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作 者 ：郑宪滨1;曹一平1;张福锁1;朱尊权2;李春俭1;刘国顺3;谢德平4

期 刊 ：植物营养与肥料学报 2000年 6卷 2期 页码：166-172

关键词：烤烟；钾；循环；累积；分配；

Keywords:flue-cured tobacco, potassium, circulation, accumulation, distribution,

摘 要 ：在营养液培养条件下 ,利用Jeschke等人建立的模型 ,定量研究了不同供钾水平下烤烟体内钾的循环、累积和分配。结果表明 ,供钾水平对烤烟干物重影响不显著 ;供钾水平提高能显著提高烤烟叶片以及根和茎的含钾量 ,增加烤烟体内钾素累积。不同供钾水平下的烤烟 ,在打顶后 10天内 ,体内都有大量钾离子沿韧皮部由地上部回流到根中 ,回流到根中的钾量占由根运输到地上部的钾量的比例大约在 50 %以上。供钾水平低时 ,该比例明显降低 ,供钾水平提高 ,钾循环量增加。不同供钾水平下 ,烤烟体内钾分配比例都是叶片最高 ,根和茎较低 ;打顶后 10天内烤烟叶片中钾分配减少 ,根中钾分配增加

Abstract:The solution culture experiment was carried out to study the effect of potassium supply levels on circulation, accumulation and distribution of potassium in flue-cured tobacco. The results showed that there were large amounts of potassium flowing from shoot back to root in flue-cured tobacco. The flowing amount of potassium in phloem was more than about 50% of the amount in xylem. The potassium circling amount between root and shoot increased as potassium supply levels increased. The difference of dry weight of flue-cured tobacco among potassium supply levels was not significant. The potassium contents of leaf, stem and root of flue-cured tobacco increased significantly as the potassium supply levels increased. The leaf potassium content could be quite high if there were large amounts of potassium ion supplied. The highest K₂O content of leaf in this experiment was 8.8%. The potassium distribution proportion in organs of flue-cured tobacco was highest in leaf, lower in stem and root under different potassium supply levels. After topping, potassium distribution proportion decreased in leaf and increased in root.

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