底层土壤的反硝化作用是土壤排放N_2O的重要来源，同时也是影响浅层地下水硝酸盐含量的重要因素。
Denitrification in subsurface is the important source of N2O emission from soil. It is also a key factor of affecting NO3 content of shallow groundwater.
由表层至底层，小叶章湿地土壤中汞含量变化不大，水稻田及玉米地中汞含量变化较大。
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.
“平面型”犁底层剖面构造有利于改善土壤结构。
The plow pan profile constitution of the flat type helps to improve soil structure.
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