遮荫对闽楠幼苗光合及其叶片解剖特性的影响
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引用本文:薛 黎,李志辉,童方平,王佩兰.遮荫对闽楠幼苗光合及其叶片解剖特性的影响[J].西北植物学报,2019,39(7):1221~1229
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作者单位
薛 黎1,李志辉1*,童方平2,王佩兰1 (1 中南林业科技大学 林学院长沙 4100042 湖南省林业科学院长沙 410004) 
基金项目:湖南省重点研发项目(2017NK2221);
中文摘要:以2年生闽楠幼苗为材料,探讨不同遮荫处理[0(CK,全光照) 和30%、50%、70%遮荫]对闽楠[Phoebe bournei (Hemsl.) Yang]幼苗光合作用及其叶片解剖结构的影响,为闽楠的合理栽培及人工林混交树种的配置提供理论依据。结果表明:(1)与全光照处理(CK)相比,闽楠幼苗叶片净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、最大净光合速率(Pnmax) 、光饱和点(LSP)、光补偿点(LCP)及暗呼吸速率(Rd)均随遮荫强度的增加而显著下降;在30%和50%遮荫下,幼苗能通过提高水分利用效率(WUE)和表观量子效率(AQY),增加叶绿素含量来充分利用弱光环境;70%遮荫处理则影响闽楠幼苗的正常生长。(2)遮荫降低了闽楠幼苗叶片的气孔密度,但单个气孔器的面积显著增加;遮荫处理下,闽楠叶片和主脉明显变薄;栅栏组织和海绵组织厚度降低,排列稀疏,栅海比减小,有利于提高对光能的利用效率。(3)闽楠幼苗根、茎、叶及总生物量均在全光照下最大,遮荫抑制了植株生物量的积累。研究发现,闽楠幼苗在遮荫处理下生物量积累和光合效率降低,但同时在叶片解剖结构和功能上表现出对遮荫的适应性,从而表现出一定的耐荫性。
中文关键词:闽楠  遮荫  光合特性  解剖结构
 
Effect of Shading on Photosynthetic Characteristics and Anatomical Structure in Leaves of Phoebe bournei Seedlings
Abstract:The effects of shading treatments [0(CK, full light), 30%, 50% and 70% shading] on photosynthesis and anatomical structure in leaves of 2 year old Phoebe bournei seedlings. It provides a theoretical basis for the rational cultivation and the tree species arrangement in plantations of P. bournei. The results showed that: (1) the net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs), maximum net photosynthetic rate (Pnmax), light saturation point (LSP), light compensation point (LCP) and dark respiration rate (Rd) of seedlings significant decreased in shading intensity compared to that under full light; Under 30% and 50% shading, the seedlings could fully utilize low light environment by increasing chlorophyll content, water use efficiency (WUE) and apparent quantum yield (AQY). The seedlings could not grow well under 70% shading treatment. (2) Under shading, the stomatal density of the leaves decreased. However, the area of stomata apparatus were significantly influenced. Under shading, the leaf and main vein thickness decreased. The thickness and the ratio of the palisade tissue and the sponge tissue were reduced and the arrangement of the palisade tissue becomes loose which is beneficial to improve the utilization efficiency of the light energy. (3) The biomass of root, stem, leaf and total biomass were the largest under full light that means shading inhibited the biomass accumulation of seedlings. It was found that the seedlings of P. bournei showed a decrease in biomass accumulation and photosynthetic efficiency under shading treatment, but at the same time, it showed adaptability to shading in the leaves anatomical structure and function, thus showing a certain tolerance to negative.
keywords:Phoebe bournei  shading  photosynthetic characteristics  anatomical structure
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