From the top layer to the bottom, the Hg content in the soils changed little in D. augustifolia marsh, but varied greatly in corn field and lowland rice field.
2
更让人大跌眼镜的是，其他两棵书的年轮中汞含量为零，尽管其附近的土壤中含有汞。
More surprising still, the rings of the other two trees were mercury-free, despite there being mercury in nearby soil.
3
不同成熟度垃圾的上覆土壤中汞都具有次表面样品总汞含量高于表面样品的特点，但变化趋势不同。
Although all sub-surface samples contain higher mercury than surface samples, the contents of Hg in profile soil overlying garbages of different maturities show different trends of variation.
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