PDF(Pubmed)
Abstract：
Beyond ecological and health impacts, invasive alien plant species can generate indirect and direct costs, notably through reduced agricultural yields, restoration, and management of the invaded environment. Acacia dealbata and Ailanthus altissima are invasive plant species that cause particularly significant damage to the railway network in the Mediterranean area. The allelopathic properties of Mediterranean plant species could be used as nature-based solutions to slow down the spread of such invasive plant species along railway borders. In this context, a mesocosm experiment was set-up: (i) to test the potential allelopathic effects of Cistus ladanifer, Cistus albidus, and Cotinus coggygria leaf aqueous extracts on seed germination and seedling growth of A. dealbata and A. altissima; (ii) to evaluate whether these effects depend on the extract dose; and finally, (iii) to estimate whether these effects are modified by soil amendment. Leaf aqueous extracts of the three native plant species showed negative effects on both seed germination and seedling growth of the two invasive species. Our results show that the presence of allelochemicals induces a delay in seed germination (e.g., A. dealbata germination lasted up to 269% longer in the presence of high-dose leaf aqueous extracts of C. coggygria), which can lead to a decrease in individual recruitment. They also highlight a decrease in seedling growth (e.g., high-dose C. coggygria leaf aqueous extracts induced a 26% decrease in A. dealbata radicle growth), which can alter the competitiveness of invasive species for resource access. Our results also highlight that compost addition limits the inhibitory effect of native Mediterranean plants on the germination of invasive alien plants, suggesting that soil organic matter content can counteract allelopathic effects on invasive alien plants. Thus, our findings revealed that the allelopathic potential of certain Mediterranean plant species could be a useful tool to manage invasive plant species.
摘要：
除了生态和健康影响，外来入侵植物物种会产生间接和直接成本，特别是通过降低农业产量，restoration,以及对被入侵环境的管理。阿拉伯相思和艾兰香是入侵植物物种，对地中海地区的铁路网造成特别严重的破坏。地中海植物物种的化感特性可以用作基于自然的解决方案，以减缓此类入侵植物物种在铁路边界上的传播。在这种情况下，建立了一个中观实验：（i）测试Cistusladanifer的潜在化感作用，CistusAlbidus,和Cotinuscogggria叶水提取物对A.dealbata和A.altissima的种子萌发和幼苗生长；（ii）评估这些影响是否取决于提取物的剂量；最后，(iii)估计土壤改良剂是否改变了这些影响。三种本地植物的叶水提取物对两种入侵物种的种子萌发和幼苗生长均具有负面影响。我们的结果表明，化感物质的存在会导致种子萌发的延迟(例如，在C.coggygria）的高剂量叶水提取物的存在下，A.dealbata发芽持续时间长达269％，这可能导致个人招聘减少。他们还强调了幼苗生长的减少(例如，高剂量C.coggygria叶水提物诱导了A.dealbata胚根生长减少了26％），这可以改变入侵物种获取资源的竞争力。我们的结果还强调，堆肥的添加限制了地中海本地植物对外来入侵植物萌发的抑制作用，表明土壤有机质含量可以抵消外来入侵植物的化感效应。因此，我们的发现表明，某些地中海植物物种的化感潜力可能是管理入侵植物物种的有用工具。
