【摘要】 [目的]为小麦/玉米轮作体系的氮素优化管理提供依据。[方法]在冀中南小麦/玉米轮作体系自然生产条件下,对2 m土体氮素循环及盈亏变化进行研究。[结果]小麦/玉米轮作周期氮素变化呈"M"型;氮素纵向移动性较强,深层土壤仍含有较高量氮素。[结论]在当前生产条件下,小麦/玉米轮作氮素循环呈盈余状态,氮肥施用应以减、控为主。更多还原

【Abstract】 [Objective]The research aimed to provide the basis for nitrogen optimal management of wheat and maize rotation. [Method]Under the natural production condition of wheat and maize rotation in middle and south area of Hebei Province,the nitrogen rotation and profit and loss in 2 m soil mass were studied. [Result]The change of nitrogen cycling in wheat and maize rotation showed M shape. The mobility of nitrogen in the length direction was strong. And the content of nitrogen in the deep layer was high. [Conclusion] Under the current production condition, the nitrogen cycling of wheat and maize rotation was surplus. And more attention should be paid in the reduction and the control of the nitrogen application.更多还原