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土壤中有什么
更新时间: 2020-11-12 00:00:00  

土壤是由矿物质、有机质和活的生物有机体以及水分、空气等固、液、气三相组成。按重量计,矿物质可占固相部分的90%~95%以上,有机质约占:1%~10%、因此,土壤是一个以矿物质为主的物质体系。

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