The Quantitatwe Estimate of Fixed ammonium in the nitrogen Cycle

在“氮素循环中固定态铵的量化估算”项目中取得的结果如下：1)田间测算了氮素转化过程中固定态铵的平衡表。钠离子的存在对粘土矿物中铵氮的释放和固定有显著影响。2)估算了土壤氮素循环中固定态铵的释放与硝化菌的关系。3)钾离子的轴向作用。4)在不久的将来，固定态铵对持续农业系统的可持续发展具有重要的作用。

The results obtained in the project of"The Quantitawe Estimate of Fixed Ammonium in the Nitrogen Cycle" are as follows.1) The balance sheet of ammonium fixation in the process of nitrogen transformation has been massured in the field. The release and fixation of ammonium N in clay minerals were significantly affected by the coexistence of sodium con.2)The relationship between release of fixed ammonium and nitrifiers was estimated in the nitrogen cycle of sorl.3)The axtagonism of K con. with ammonium fixation was discussed in the some sorls.4)The fixed ammonium would have an important role to continue the sustainable agriculture system in the close future.