水热耦合效应对烟叶中烟碱含量的影响

The effect of hydro-thermal coupling on the content of nicotine in tobacco leaves

通过室内模拟试验,研究了水分和温度以及水热耦合对烟叶中烟碱含量的影响。结果表明,烟叶中烟碱含量受土壤含水率的影响,在各供试温度下,当土壤含水率为14%～18%时,不同生长期烟叶烟碱含量均随土壤含水率的增加而增加;土壤含水率为20%～25%时,则随之增加而减少;土壤淹水不利于烟碱的合成积累。土壤温度对烟叶中烟碱含量的影响程度大于水分,增温有利于烟碱的合成积累,当温度在15～30℃时,烟碱含量随温度升高而增加。水热耦合对烟叶烟碱含量的影响呈正交互效应,在适宜烟碱合成积累的水热条件下,水热耦合有利于提高烟碱含量;在不利于烟碱合成积累的条件下,水热仍可通过互补耦合提高烟叶烟碱含量。

The influence of soil hydro-thermal levels on the content of nicotine in tobacco leaves was studied under the simulated indoor experiment.The results are as follows.Different soil moisture contents have different influences on the nicotine content in tobacco leaves.Under the temperatures tested,the content of nicotine in tobacco leaves increases with the increase of soil water in the range of 14%-18% during different growth stages after seedling transplant;The content of nicotine,however,decreases with the increase of soil water in the range of 20%-25%;Soil submersion has negative effect on the synthesis and accumulation of nicotine content in tobacco leaves.Soil temperature has greater impact than soil water.In the range of 15-30 ℃,the increase of soil temperature is favorable to the synthesis and accumulation of tobacco content.Hydro-thermal coupling has positive interactive effect on the synthesis and accumulation of nicotine content in tobacco leaves.The coupling is advantageous to the accumulation of nicotine content when the hydro-thermal conditions are favorable,whereas under unfavorable hydro-thermal conditions,the coupling can also increase the nicotine content through complementary interaction.