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为探讨井窖式移栽烟苗生长发育过程中的光合生理变化,结合田间和盆栽试验,对比研究了常规膜上和井窖式2种移栽模式下烟苗生长环境的太阳光合有效辐射(PAR)水平和生长发育水平,进一步分析了烟苗叶片光合作用和光系统Ⅱ(PSⅡ)最大光化学效率(Fv/Fm)特征。结果表明:与常规膜上移栽比较,井窖内太阳光合有效辐射水平降低,其中,井窖内距井窖口4和8cm处PAR分别为常规移栽的72.60%和52.85%;井窖式移栽提高了烟苗株高、增大了烟叶最大叶长和叶宽,但降低了叶片叶绿素含量;井窖式移栽降低了叶片最大净光合速率(Pmax)和光饱和点(LSP),但表观量子效率(AQY)提高了4.44%,光补偿点(LCP)和暗呼吸速率(Rd)分别减小了20.43%和17.78%,增强了烟苗对井窖内弱光的适应能力;井窖式和常规膜上移栽均降低了PSⅡ的最大光化学效率(Fv/Fm),但井窖式移栽烟苗Fv/Fm显著(P<0.05)高于常规膜上移栽,增幅5%~9%。采用井窖式移栽,烟苗对井窖内弱光环境的自我适应和光能利用能力增强,生长发育加快。
In order to explore the photosynthetic changes during the growth and development of cellar transplanting tobacco seedlings, the photosynthetic and physiological changes in the growth and development of cellar transplanting seedlings were studied. PAR) and the level of growth and development. The photosynthesis and the maximum photochemical efficiency (Fv / Fm) of photosystem Ⅱ were also analyzed. The results showed that compared with the conventional transplanting, the photosynthetically active radiation level in the well cellar decreased. Among them, the PARs at the 4 and 8 cm wells in well cellar were 72.60% and 52.85% of the conventional transplants, respectively; Transplantation increased plant height and increased maximum leaf length and leaf width, but decreased leaf chlorophyll content. In cellar transplanting, maximum leaf photosynthetic rate (Pmax) and light saturation point (LSP) were reduced, Apparent quantum yield (AQY) increased by 4.44%, light compensation point (LCP) and dark respiration rate (Rd) decreased by 20.43% and 17.78%, respectively, which enhanced the adaptability of tobacco seedlings to weak light in wells. The maximum photochemical efficiency (Fv / Fm) of PSⅡ was reduced by both pit and conventional membrane transplanting, but the Fv / Fm of well-celled transplanting tobacco seedlings was significantly (P <0.05) higher than that of conventional membrane transplanting with an increase of 5% ~ 9%. The use of cellar transplanting, tobacco seedlings on the well-cellar environment of weak light self-adaptation and ability to use light to enhance and accelerate the growth and development.