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NO_3—N在土壤剖面中移动的时空动态。结果表明,NO_3—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NO_3—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NO_3—N含量在淋失高峰期可达10mgN.L^(-1)以上。此外,NO_3—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。^(15)N示踪结果表明,在春小麦前期尿素中的酰胺态氮或NH_4—N在0-20cm土层中直接移动,而来自肥料的NO_3—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NO_3—N移动。
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.
出处
《植物营养与肥料学报》
CAS
CSCD
1995年第2期71-79,共9页
Journal of Plant Nutrition and Fertilizers
基金
北京市自然科学基金
