---

作 者 ：刘青丽, 任天志, 李志宏, 张云贵, 石俊雄

期 刊 ：植物营养与肥料学报 2010年 16卷 2期 页码：400-406

关键词：黄壤；有机氮矿化；模型；烟草；

Keywords:tobacco,

摘 要 ：研究不同温度和水分条件下植烟土壤有机氮的矿化动态，为田间土壤氮素矿化的预测提供依据。采用好气间歇淋洗方法，探求不同温度培养模式［恒温20℃，恒温35℃，变温（5、10、15、20、25、30、35、30、25、20℃）］，不同温度（5～40℃）与不同土壤含水量（风干土～53%）交互作用下的土壤有机氮矿化动态，并建立回归方程。运用田间土壤氮素矿化数据，进行模型验证。结果显示，变温培养下土壤氮素矿化动态与恒温培养显著不同，变温下土壤矿化氮的累积动态以积温模型的拟合效果最好； 指数模型能够较好描述土壤有机氮矿化对土壤水分含量的反应。在土壤氮素矿化积温模型和水分函数的基础上，建立了变化温度与水分条件下的土壤氮素矿化模型。田间实测矿化数据验证了此模型的可行性。因此，可以利用有效积温和土壤含水量来估测田间土壤氮素矿化量。

Abstract:Soil organic nitrogen mineralization dynamics were studied under different temperatures and soil water contents in order to provide the basis of forecasting soil nitrogen mineralization in fields. Intermittent leaching aerobic incubation was adopted to develop dynamic simulation models of organic nitrogen mineralization in yellow soil under different incubations which include constant temperature at 20℃, constant temperature at 35℃ and fluctuating temperature (5, 10, 15, 20, 25, 30, 35, 30, 25 and 20℃), different temperatures, ranging from 5℃ to 40℃, and various soil water contents, ranging from air-dried soil water content to 53%. Soil nitrogen mineralization in field was used to validate the simulation. The results show the soil nitrogen mineralization dynamics under fluctuating temperature is significantly different from soil nitrogen mineralization under the constant temperature incubations, and the fluctuating temperature incubation can improve soil nitrogen mineralization. The simulated dynamics of cumulative nitrogen mineralization is best by using cumulative temperature as a variable. The soil nitrogen mineralization under different soil water contents is modeled preferably by applying an exponent model. Base on the cumulative temperature model and exponent model, a new model is developed by using cumulative temperature and soil water content as variables. The mineralization is also simulated well by using the field measured data. Therefore, the soil nitrogen mineralization in fields can be forecasted well by using daily temperature and soil moisture as the inputs.

---