铵的矿物固定和吸附是土壤氮素循环中的重要环节。
The fixation and adsorption of ammonium are important parts of nitrogen recycle in soils.
固定态铵的含量不仅与土壤中的粘土矿物有关，施肥对其也有影响。
The content of mineral-fixed ammonium in soil was related not only to soil clay minerals but also to fertilization.
直接的方法就是测定砂粒、粉粒和粘粒中的固定态铵含量。
The direct method is to determine the contents of fixed ammonium in sand, silt and clay.
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