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作 者 ：陈子明;袁锋明;姚造华;周春生;傅高明;宋永林;李小平

期 刊 ：植物营养与肥料学报 1995年 1卷 2期 页码：71-79

关键词：NO3-N；氮素移动；淋洗损失；15N；

Keywords:NO3-N, Movement.Leachingloss, 15N,

摘 要 ：利用养分渗滤池研究了北京潮土地区春小麦—夏玉米连作期间NO₃—N在土壤剖面中移动的时空动态。结果表明,NO₃—N的移动同降雨、灌水以及整个土壤系统中的水分状况密切相关。在春小麦期间只有个别处理在0—20cm和20-40cm中有显著移动,而夏玉米期间在0—130cm的土体中NO₃—N发生了“波浪式”的移动。淋失量同当时的降雨量线性相关。130cm深处NO₃—N含量在淋失高峰期可达10mgN.L^-1以上。此外,NO₃—N的移动同尿素施用量的多少有着密切关系,而尿素、硝铵和硫铵等肥料品种之间差异则不明显。¹⁵N示踪结果表明,在春小麦前期尿素中的酰胺态氮或NH₄—N在0-20cm土层中直接移动,而来自肥料的NO₃—N在40—60cm处移动;夏玉米生长期间,在60cm以下深处有大量来自尿素和硝铵等残留标记氮的NO₃—N移动。

Abstract:In lysimeters the NO₃-N change in Chao soil profile was observed during spring wheat and summer corn growing period in Beijing. The results of common chemical analysis indicated that the NO₃-N movement was coresponded with the water condition. During spring wheat growth period the marked movement occrued only from 0-20cm to 20-40cm with certain experimental treatments. However, NO₃-N moved down in the profile like "a wave " during summer corn period, thus it brought up leaching loss of NO₃-N out of 130cm soil body. With ¹⁵N stable istope techenlque the directed movement of NH₄-N and/or (NH₂)₂CO-N was observed in short distance in early stage of spring wheat growth period, and NO₃-N derived from fertilizers might moved down to deeper horizon expecially during later stage and in the treatment with NH₄NO₃.During summer corn period the residual labelled N could moved down in increasing rate with urea treatment or to much dooper with NH₄NO₃ treatment.

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