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为探讨伯乐树Bretschneidera sinensis幼苗的适宜光强环境,并为伯乐树幼苗的人工繁育及种群复壮提供参考,达到保护这一濒危物种的目的,比较研究了不同光强下(1 450.00,550.00和200.00μmol·m-2·s-1)伯乐树幼苗的光合日变化、光响应曲线、二氧化碳响应曲线以及形态指标等相关参数。结果表明:气孔导度、蒸腾速率和光合速率的日变化均以全光处理下的较高;光强相对较高环境下(1 450.00和550.00μmol·m-2·s-1)伯乐树幼苗叶片的表观光合速率、最大光合速率、最大羧化速率和羧化效率等光合参数值均显著较高(P<0.05),幼苗表现出良好的生长态势,说明伯乐树幼苗喜光。同时,不同光强处理下伯乐树幼苗叶片的光补偿点分别为21.22,19.93和14.95μmol·m-2·s-1,其值均较低,说明伯乐树幼苗也较耐弱光。较高光强有利于伯乐树的光合作用,植株长势健壮,株高和地径相对较大。建议在进行伯乐树幼苗人工繁育时,不宜过度遮荫光;在原生地抚育时,应适当增加林窗的光照强度。
In order to explore the suitable light intensity environment of Bretschneidera sinensis seedlings and to provide references for artificial breeding and population rejuvenation of Bolete seedlings, the purpose of protecting this endangered species was studied. The effects of different light intensities (1 450.00, 550.00 and 200.00 μmol · m-2 · s-1) photosynthetic diurnal variation, light response curve, carbon dioxide response curve and morphological parameters of Bole. The results showed that the diurnal changes of stomatal conductance, transpiration rate and photosynthetic rate were higher under all-light treatment. Under the relatively high light intensity (1 450.00 and 550.00 μmol · m-2 · s-1) The photosynthetic parameters such as apparent photosynthetic rate, maximum photosynthetic rate, maximum carboxylation rate and carboxylation efficiency of leaves were significantly higher (P <0.05), and the seedlings showed a good growth trend, indicating that the seedlings of Bole. At the same time, the light compensation points under the different light intensity treatments were 21.22, 19.93 and 14.95μmol · m-2 · s-1, respectively, indicating that the light compensation points of Bole was more resistant to weak light. The higher light intensity is conducive to the photosynthesis of Bole, plants grow robust, relatively large plant height and diameter. It is not advisable to over-shade the leaves when artificial breeding of Bole-tree seedlings. It is advisable to increase the light intensity of gaps in the forest-window when cultivating natively.