Many researches had been done on soil water in Loess Plateau. It was known that the badly-grown artificial forest was caused by the great dried soil layer.
人们对黄土高原土壤水分进行了很多研究，已经认识到较严重的土壤干层是造成延安及以北地区人工林生长不良的主要原因。
参考来源 - 关中平原全新世土壤和土壤水环境研究·2,447,543篇论文数据，部分数据来源于NoteExpress
The research shows that the influx depth of gravity water in soil can indicate the existence of dried soil layer and the degree it developed, which is the key factor to decide the kind of vegetation.
已有的研究表明，土壤中重力水的入渗深度能够指示土壤干层的有无和发育强弱，是决定植被类型的最主要和最关键的因素。
Meanwhile the significance of solving problems about dried soil layer is discussed.
同时，研究指出了解决土壤干层问题的意义。
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。
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