【摘要】 农田氮素（N）淋失是N素损失的重要途径之一。采集土壤溶液并测定其硝态氮（NO₃^--N）,对不同施N肥处理下40～220cm土层的NO₃^--N累积特征进行了研究。结果表明,不同施N肥处理,对不同土层中NO₃^--N累积影响很大。太行山山前平原竭土农田80cm土层和40～160cm土层为NO₃^--N高度聚集层,入冬后麦田NO₃^--N有所累积,易流失;不同土层NO₃^--N累积与N肥投入呈直线关系,N肥过量投入易造成深土层NO₃^--N累积并流失。更多还原

【Abstract】 Nitrogen leaching of farmland is one of the important way of nitrogen loss. By sampling soil solution and analyzing its content of nitrate-N, nitrate-N accumulated characteristics in different N treatments in 40-220cm soil layer are studied. The results showed that the different N treatments affected greatly nitrate-N accumulation in different soil layers. soil nitrate-N has highly accumulated in 80cm and 140-160cm layer and has an increasing trend of N accumulation in winter season. There is a linear correlation between nitrate-N accumulation in different layers and N input. Superfluous N input would arise N accumulating in deep soil and losing.更多还原