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。
The karstification had decided the red clay characteristic in the early time in soil forming process and the matter origin is different from soil types formed by other rock series;
岩溶作用决定了红粘土的成土早期和物质来源的特点不同于其它岩石形成的土类；
The karstification had decided the red clay characteristic in the early time in soil forming process and the matter origin is different from soil types formed by other rock series;
岩溶作用决定了红粘土的成土早期和物质来源的特点不同于其它岩石形成的土类；
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