The content of mineral-fixed ammonium in soil was related not only to soil clay minerals but also to fertilization.
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 contents of fixed ammonium were higher than those in soil of North Hunan region and in soil of red earth region , and were a main N resource in the province.
高于湖南省以北地区土壤和本地区地带性土壤—红壤的固定态铵含量，是该地区的一项重要的土壤氮素资源。
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