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Establishment dynamics of native and exotic plants after disturbance along roadsides
Applied Vegetation Science ( IF 2.0 ) Pub Date : 2020-02-17 , DOI: 10.1111/avsc.12481 Daria Corcos 1 , Juri Nascimbene 2 , Marta Campesan 1 , Davide Donadello 1 , Veronica Segat 1 , Lorenzo Marini 1
Applied Vegetation Science ( IF 2.0 ) Pub Date : 2020-02-17 , DOI: 10.1111/avsc.12481 Daria Corcos 1 , Juri Nascimbene 2 , Marta Campesan 1 , Davide Donadello 1 , Veronica Segat 1 , Lorenzo Marini 1
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QUESTIONS: How does small‐scale soil disturbance influence establishment dynamics of native and exotic species along roadsides? Does soil disturbance provide potential opportunities to exotic invasions along elevational gradients? Does the established plant community after disturbance reflect the surrounding vegetation? LOCATION: Prealps, Italy. METHODS: To disentangle the role of elevation and soil disturbance in promoting exotic invasions, we performed a manipulative experiment along 12 roads spanning an elevational gradient of ca. 1,200 m. Additionally, we sampled species richness of native and exotic plants in the surroundings of the experimental plots. RESULTS: Soil disturbance reduced species richness of native plants, total plant biomass and vegetation cover compared to the undisturbed plots. The decrease in species richness of natives and plant biomass was stronger at higher than lower elevations, suggesting higher colonization opportunities for exotics. However, exotic species richness did not increase with disturbance, probably due to a low propagule and colonization pressure. We observed strong species replacement between control and disturbed plots, indicating that plant communities established after disturbance were not a subset of species communities already occurring in the surrounding vegetation. CONCLUSIONS: With increasing elevation, disturbance had a stronger negative effect on native than on exotic species. Higher elevations, hitherto considered to have low invasibility, may provide new potential colonization opportunities for exotics but only if disturbance is coupled with an increased propagule pressure. Disturbance along roadsides promoted the establishment of species that did not occur in the surrounding vegetation.
中文翻译：
路边干扰后本地和外来植物的建立动态
问题：小规模土壤扰动如何影响路边本地和外来物种的建立动态？土壤扰动是否为沿海拔梯度的外来入侵提供了潜在机会？干扰后建立的植物群落是否反映了周围的植被？地点：意大利普雷阿尔普斯。方法：为了弄清海拔和土壤扰动在促进外来入侵中的作用，我们沿着跨越约 10 米高程梯度的 12 条道路进行了操纵实验。1,200 米。此外，我们在实验地块周围对本地和外来植物的物种丰富度进行了采样。结果：与未受干扰的地块相比，土壤干扰降低了本地植物的物种丰富度、植物总生物量和植被覆盖度。与低海拔相比，本地物种和植物生物量的物种丰富度下降幅度更大，表明外来物种的殖民机会更高。然而，外来物种的丰富度并没有随着干扰而增加，这可能是由于繁殖和定植压力低。我们观察到控制地块和受干扰地块之间的强烈物种替换，表明干扰后建立的植物群落不是周围植被中已经存在的物种群落的子集。结论：随着海拔的增加，干扰对本地物种的负面影响比对外来物种的负面影响更大。更高的海拔，迄今为止被认为具有较低的侵袭性，可能为外来物种提供新的潜在殖民机会，但前提是干扰与繁殖压力增加相结合。
更新日期：2020-02-17
中文翻译：
路边干扰后本地和外来植物的建立动态
问题：小规模土壤扰动如何影响路边本地和外来物种的建立动态？土壤扰动是否为沿海拔梯度的外来入侵提供了潜在机会？干扰后建立的植物群落是否反映了周围的植被？地点：意大利普雷阿尔普斯。方法：为了弄清海拔和土壤扰动在促进外来入侵中的作用，我们沿着跨越约 10 米高程梯度的 12 条道路进行了操纵实验。1,200 米。此外，我们在实验地块周围对本地和外来植物的物种丰富度进行了采样。结果：与未受干扰的地块相比，土壤干扰降低了本地植物的物种丰富度、植物总生物量和植被覆盖度。与低海拔相比，本地物种和植物生物量的物种丰富度下降幅度更大，表明外来物种的殖民机会更高。然而，外来物种的丰富度并没有随着干扰而增加，这可能是由于繁殖和定植压力低。我们观察到控制地块和受干扰地块之间的强烈物种替换，表明干扰后建立的植物群落不是周围植被中已经存在的物种群落的子集。结论：随着海拔的增加，干扰对本地物种的负面影响比对外来物种的负面影响更大。更高的海拔，迄今为止被认为具有较低的侵袭性，可能为外来物种提供新的潜在殖民机会，但前提是干扰与繁殖压力增加相结合。
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