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为研究紫外辐射对丽江特色优质烟叶形成的影响,采用盆栽试验,用100%(对照),7.6%,62.2%,51.4%4种不同紫外辐射透过率的透明薄膜进行遮盖,研究其对烤烟生长及品质的影响。结果表明:(1)进行紫外辐射滤减后,烤烟农艺性状与对照差异不明显。(2)对照比各处理在烤烟生长的前期合成更多的光合色素,但从旺长后期开始其降解速度加快;随着紫外辐射增强,光合速率下降,各处理较对照分别下降2,2.4,4.1μmol/(m~2·s)。(3)随着紫外辐射强度的降低,烟叶栅栏组织厚度和叶片厚度减小,各处理分别减少6.72,10.04,8.84μm和23.46,28.98,22.98μm。对照与处理之间差异极显著,但处理之间差异不明显。(4)一定范围内紫外辐射的增强能促进烟叶糖类化合物的合成,不利于含氮化合物的积累,对钾和氯含量无明显影响。随着紫外辐射的滤减,上部叶、中部叶、下部叶总糖分别减少2.75%～6.68%,3.37%～6.13%,0.98%～1.66%;上部叶、中部叶、下部叶还原糖分别减少0.42%～2.47%,0.63%～4.22%,3.40%～5.68%;上部叶、中部叶总氮分别增加0.21%～0.71%,0.05%～0.39%,下部叶减少0.07%～0.25%;上部叶、中部叶、下部叶烟碱分别增加0.14%～1.22%,0.05%～0.87%,0.34%～0.82%。
In order to study the effect of ultraviolet radiation on the formation of high quality tobacco leaves of Lijiang, pot experiments were conducted to study the effect of UV radiation on the formation of tobacco with high quality. Effects of growth and quality. The results showed that: (1) There was no significant difference in agronomic characters between flue-cured tobacco and control after UV radiation filtration. (2) The control synthesized more photosynthetic pigments than the other treatments at the early stage of flue-cured tobacco growth. However, the photosynthetic rate of the photosynthetic pigments increased from the late growth stage of the flue-cured tobacco. With the enhancement of ultraviolet radiation, the photosynthetic rate decreased and the photosynthetic rate decreased by 2,2.4, 4.1μmol / (m ~ 2 · s). (3) With the reduction of ultraviolet radiation intensity, the thickness of palisade tissue and leaf thickness decreased, the treatments decreased by 6.72,10.04,8.84μm and 23.46,28.98,22.98μm respectively. The difference between control and treatment was very significant, but the difference between treatments was not obvious. (4) A certain range of enhanced UV radiation can promote the synthesis of tobacco sugars, is not conducive to the accumulation of nitrogen compounds, potassium and chlorine content had no significant impact. With the reduction of ultraviolet radiation, the total sugar in upper leaf, middle leaf and lower leaf decreased by 2.75% ~ 6.68%, 3.37% ~ 6.13% and 0.98% ~ 1.66%, respectively; the reduced sugar in upper leaf, middle leaf and lower leaf decreased 0.42% -2.47%, 0.63% -4.22% and 3.40% -5.68% respectively. The total nitrogen in upper and middle leaves increased by 0.21% -0.71%, 0.05% -0.39% and 0.07% -0.25% , Middle leaf, lower leaf nicotine increased by 0.14% ~ 1.22%, 0.05% ~ 0.87%, 0.34% ~ 0.82%.