高海拔地区光强减弱对烤烟生长发育和产量的影响

为探讨高海拔条件下光强减弱对烤烟生长发育、产量及产量构成的影响,采用裂区设计开展大田试验,并用方差分析和多重比较的方法分析光强减弱对烤烟生长及烟叶产质量的影响。结果表明,光强减弱后烤烟生育进程推迟,烤烟叶长、叶宽和叶面积指数增加,株高和节间距增加,茎粗降低,根颈部直径、最大侧根直径降低,直径≥2 mm侧根数减少;随着光强减弱,各器官干物质积累均减少,干物质在经济器官中的分配比例下降;随着光强减弱,烟叶总产量下降,中上等烟比例下降。光强减弱对烟株生长、产量及产量构成都有显著影响。

Effects of Shading on the Growth,Development and Yield of Tobacco in High-altitude Areas

To investigate the effect of weekening light intensity on the growth and development,yield and yield structure of flue-cured tobacco under the condition of high altitude.A field experiment was carried out to investigate the effects of shading on the growth,development,yield and composition of yield of tobacco.The re-sults indicated that under shading,the growing progress of tobacco plants delayed,the length and width of to-bacco leaves increased,the plant height increased,the diameter of stem and lateral root decreased,the number of lateral roots with a diameter in excess of 2 mm also decreased.With the light intensity weakening,the accu-mulation of dry matter decreased,the distribution proportion of dry matter in tobacco leaf descended;with the light intensity weakening,the yield of tobacco leaves and proportion of middle and choice leaves descended.The effect of weakening light intensity on the growth,yield and yield composition of tobacco plant was significant.