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作 者 ：许凯扬;叶万辉;李国民;李静

期 刊 ：武汉植物学研究 2005年 23卷 6期 页码：560-563

关键词：喜旱莲子草；表型可塑性；光照强度；入侵；

Keywords:Alternanthera philoxeroides, Phenotypic plasticity, Light intensity, Invasion,

摘 要 ：对外来入侵种喜旱莲子草[Alternanthera philoxeroides(Mart.)Griseb.]在不同强度光照处理中的表型可塑性反应进行了研究。结果表明:在高光照(100%)、中等光照(60.4%)、低光照(35.4%)和弱光照(16.5%)条件下,随光照强度的降低,分枝强度、基株株长、茎节长度随之下降,总生物量及根、茎、叶生物量显著减少;中等光强度处理喜旱莲子草根冠比显著低于其他处理;弱光条件下喜旱莲子草生长迟缓,呈直立状。研究结果表明,光照强度是影响喜旱莲子草种群生存与维持、生长和成功入侵、扩散的重要因子,同时也说明光照强度较低的生态系统喜旱莲子草入侵成功的机会很小。

Abstract:The phenotypic plasticity in response to different light intensity in the invasive species Alternanthera philoxeroides was studied.The results showed: from full light(100%),60.4%,35.4% to 16.5% full light,branching intensity of A.philoxeroides decreased significantly.Inter-node length and plant total length were the longest under full light and the shortest under low light level.With the decrement of light intensity,the accumulation of total biomass and individual organs’ biomass of A.philoxeroides decreased significantly,and the allocation of individual organs’ biomass differed significantly.The results indicated that light intensity might be the major factor,which affected the survival,maintainability,growth and successful invasion significantly.A.philoxeroides could not extend the population under low light intensity level,which means fewer opportunity of successful invasion into these types of ecosystems.

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