不同红蓝LED光照强度和灌溉量交互作用对番茄幼苗生长的影响

以红蓝LED光为基本光源,研究了光照强度和灌溉量互作对千禧番茄幼苗生长发育和光及地上合作用等的影响。结果表明:不同光照强度和灌溉量对番茄幼苗生长的影响差异显著。随着灌溉量的减少,番茄幼苗株高降低、茎粗变小、节间缩短、叶面积减少,植株鲜样质量和地上部干质量的生物量分配逐渐降低,光合作用降低。试验发现,影响叶绿素含量的主要因子为光照条件,水分表现为次要影响因子。相同灌溉量下,当光照强度超过3 540 lx后,光照增强对植株的生物量没有显著影响。试验中所有处理组合的最大光化学效率F_v/F_m均稳定在0.8左右,表明植株生长均处于健康状态。在各处理中,以3 540 lx的光照强度和150 mL·株^-1的灌溉量(L₂W₁)处理植株生长状况最好。

Effects of different red and blue LED light intensity and irrigation and their interactions on growth of tomato seedlings

In this study, the growth and photosynthesis of tomato seedlings under different light intensity and irrigation were investigated by using red and blue light as the basic light source. The results showed that different light intensity and irrigation had significant effects on the growth of tomato seedlings. Plant height was decreased,stem diameter became smaller, internode was shortened, leaf area was decreased, fresh weight of the plant and dry weight of the shoot was decreased, and photosynthesis of tomato seedlings was decreased with the reduction of irrigation. The main factors affecting chlorophyll content were light conditions, and water was a secondary influence factor. When the light intensity exceeded 3 540 lx, the increase of light intensity had no significant effect on biomass of the plant. The maximal photochemical efficiency F_v/F_m of all treatment combinations in the experiment were stable at around 0.8, indicating that plant growth was in a healthy state. Among all the treatment, tomato plants with 3 540 lx light density and 150 mL·plant^-1 irrigation (L₂W₁) presented the most strong growth vigor.