作　　者： ; ;

机构地区： 韩山师范学院生物系

出　　处： 《生态学报》 2009年第5期2701-2709,共9页

摘　　要： 马缨丹(Lantana camara L.)是粤东地区的入侵植物之一。采用LI-6400光合作用仪对马缨丹及其常见主要伴生种鬼针草(Bidens pilosa L.)、肖梵天花(Urena lobata L.)、土牛膝(Achyranthes aspera L.)在不同有效光合辐射(PAR)和不同CO2浓度下的光合生理指标进行测定,结果表明:(1)马缨丹的光饱和点(LSP)与光补偿点(LCP)分别为1225、13.58μmo.lm-.2s-1,均低于伴生种,且和伴生种差异达到显著水平,光饱和点时的最大净光合速率(Pmax)为13.89μmol.m-2.s-1,表观量子效率(AQY)为0.0503μmol.m-.2s-1,与土牛膝相当,而显著高于肖梵天花;(2)马缨丹的CO2饱和点(CSP)与CO2补偿点(CCP)分别为1350、61.78μmol.mol-1,CO2饱和点时马缨丹的最大净光合速率(Pmax)为20.08μmo.lmol-1,显著高于土牛膝,马缨丹的表观羧化效率(CE)与鬼针草相当,为0.0424μmo.lmol-1;(3)有效光合辐射与CO2浓度的增加,对马缨丹气孔导度(Gs)、蒸腾速率(Tr)影响不明显,但大大提高了其水分利用率(WUE),提示马缨丹对于环境中光强和CO2的变化具有良好的适应能力。这些信息对马缨丹生理生态学特性的认识是一个补充,并能为马缨丹入侵机制的研究提供一些有价值的参考。 Ecophysiological properties, such as photosynthetic characteristics, many invasive plant species. Using a field photosynthesis measurement system the photosynthetic characteristics of a common invasive plant in eastern Guangd contribute significantly to the success of （LI-6400）, we determined and compared ong Province, China, Lantana camara L. and three species often associated with it, Bidens pilosa L. , Urena lobata L. and Achyranthes aspera L. , Our results showed that： （1） Light saturation point and light compensation point of L. camara were 1225 μmol·m^-2·s^-1 and 13.58 μmol·m^-2·s^-1, respectively, which were significantly lower than those of all three associated species （p 〈 0.05 ）, AQY of L. camara was equivalent to A. aspera and higher than U. lobat. （2） CO2 saturation point and CO2 compensation point （CCP） of L. camara were also lower than that ofA. aspera, but higher than those of the other two species. However, Pmax （20.08 μmol·mol^-1） of L. camara at CSP was much higher than A. aspera under study, and CE of L. camara was equivalent to B. pilosa and higher than A. aspera. （3） Increased photosynthetically active radiation and CO2 concentration did not significantly affect either stomatal conductance or transpiration rates, but greatly improved the water use efficiency （WUE） of L. camara. These data indicate that the ecophysiological advantages of L. camara could contribute to its success as an invasive species.

关 键 词： 马缨丹 光合生理特性 净光合速率 表观量子效率 表观羧化效率

领　　域： [生物学] [生物学] [生物学]