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。
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。
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