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Chechng upon Models of Predicting the Intensity and Quantity of Nitrogen Mineralization on Dryland

Ju Xiaotang;Li Shengxiu(Deparment of Natural Resources and Environment Protection,Northwestern AgricultureUniversity,Yangling,Shaanxi 712100)  
The predicting values of the intensity and quantity of nitrogen mineral-ization were checked up with maize,winter wheat plot experiment in fields.The soil mineralizable nitrogen potential(N0)was calculated from first-order dynamic equation.The suitability of two models of nitrogen mineralization ratio constant(K)affected by soil temperature that we have set had been compared.The results of Stanford et al.for quantity of nitrogen mineralization affected by soil moisture were used.As the restults showing,the model of leaching at intervals without sands was good for predicting the intensity and quantity of nitrogen mineralization in maize growing season and both of the models were not good for winter wheat because the variation of soil temperature was big and the quantity of nitrogen uptaking sharply increased in the period of returning growth.
【Fund】: 国家自然科学基金
【CateGory Index】: S158.3
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