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首页> 美国卫生研究院文献>Ecology and Evolution >More widespread alien tree species do not have larger impacts on regeneration of native tree species in a tropical forest reserve
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More widespread alien tree species do not have larger impacts on regeneration of native tree species in a tropical forest reserve

机译：在热带森林保护区中分布较广的外来树种不会对原生树种的再生产生较大影响

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There is insufficient information regarding the factors affecting the environmental impacts of alien species. In particular, little is known about whether there is any relationship between the invasiveness (establishment and spread) of an introduced species and its per capita impact. We experimentally assessed the relationship between the extent of spread of up to 29 alien plant species and their impact on recruitment of native tree species in Amani Botanical Garden, Tanzania. We also studied the effects of allelochemicals of selected alien on native plant species to assess potential mechanisms of impact. We found no relationship between the extent of spread of an alien tree species and their impact on seed germination, seedling survival, and seedling communities of native trees in their understory, and no indication that allelochemicals consistently explain their effects on recruitment of the studied species. These results suggest that extent of spread cannot be used as a proxy for impact. Hence, managers should continue assessing both the spread and the impact of alien species when prioritizing alien species for management.
机译：关于影响外来物种对环境的影响的因素的信息不足。尤其是，对于引进物种的入侵（建立和传播）与其人均影响之间是否存在任何关系鲜为人知。我们通过实验评估了坦桑尼亚阿曼尼植物园中多达29种外来植物物种的扩散程度及其对招募本地树种的影响之间的关系。我们还研究了选定外星人的化感物质对天然植物物种的影响，以评估潜在的影响机制。我们发现，外来树种的扩散程度及其对种子萌发，幼苗存活以及下层原生树幼苗群落的影响之间没有关系，也没有迹象表明化感物质能够始终如一地解释其对研究物种招募的影响。这些结果表明，传播程度不能用作影响的代理。因此，管理人员在优先管理外来物种时应继续评估外来物种的扩散和影响。

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