打印

作者

Yi Chen;Ying Ge;Zhaoping Wu;Yan Ouyang;Guofu Yang;Yuanyuan Du;Kaixuan Pan;Jie Chang

来源

URBAN FORESTRY & URBAN GREENING,Vol.66,Issue1,Article 127388

语言

英文

关键字

Artificial selection;Biotic homogenization;Biodiversity;Jaccard similarity index;Life form;Species composition

作者单位

College of Life Sciences, Zhejiang University, Hangzhou 310058, China;Institute of Environmental Sciences, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands;College of Life Sciences, Zhejiang University, Hangzhou 310058, China;Institute of Environmental Sciences, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands

摘要

The construction of urban green spaces usually leads to the replacement of native species by alien species, resulting in the homogenization of species composition across cities in different climatic zones. However, along a temperature gradient, whether tree species diversity and life form composition (evergreen vs. deciduous) are homogenized across cities has not been verified. In this study, we first compared the tree species diversity, life form composition, and species composition in green spaces among 29 cities in eastern China and then compared them with natural forests outside the cities. The results showed that (1) the increasing rates of tree species diversity (Shannon-Wiener and Simpson indices) in urban green spaces along the temperature gradient were less than half those in natural forests, indicating the convergence of tree species diversity across cities; (2) the similarity of tree species composition in green spaces across cities was higher than that in forests across natural regions, showing the homogenization of tree species composition across cities; (3) the similarity of tree species composition in green spaces between cities decreased with an increase in the temperature difference; (4) the increasing rate of the proportion of deciduous broad-leaved trees in the green spaces along the temperature gradient was ∼24 % slower than that in the natural forests, showing the homogenization of life form composition of trees across cities; and (5) there were 88 tree species widely used in more than half of the studied cities, and 60 % of them were used in cities outside their natural distribution areas. This study is helpful for understanding the effect of human activities on the biotic homogenization of green spaces and provides guidance for the policy-making of the construction and management of urban green spaces.