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对黄土剖面中不同层次的土壤结构特征进行了分析,表明黄土土体的多层次有序网状水文通道体系是黄土地下水补给主要通道;在黄土性古土壤层与红褐色古土壤层互相间成的巨厚黄土剖面内,黄土层和古土壤层的结构、颗粒组成、孔隙组合等特征具有较大的变化,形成水文地质特性差异较大的互层,古土壤中部的粘化层及钙质结核层和黄土层中相对较细密的层次,构成区域的相对隔水层,有效的阻止了地表水的渗漏成为地下水,而这些隔水层的形成又与生物(植被)成壤作用密切相关;黄土层和黄土中的粗粒层形成储导水性很好的水介质层。表明黄土区具有森林植被发育的地质水文条件。
The characteristics of soil structure at different levels in the loess section are analyzed, which shows that the multi-level and orderly mesh hydrological channel system of loess is the main channel of groundwater recharge in loess. In paleosol and loess paleosol layers, Thick loess section, the structure of the loess layer and palaeosol layer, the composition of the granule and the pore assemblage have great changes, forming the inter-layer with large difference in hydrogeological characteristics, the viscous layer in the middle part of the palaeosol and the calcareous The relatively thin layers in the nodule and loess layers, which constitute the relative aquitards in the area, effectively prevent the seepage of surface water to become groundwater, which in turn is closely related to the pedogenesis of the organisms (vegetation) The coarse-grained layers in loess and loess form a well-water-permeable aquifer. This indicates that the loess area has the geological and hydrological conditions for the development of forest vegetation.