薇甘菊在不同光环境下的生理生态研究

为了探讨薇甘菊在不同光环境下（相对光强100％，25％，10％）的生理生态研究，系统研究了不同遮荫生长下的薇甘菊叶片平均净光合速率（Pn）、叶绿素荧光参数、光合色素含量、叶面积和比叶重（SLW）。结果表明：100％相对光强下薇甘菊在12 : 00~14 : 00时表现出短暂的光抑制现象；在高光强下薇甘菊显著提高净光合速率（Pn）、比叶重（SLW）、叶绿素a、叶绿素b、类胡萝卜素含量、类胡萝卜素/叶绿素比值来维持其正常生长和避免午间高光强对光合系统的破坏；25％和10％ 2个光环境下生长的薇甘菊各测定指标无显著差异，其通过提高叶面积捕捉更多的光能以维持自身的生长。喜光植物薇甘菊能够在不同光环境下正常生长，推测薇甘菊生理和形态在不同光环境下，光系统调节作用和表型可塑性是其较强入侵性的原因之一。

Ecophysiology of Mikania micrantha H.B.K under Different Light Conditions

To explore the ecophysiology of Mikania micrantha growing under different relative irradiance(RI 100%, 25%, 10%), net photosynthetic rate(Pn), chlorophyll fluorescence parameters, chlorophyll content, specific leaf weight(SLW)and leaf areas were measured in this paper. The results were shown as follows. Photoinhibition of Mikania micrantha occurred slightly during 12:00~14:00 under 100% RI; M. micrantha increased Pn, SLW, chlorophyll a, chlorophyll b, carotenoid and Car/Chl to sustain high relative growth rate and protect photosynthetic institutions from being injured. The measured variables were not significant under RI 25% and 10%, and leaf areas increased to increase light absorption for photosynthetic capacity and growth. M. micrantha could grow and reproduce in a wide range of light conditions, and phenotypic plasticity in physiological and leaf morphological traits might be the reasons that made Mikania micrantha a vigorous invader in different habitats.