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通过对洛川L5-S8黄土和古土壤层的原状土进行水分特征曲线的实验测定,分析了L5-S8各层土壤的持水性能和供水性能等土水特征。结果表明:L5-1-S8-2的持水性、供水性均随吸力值的增大而减弱。L5-1-L8-2的持水性在较低压力段强于相邻下部的S5-1-S8-2,在较高压力段弱于相邻下部的S5-1-S8-2。L5-1-L8-2的供水性能比相邻下部的S5-1-S8-2强。L5-S8黄土和古土壤水分特征差异的直接原因是孔隙大小分配及粘粒含量多少,根本原因是土壤发育过程中冷干和温湿的气候变化。
Soil water characteristics such as water holding capacity and water supply performance of L5-S8 soil were analyzed by measuring the water characteristic curves of undisturbed loess and paleosol in Luochuan L5-S8. The results showed that the water holding capacity and water supply of L5-1-S8-2 all decreased with the increase of suction value. The water holding capacity of L5-1-L8-2 is stronger than that of the adjacent lower part S5-1-S8-2 at the lower pressure and weaker than that of the adjacent lower part S5-1-S8-2 at the higher pressure. The water supply performance of L5-1-L8-2 is stronger than that of S5-1-S8-2 in the adjacent lower part. The direct reason for the difference in water characteristics between L5-S8 loess and paleosol is the distribution of pore size and clay content. The fundamental reason is the climatic change of cold-dry and warm-humid during soil development.