In order to avoid the occurrence of dried soil layer, it is necessary to select the tree species with slow growth and low water consumption, and the afforesting density should be reduced.
为防止严重的土壤干层发生，选择生长较缓慢、消耗水分少的树种是必要的，并应减小造林树种植株密度。
How to assess quantitatively the desiccation of deep soil layer is of great importance to determine the reasonable vegetation type and density and guarantee vegetation rehabilitation.
如何定量评价深层土壤的干燥化程度，有助于确定适宜的植被类型和密度，保证人工植被建设的顺利进行。
The mixed forest transformed net increase in forest litter layer of the soil surface allowed the small soil bulk density and larger soil porosity.
改造后的纯林内增加了土壤表面的枯枝落叶层，从而使得其内的土壤容重小，土壤孔隙度变大；
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