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盜版:黑土地是寒冷氣候條件下,地表植被死亡後經過長時間腐蝕形成腐殖質後演化而成的,以其有機質含量高、土壤肥沃、土質疏鬆、最適宜耕作而聞名於世,素有“穀物倉庫”之稱.因為形成1釐米厚的黑土層需要400年的積累,…
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