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作 者 ：张中峰;黄玉清;莫凌;尤业明;焦继飞;

期 刊 ：武汉植物学研究 2009年 27卷 3期 页码：340-344

关键词：岩溶区；非直角双曲线模型；光响应曲线；表观量子效率；

Keywords:Karst area, Non-rectangular hyperbolic model, Photosynthesis-light response curve, Apparent quantum yield,

摘 要 ：用直角双曲线和非直角双曲线两种模型,对桂林岩溶区石山植物红背山麻杆(Alchornea trewioides)、九龙藤(Bauhinia championii)、青檀(Pteroceltis tatarinowii)和圆叶乌桕(Sapium rotundifoliumi)光合作用的光响应曲线进行拟合.结果表明,直角双曲线拟合的表观量子效率(α)、最大净光合速率(P_max)、暗呼吸速率(R_d)、光补偿点(L_cp)和光饱和点(L_sp)数值均高于相应的非直角双曲线拟合结果;直角双曲线模型拟合的参数值大小和曲线变化趋势不符合实际情况;非直角双曲线模型拟合结果更符合生理意义.红背山麻杆和九龙藤具有较高的表观量子效率和较低的光补偿点,对光能的利用效率和耐荫性均强于圆叶乌桕和青檀.

Abstract:The photosynthesis-light response curves of limestone plants Alchornea trewioides,Bauhinia championii,Pteroceltis tatarinowii,Sapium rotundifoliumi in Guilin karst area were fitted with rectangular hyperbolic and non-rectangular hyperbolic models.The results showed that the values of apparent quantum yield(α),the maximal net photosynthetic rate(P_max),dark respiration rate(R_d),light compensation point(L_cp),and light saturation point(L_sp) of the four tree species were higher when fitted with rectangular hyperbolic model than with non-rectangular hyperbolic model.The values and light curves which fitted by rectangular hyperbolic model could not reflect the actual situation,while non-rectangular hyperbolic model were more reasonable because its fitted results better matched physiological meanings.A.trewioides and B.championii had higher apparent quantum yields and lower light compensation,their light use efficiency was higher and shade tolerance was better than S.rotundifolium and P.tatarinowii.

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