摘要： 通过田间试验，研究了不同氮肥用量和灌水量情况下土壤中硝态氮的动态分布。结果表明，土壤剖面的硝态氮含量随着施氮量的增加而增加，在同一施氮量水平下，随着土壤深度的增加，土壤中硝态氮含量递减。在冬小麦的整个生育期中，拔节期的追肥灌水有助于硝态氮向土壤深处移动，甚至有可能淋洗出根层，对地下水产生影响。

关键词: 冬小麦, 土壤, 硝态氮, 含量, 分布

Abstract: Based on the field experiments of nitrogen fertilizer and irrigat ion applied to winter wheat,the effects of quantity on its dynamic distribution of soil Based on the field experiments of nitrogen fertilizer and irrigat ion applied to winter wheat,the effects of quantity on its dynamic distribution of soil NO₃^- were studied.The results indicated that the content of soil NO₃^- increased with increasing amount of N fert ilizer applicat ion,and under the same level of nitrogen fertilizer,from top soil to deep layer of soil,the content of soil Based on the field experiments of nitrogen fertilizer and irrigat ion applied to winter wheat,the effects of quantity on its dynamic distribution of soil NO₃^- were studied.The results indicated that the content of soil NO₃^- increased with increasing amount of N fert ilizer applicat ion,and under the same level of nitrogen fertilizer,from top soil to deep layer of soil,the content of soil Based on the field experiments of nitrogen fertilizer and irrigat ion applied to winter wheat,the effects of quantity on its dynamic distribution of soil NO₃^- were studied.The results indicated that the content of soil NO₃^- increased with increasing amount of N fert ilizer applicat ion,and under the same level of nitrogen fertilizer,from top soil to deep layer of soil,the content of soil NO₃^- was decreased.According to the amount of NO₃^--N in the deep layer soil during the growth of winter wheat,irrigation and fertilizat ion help to NO₃^- leaching,so it was very easy to seep into groundwater and pollute the environment.was decreased.According to the amount of NO₃^- in the deep layer soil during the growth of winter wheat,irrigation and fertilizat ion help to NO₃^--N leaching,so it was very easy to seep into groundwater and pollute the environment.was decreased.According to the amount of NO₃^- in the deep layer soil during the growth of winter wheat,irrigation and fertilizat ion help to NO₃^- leaching,so it was very easy to seep into groundwater and pollute the environment.were studied.The results indicated that the content of soil NO₃^- increased with increasing amount of N fert ilizer applicat ion,and under the same level of nitrogen fertilizer,from top soil to deep layer of soil,the content of soil NO₃^- was decreased.According to the amount of NO₃^- in the deep layer soil during the growth of winter wheat,irrigation and fertilizat ion help to NO₃^- leaching,so it was very easy to seep into groundwater and pollute the environment.

Key words: Winter wheat, Soil, NO₃^--N, Content, Distribution

中图分类号: 

• S143.01