黑龙江烤烟不同部位叶片锰锌铜含量的变化

Variation of Manganese, Zinc, and Copper Contents in Different Leaf Position of Flue-cured Tobacco in Heilongjiang

摘要: 对烤烟下、中、上3个部位叶片中锰、锌、铜含量的变化进行了研究。结果表明，随着烟叶部位的上升和采收日期的延迟，烟叶中锰含量随之降低，而锌和铜含量逐渐上升。3个烟叶部位之间锌含量差异极显著，锰和铜含量差异不显著；不同采收日期之间锰和锌含量差异极显著，而铜含量差异不显著；采收日期与烟叶锰元素含量呈显著负相关，烟叶中锰与锌、铜含量之间呈极显著负相关，锌与铜含量之间呈极显著正相关。

Abstract: The changes of manganese (Mn), zinc (Zn), and copper (Cu) contents in different-position leaves of flue-cured tobacco were studied. The results indicated that Mn contents decreased, Zn and Cu contents increased with the increasing leaf positions and the delaying harvesting dates. The Zn content difference was extremely significant and the Mn and Cu content difference was not significant among different positions. The difference of Mn and Zn contents was extremely significant and Cu content difference was not significant among different leaf harvesting dates. Leaf harvesting dates were negatively correlated to Mn contents. The extremely significant positive correlations were observed between Zn and Cu, and extremely significant negative correlations were observed between Mn and Zn and between Mn and Cu.