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camada de solo
environ.
土层
(由内部的再分配过程所产生的独特的连续层土壤。传统的土壤层被分为A,B,C三层。A层是最上层,含有腐殖质,被浸出和/或多种矿物质淋溶。B层形成沉淀区,富含粘土矿物和来自A层的铁/铝氧化物。C层是当前土壤的母质,部分可能是风化岩,运输冰川或冲积土材料或者是更早的土壤。)
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