the steppe degeneration
草原退化
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The soil density of control area of every soil layers of four sample plots in the meadow steppe and typical steppe is lower than the severe degeneration area;
草甸草原、典型草原样地各土层对照区土壤密度均低于重度退化区。
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