摘要
运用DNDC模型模拟分析不同节灌、施肥、控排条件下稻田氮素平衡状况及氮肥利用效率。结果表明,节水灌溉控制排水条件下,施氮量不大于180kg/hm2时,稻田土壤氮库均呈现亏损,亏损量为54.7～127.6kg/hm2,亏损量随着施氮量的增加而逐渐减小;除浅灌深蓄中氮和浅灌深蓄高氮处理外,控制排水处理土壤氮素亏损量均大于常规排水;浅灌深蓄、施中氮和控制排水的组合是最佳的水肥处理模式。
The nitrogen balance and nitrogen use efficiency under different conditions of irrigation methods, fertilization levels, controlled drainage were analyzed by DNDC model. The result showed that the soil ni- trogen pool was in loss under all modes, and its amount ranged from 54.7 to 127.6 kg/hm^2, which decreased slowly with the increasing nitrogen fertilization consumption. Except for the GIF1 and GIF2 modes, nitrogen loss in soils under controlled drainage mode was greater than conventional drainage mode. The combination of shallow irrigation and deep reservoir, medium level of nitrogen consumption and controlled drainage was proved to be the best water and fertilizer mode.
出处
《灌溉排水学报》
CSCD
北大核心
2013年第2期52-56,共5页
Journal of Irrigation and Drainage
基金
"十二五"农村领域国家科技计划项目(2012BAD08B05-3)
