Homogenization of plant diversity, composition, and structure in North American urban yards

Homogenization of plant diversity, composition, and structure in North American urban yards
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北美城市庭院植物多样性、组成和结构的同质化

DOI:
10.1002/ecs2.2105
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发表时间:
2018
期刊:
影响因子:
2.7
通讯作者:
Hall, Sharon J.
Hall, Sharon J.
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Pearse, William D.;Cavender-Bares, Jeannine;Hobbie, Sarah E.;Avolio, Meghan L.;Bettez, Neil;Roy Chowdhury, Rinku;Darling, Lindsay E.;Groffman, Peter M.;Grove, J. Morgan;Hall, Sharon J.

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人们普遍认为,城市生态系统比自然生态系统更具有生态同质性。我们认为,城市植物群落组装从一个复杂的混合园艺和区域物种池,并通过比较种植和自发发生的城市植被自然面积植被在美国七个主要城市的同质化假说进行评估。对城市多样性同质化的支持有限,因为种植和自然庭院植物群的物种数量比自然区域多,种植的系统发育多样性也更大。然而,城市庭院显示出成分和结构均匀化的证据。庭院组成更相似的地区比自然区域,树木密度是可变的院子里比可比的自然区域。这种生物多样性的同质化可能反映了美国各城市相似的园艺资源池、房主偏好和管理实践。
Urban ecosystems are widely hypothesized to be more ecologically homogeneous than natural ecosystems. We argue that urban plant communities assemble from a complex mix of horticultural and regional species pools, and evaluate the homogenization hypothesis by comparing cultivated and spontaneously occurring urban vegetation to natural area vegetation across seven major U.S. cities. There was limited support for homogenization of urbandiversity, as the cultivated and spontaneous yard flora had greater numbers of species than natural areas, and cultivated phylogenetic diversity was also greater. However, urban yards showed evidence of homogenization ofcompositionandstructure. Yards were compositionally more similar across regions than were natural areas, and tree density was less variable in yards than in comparable natural areas. This homogenization of biodiversity likely reflects similar horticultural source pools, homeowner preferences, and management practices across U.S. cities.
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