 1 m soil layer was in the order of poplar (5 953.75 t / hm2)> Caragana forest land (5 950.53 t / hm2)> fallow land (5 638.72 t / hm2)> wasteland (5 392.97 t / hm2). The soil water retention capacity was poplar (5 762.91 t / hm2)> Caragana korshinskii forestland (5 725.75 t / hm2)> fallow land (5 594.32 t / hm2)> wasteland (5 372.99 t / hm2). The infiltration characteristics of soils in different types of land are quite different. Vegetation on the soil to improve the effect is obvious, resulting in different types of soil stability of soil infiltration rate is different, through the analysis of cumulative infiltration at different time intervals, soil non-capillary porosity is to maintain high soil infiltration ability of important reasons one.