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为探明重建生态系统中重新补种植物对冬季低温条件的适应性,以福建长汀亚热带花岗岩红壤侵蚀区的造林树种马尾松(Pinus massoniana)、木荷(Schima superba)、樟树(Cinnamomum camphora)与深山含笑(Michelia maudiae)为研究对象,应用叶片气体交换和叶绿素荧光分析技术,对4种植物进行研究,探讨霜冻低温对4种造林树种光合生理的影响,以及霜冻时4种造林树种的自我保护机制.结果表明:霜冻使植物叶片PSⅡ最大量子效率(Fv/Fm)下降,最小荧光(Fo)上升;霜冻发生当天植物保持较高的NPQ值和较低的Yield值;霜冻后,随温度的上升,NPQ值逐渐减小,Yield值逐渐增大;4种树种霜冻当天的最大净光合速率(Pn,max)均小于霜冻后.霜冻时,4种造林树种均能通过加强非光化学猝灭增加热耗散来消除因光化学效率降低所累积的过量光能,以达到自我保护的目的.不同树种对霜冻的适应性不同,表现为马尾松适应性最强,樟树次之,深山含笑和木荷较差.
In order to find out the adaptability of replanting plants in rebuilding ecosystems to winter low temperature conditions, Pinus massoniana, Schima superba, Cinnamomum camphora, And Michelia maudiae were studied in this paper. Leaf gas exchange and chlorophyll fluorescence were used to study the effects of frost on the photosynthetic physiology of four afforestation species and their self (Fv / Fm) decreased, and the minimum fluorescence (Fo) increased. On the day of frost, plant maintained high NPQ value and low yield value. After frost, with the increase of temperature (Pn, max) were lower than that of the frost on the day after frost, and all of the four afforestation species could enhance the non-photochemical quenching Increase the heat dissipation to eliminate the excess light energy accumulated due to the decrease of photochemical efficiency in order to achieve the purpose of self-protection.Furthermore, the adaptability of different tree species to frost is different, The strongest, followed by camphor, and poor maudiae superba.