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中文摘要：
为了解河南烟区烤烟对氮素的吸收分配情况，试验采用^15N分别标记基肥中的铵态氮（^15NH4＋）、基肥中的硝态氮（^15NO3-）以及追肥氮的方法研究了烤烟大田生育期内各器官中氮素的吸收分配规律。结果显示：（1）在整个大田生育期烟株体内氮素积累量不断增加，其中旺长期增幅最大；烟株对土壤氮的积累量显著大于肥料氮，且吸收的氮素50％以上分布在叶片中；烟株根系对氮素的积累在整个生育期都呈现持续增加的趋势。（2）随生育期推进烟株各器官中积累肥料氮量占总氮比例不断降低；不同叶位间，叶片积累肥料氮占总氮的比例一直是：下部叶〉中部叶〉上部叶。（3）烟株在大田移栽后40d～60d期间为氮素积累强度最大时期，随后逐渐减弱，且生育后期烟株对肥料氮的积累表现为负值，而对土壤氮的吸收则表现出滞后性；烟株对基肥中硝态氮的吸收能力强于铵态氮，对追肥中氮素的吸收能力强于基肥氮。
英文摘要：
Ammonium and nitrate nitrogen in base fertilizer and topdressing nitrogen were marked by ^15N to study nitrogen absorption and distribution in flue-cured tobacco in Henan province. Results showed that： （1）Nitrogen accumulation in tobacco plant increased in the whole growing stage especially in vigorous growth period. Soil nitrogen accumulation was significantly greater than that of fertilizer nitrogen and more than 50% of nitrogen absorbed was accumulated in leaves. Nitrogen accumulation in root showed sustained increasing trend. （2） The ratio of fertilizer nitrogen to total nitrogen reduced with growth period extending and the ratio of fertilizer nitrogen to total nitrogen in leaves of different parts was in the order of lower leaves〉 middle leaves〉 upper leaves. （3）Nitrogen accumulation ability of tobacco plant was strongest 40 to 60 days after transplanting and decreased thereafter gradually. The loss of fertilizer nitrogen in tobacco plant appeared in late growth period when tobacco plant could still absorb nitrogen from soil. Nitrate nitrogen was easier to be absorbed than ammonium nitrogen in base fertilizer. Top dressing nitrogen was easier to be absorbed.
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