It was found that the humus layer in black soil region was thick in north and thin in south, which was due to the climatic condition and soil-forming process.
研究发现，深厚黑土主要分布于黑土区北部，中厚与薄层黑土则分别集中在黑土区的中部和南部，这主要与黑土分布区的气候条件和黑土的成土过程有关。
The contents and distribution of soil microelement follow certain regularity in the process of soil-forming.
在成土过程中，土壤微量元素的含量分布具有一定的规律性。
Under the artificial vegetation, soil forming process has been started although it is still in an initial stage, and the biological sand-fixing effect is obvious.
人工调控下的绿地，流沙开始成土发育，但发育仍处于初级较低水平，生物固沙取得明显效果。
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