NC | 全球城市树木组合的均质化与分化-流域人居系统研究中心

NC | 全球城市树木组合的均质化与分化

发布日期：2026-02-27

文章信息：Yang, X., Jin, J., Liu, X., La Sorte, F. A., Yan, P., Aronson, M. F. J., & Yang, J. (2026). Homogenization and differentiation of urban tree assemblages globally. Nature Cities. https://doi.org/10.1038/s44284-026-00393-4

整理人：徐嘉苗，2025级硕士研究生

整理时间：2026年2月27日

Abstract: Urbanization is affecting biodiversity globally. Biotic homogenization is often cited as a key consequence. However, our understanding of this phenomenon may be biased by flaws in the methods used to document it. Here we estimate compositional dissimilarity among 39 urban tree assemblages worldwide while controlling for differences among regional species pools. Our results demonstrated the absence of a distinct global pattern in urban tree homogenization or differentiation. Homogenization mainly occurred among urban tree assemblages across broad geographic distances, whereas differentiation occurred at short distances. Nonnative species were a major contributing factor to these patterns. Sharing different nonnative species contributed to differentiation at short distances, whereas sharing the same nonnative species contributed to homogenization at broad distances. Our findings reveal a scale-dependent effect of urbanization on urban tree assemblages driven by nonnative species, emphasizing the global influence of urbanization on spatial patterns of biodiversity.

摘要：城市化正在影响全球生物多样性。生物均质化常被视为关键结果。然而，我们对这一现象的理解可能因记录方法上的缺陷而有所偏见。本研究中，我们估算了全球39个城市树群的成分差异，同时控制了不同区域物种池之间的差异。我们的结果表明，城市树木同质化或分化中缺乏明显的全球模式。均质化主要发生在城市树群中，跨越较大地理距离，而分化则发生在短距离内。外来物种是这些模式的主要因素。共享不同的外来物种促进了短距离的分化，而共享相同的外来物种则促进了广距离的均质化。我们的发现揭示了城市化对由外来物种驱动的城市树木组合的尺度依赖效应，强调了城市化对生物多样性空间模式的全球影响。