摘要:
通过不同光强(15%、40%和70%自然光强)和施氮量(15、 30和60 g/株)的盆栽试验,研究了不同光照强度和施氮量对催吐萝芙木(Rauvolfia vomitoria Afzel.)叶片生长和光合特性的影响.结果表明:光强和施氮量显著影响了催吐萝芙木叶片净光合速率(Pn)、气孔导度(Gs)、水分利用效率(WUE)、叶绿素含量(Chl)、比叶面积(SLA)和叶生物量比(LMR)(p<0.01),Pn和Gs均随光强、施氮量的增加而增大,70%自然光强下叶片Pn和Gs显著高于15%和40%自然光强处理.总体而言,低光条件下,更有利于其叶绿素的合成,且施氮量对叶绿素含量的影响不大.低光处理和重度施氮量均有利于催吐萝芙木叶片SLA增大和叶生物量的分配,但实验中光强和施氮量处理并未引起催吐萝芙木叶绿素荧光参数Fv/Fm发生显著变化.光强和施氮量对催吐萝芙木叶片净光合速率(Pn)、气孔导度(Gs)、水分利用效率(WUE)等光合生理指标具有显著的交互作用(p<0.05).
Abstract:
A pot culture experiment was conducted to study leaf growth and photosynthetic characteristics of Rauvolfia vomitoria plants under different light intensities (15%,40%,and 70% of full sunlight) and nitrogen levels (15,30,and 60 g/per plant).Results showed that the net photosynthesis rate (Pn),stomatal conductance (Gs),water utilization efficiency (WUE),chlorophyll contents (Chl),specific leaf area (SLA),and leaf mass ratio (LMR) were significantly influenced by light intensity and nitrogen level (p<0.01). The Pn and Gsincreased with the increase in light intensity and nitrogen level.In addition,the values of Pn and Gs under 70% light intensity were much higher than those under 15% and 40% light intensity.Conclusively,low light intensity is more beneficial to the synthesis of chlorophyll.The combination of low light and high nitrogen level favored SLA and leaf biomass allocation.As for the fluorescence parameter, Fv/Fm did not differ significantly according to light intensity and nitrogen level.Light intensity and nitrogen levels also had significant interaction on the Pn,Gs,and WUE (p<0.05).
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