早演替草甸中糙皮梨的入侵不影响林下植被的丰度和多样性

IF 1.3 4区 生物学 Q3 PLANT SCIENCES
Andrea N. Nebhut, Jeffrey S. Dukes
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引用次数: 0

摘要

摘要入侵植物与寄主群落间的性状差异调节了入侵植物对群落组成的影响。梨(Pyrus calleryana Decne.)是一种生长迅速,耐应力的原产于中国的树木,因其观赏价值而被广泛种植。近几十年来,糙孢单胞菌已在美国东部归化,在那里传播迅速,并在早期演替环境中达到高丰度。本文比较了印第安那州东部玉米带平原3个早期演替草甸低密度、成长期和功能相似的原生乔木对林下群落多样性和总覆盖度的影响。结果表明,与土生鹅毛楸、西洋Platanus occidentalis L.和非乔木对照区相比,低密度石斛种群对林下植物群落的总覆盖度、物种丰富度和多样性指数的影响不显著,与土生乔木和非乔木对照区相比,石斛种群对林下植物群落的总体丰度和多样性指数的影响不显著。同样,研究群体对林下群落的原生亚群、引种亚群、木本亚群和原生乔木亚群也没有显著影响。这些结果表明,在早期演替草甸的低密度年轻种群中,糙皮草与功能相似的原生乔木之间的性状差异不足以引起群落组成的变化。展望未来,对糙孢单胞菌对群落组成和生态系统过程的影响的补充研究将使我们更全面地了解这种广泛的入侵者如何破坏其宿主生态系统。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Invasion by Pyrus calleryana does not affect understory abundance or diversity in early-successional meadows
Abstract Trait differences between invasive plants and the plants in their recipient communities moderate the impact of invaders on community composition. Callery pear ( Pyrus calleryana Decne.) is a fast-growing, stress-tolerant tree native to China that has been widely planted for its ornamental value. In recent decades, P. calleryana has naturalized throughout the eastern United States, where it spreads rapidly and achieves high abundance in early-successional environments. Here we compare the impacts of low-density, establishment-phase P. calleryana to those of functionally similar native trees on the understory community diversity and total cover of three early-successional meadows in Indiana’s eastern corn belt plains. In contrast to our prediction that P. calleryana would have greater negative effects on the total abundance and diversity of the understory plant community compared to native Liriodendron tulipifera L., Platanus occidentalis L., or non-tree control plots, we found that these low-density populations of P. calleryana had no significant impact on total cover, species richness, or diversity indices for the understory community, compared to the native trees and non-tree control plots. Likewise, the studied populations of P. calleryana had no significant impact on the native, introduced, woody, or native tree subsets of the understory community. These results indicate that in young, low-density populations situated in early-successional meadows, the trait differences between P. calleryana and functionally similar native trees are not of a great enough magnitude to produce changes in community composition. Going forward, complementary research on the impacts of P. calleryana on community composition and ecosystem processes in areas with long-established, dense invasions or invasions in more sensitive ecosystems would allow us to more fully understand how this widespread invader disrupts its host ecosystems.
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来源期刊
CiteScore
2.20
自引率
9.10%
发文量
24
审稿时长
6-12 weeks
期刊介绍: Invasive Plant Science and Management (IPSM) is an online peer-reviewed journal focusing on fundamental and applied research on invasive plant biology, ecology, management, and restoration of invaded non-crop areas, and on other aspects relevant to invasive species, including educational activities and policy issues. Topics include the biology and ecology of invasive plants in rangeland, prairie, pasture, wildland, forestry, riparian, wetland, aquatic, recreational, rights-of-ways, and other non-crop (parks, preserves, natural areas) settings; genetics of invasive plants; social, ecological, and economic impacts of invasive plants and their management; design, efficacy, and integration of control tools; land restoration and rehabilitation; effects of management on soil, air, water, and wildlife; education, extension, and outreach methods and resources; technology and product reports; mapping and remote sensing, inventory and monitoring; technology transfer tools; case study reports; and regulatory issues.
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