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-formingprocess.
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。
3
Under the artificial vegetation, soilformingprocess has been started although it is still in an initial stage, and the biological sand-fixing effect is obvious.