三七(Panax notoginseng)对不同光照强度的生理生态适应性研究

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为探讨三七(Panax notoginseng)对不同光照强度的生理生态适应机制,本研究以二年生三七为材料,研究其在不同光照强度下的生长特性、叶片解剖结构、生物量积累与分配以及光合生理特性.结果表明:处理120d后,透光率为5.10%荫棚下三七株高、叶面积、茎粗均显著高于其他遮阴处理(P<0.05).随着光强降低,三七叶片厚度、栅栏组织厚度、海绵组织厚度、根生物量比、气孔导度、蒸腾速率均随之减小,而其叶生物量比、茎生物量比及水分利用速率却随之增大.透光率为46.5% ~5.10%荫棚下,随着透光率的减小,
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