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   Hedera helix (藤本植物,攀援植物) English   
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    据迪德里奇和斯威林(2000),螺旋长春藤(Hedera helix)是一个入侵性植物,会入侵威胁森林中所有的植层和开放区,生长在地面,也会进入森林树冠。螺旋长春藤(Hedera helix)的影响包括原生植被的减少和生物多样性的丧失。茎上长出像小雨伞般的浓密丰富的叶片,形成厚厚的树冠,阻碍阳光到达地面上的其它植物。

    此藤蔓会爬上树干蔓延,包围和覆盖树枝,树叶会阻碍大部分的阳光到达宿主植物因而降低光合作用。它会盖住分生组织,因而破坏了树木的生长,先盖住枝梢,最终把树的顶部也盖住。对光合作用和生长的影响可能同时也对根系造成损害,因为树木可能无法提供营养给根(David L. Morgan in Aliens-L January 28 2005)。寄主树明显地会在几年之内丧失活力,然后死亡。增加的藤蔓重量,使被侵袭的树木更容易在风暴期间被吹倒。

    Garry Oak Ecosystems (Canada) (Canada) English 
    伤害宿主: H. helix may create a dense cover on the bark of trees, depriving the bark of normal contact with air and micro-organisms. The weight of the vine and leaves, together with moisture from rain and snowfalls, makes the tree top-heavy and prone to damage or blowdown during windstorms. Heavy ivy cover may eventually reduce the tree’s foliage and its capacity to photosynthesise, weakening or even killing the tree.

    栖地改变: The dense growth habit of H. helix and abundant leaves can block sunlight from low-growing native plants, crowding them out and preventing germination of their seeds. H. helix may eventually dominate excluding most plants on the forest floor, and altering or eliminating habitat and food sources for many birds, mammals, butterflies, and other wildlife.

ISSG Landcare Research NBII IUCN University of Auckland