通过对土壤不同粒级土粒固定态铵含量及其固铵、释铵数量的测定，得到如下结果：粘土矿物种类对土壤固定态铵的影响比粘粒含量更为重要；土壤中，粘粒所含固定态铵数量最大，粉粒也含有相当数量的固定态铵；粘粒、粉粒和砂粒都具有释放其固定态铵的能力 Through the determination of fixed ammonium content and the amount of fixed ammonium and ammonium release in different soil fractions, the following results were obtained: The influence of clay minerals on soil fixed ammonium is more important than the clay content; Soil, clay Contains the largest number of fixed ammonium, silt also contains a considerable amount of fixed ammonium; clay, silt and sand have the ability to release its fixed ammonium