世界上消耗最大的土壤一些在非洲，土壤中的有机物含量不到1%，这不到良好生产含量的一半。
Africa has some of the most exhausted soils in the world, with less than 1% of organic matter in them, half the level required for good fertility.
受垃圾渗滤液影响，垃圾场周边土壤有机物含量增加。试验结果显示，随着土壤有机物含量的增加，土壤中有效态铁锰含量增大。
With the influence of waste leachate seeping, the concentration of organic substances in landfill soil was higher than that in unpolluted soil.
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