旱地土壤氮素矿化强度及数量预报模式的检验

应用玉米、小麦田间试验检验了土壤氮素矿化强度及数量的预报值。土壤氮素矿化势Ｎ＿０用培养试验所得的一级反应动力学方程求得，对矿化常数Ｋ的温度校正，比较了笔者建立的间歇淋洗加砂模型和间歇淋洗不加砂模型的适用性，对矿化量的水分校正采用Ｓｔａｎｆｏｒｄ等人的研究结果。研究表明，间歇淋洗不加砂模型能很好地预报玉米生长季的土壤氮素矿化强度及数量，两种模型预报小麦生长季中的氮素矿化强度及数量均不理想，这与小麦生长季土壤温度变化大、返青拔节期吸氮肥量剧增有关。

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

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.