不同光照及采食条件对薇甘菊和鸡屎藤叶片形态可塑性的影响

Effects of Different Light and Herbivory Conditions on Leaf Morphological Plasticity of Mikania micrantha and Paederia scandens

为探讨薇甘菊在生物控制的情况下对不同光照环境的入侵能力,本研究比较了不同光照强度(相对光强100%,14.72%)和模拟采食(每片叶片剪掉50%的叶面积,不剪叶)条件下薇甘菊叶片形态可塑性的变化,并将其与本地形态相似的藤本植物鸡屎藤进行对比。结果表明:遮阴显著增加了薇甘菊和鸡屎藤的叶面积,而模拟采食降低了薇甘菊的叶片面积和重量,却没有降低鸡屎藤的叶片面积和重量。遮阴显著增加了薇甘菊和鸡屎藤的比叶面积,增幅达近一倍,说明薇甘菊和鸡屎藤对光照条件的变化都有较强的可塑性反应。模拟采食并没有降低薇甘菊和鸡屎藤的这种表型可塑性的表达。本研究表明,尽管引入天敌可降低薇甘菊的生长,但薇甘菊仍可能通过调节自身的叶片形态特征来维持其对不同光照环境的入侵能力。

To explore the i nvasi on potential of Mikania micrantha that is under biological control into environments with different levels of light availability,this study examined the effects of light availability（100% and 14.72% of full sunlight） and simulated herbivory（50% leaf area removal and no leaf area removal） on the leaf morphological plastic changes in M.micrantha and a comparative native species Paederia scandens.The results showed that shading significantly increased the leaf area of M.micrantha and P.scanden,and simulated herbivory decreased the leaf area and weight of M.micrantha but not those of P.scanden.Shading nearly doubled the specific leaf area of M.micrantha and P.scanden,indicating that M.micrantha and P.scanden are all plastic in response to light availability.Simulated herbivory did not reduce the expression of this plasticity.This study suggests that although natural enemy introduction could reduce the growth of M.micrantha,M.micrantha may remain its invasion potential into environments with diverse light levels through adjusting its leaf morphological traits.