最重要的土壤因子是土壤发生层厚度。
Among the soil Characteristics, soil depth is the most important.
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。
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.
在土壤干旱胁迫下，叶绿体的片层结构发生严重的扭曲并在中央部分形成电子密度较高的黑色团块物质。
Under soil drought stress lamella structure of chloroplast wrenched obviously and there was a black area, which had high electron density in the middle of chloroplast.
“波浪型”剖面耕层土壤比“平面型”剖面更容易发生干旱现象，这可能是黑土区土壤易出现干旱现象的主要原因。
Therefore, "wave type" section cultivated horizon may occur drier phenomenon much easier than "flat type" section. This may be the main reason why drier phenomena easily happen in the black soil.
“波浪型”剖面耕层土壤比“平面型”剖面更容易发生干旱现象，这可能是黑土区土壤易出现干旱现象的主要原因。
Therefore, "wave type" section cultivated horizon may occur drier phenomenon much easier than "flat type" section. This may be the main reason why drier phenomena easily happen in the black soil.
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