Exotic Prosopis juliflora suppresses understory diversity and promotes agricultural weeds more than a native congener
Exotic Prosopis juliflora suppresses understory diversity and promotes agricultural weeds more than a native congener
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DOI：
10.1007/s11258-020-01040-1
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发表时间：
2020-05
期刊：
影响因子：
1.7
通讯作者：
Mandy L. Slate;Mandy L. Slate;François Mitterand Tsombou;R. Callaway;Inderjit;A. El-Keblawy
中科院分区：
文献类型：
--
作者：
Mandy L. Slate;Mandy L. Slate;François Mitterand Tsombou;R. Callaway;Inderjit;A. El-Keblawy
外来入侵植物物种改变了生态系统，并在当地灭绝了本地植物物种，从而改变了群落结构。如果入侵者促进具有某些特征的物种，那么群落结构的变化可能特别重要。例如，大多数入侵者对土壤肥力的积极影响可能会促进具有杂草特征的物种，无论是本地的还是非本地的。我们研究了两种共存的Prosopiscongeners，nativeP。cineraria和外来入侵者在阿拉伯联合酋长国，对被确定为“农业杂草”的物种和不是农业杂草的物种进行了研究。与开放地块相比，P. cinerariacanopies与非杂草的丰富度和密度较低相关，而对农业杂草物种没有影响。与此相反，有较低的丰富度和密度的非杂草下的P。胡杨花，但更高的密度比在周围的树冠开放的农业杂草。这些模式与牧豆树同源物和林下植物群落组成可能是由于更高的凋落物沉积，如果凋落物是抑制性的，和浅根生物量低于P。juliflora，或对应于两个Prosopiscanopies不同的土壤性质。总体而言，土壤含氮量高于磷。胡里弗洛拉坦P.瓜伊拉，和两个林下比土壤在开放更肥沃。我们的研究结果表明，进化历史可能发挥作用，外来入侵物种可能会选择一些性状超过其他植物群落，与外来入侵者可能会创造水库的农业杂草。
Exotic invasive plant species alter ecosystems and locally extirpate native plant species, and by doing so alter community structure. Changes in community structure may be particularly important if invaders promote species with certain traits. For example, the positive effects of most invaders on soil fertility may promote species with weedy traits, whether native or not. We examined the effects of two co-occurringProsopiscongeners, the nativeP. cinerariaand the exotic invaderP. juliflora, on species identified as “agricultural weeds” and species that were not agricultural weeds in the United Arab Emirates. When compared to plots in the open,P. cinerariacanopies were associated with lower richness and density of non-weeds while having no impact on agricultural weed species. In contrast, there was lower richness and densities of non-weeds under canopies ofP. juliflora, but higher densities of agricultural weeds than in the open surrounding the canopies. These patterns associated withProsopiscongeners and understory plant community composition might be due to the much higher litter deposition, if litter is inhibitory, and shallow root biomass underP. juliflora, or the different soil properties that corresponded with the twoProsopiscanopies. In general, soils contained more nitrogen underP. juliflorathanP. cineraria, and both understories were more fertile than soil in the open. Our results suggest that evolutionary history may play a role in how exotic invasive species may select for some traits over others in plant communities, with an exotic invader potentially creating reservoirs of agricultural weeds.