香港与广州城市行道树群落比较研究

A COMPARATIVE STUDY OF ROADSIDE-TREE COMMUNITIES IN URBAN HONG KONG AND GUANGZHOU

尽管香港与广州的地理位置、人口规模和自然条件十分相似,但两者的市区行道树群落在规模、密度、种类构成和林相外观等方面均存在着显著差异。香港行道树的种类多样性和外来种构成均比广州丰富,但密度小于广州,且香港群落中树形较小的个体比重高于广州,显示其调节环境的功能较逊,文中还讨论了两地人文、自然方面的因素差异对城市行道树的构成栽培和生长所产生的影响。

As the major cities of the south China, Hong Kong and Guangzhou have nearly with simi-lar geographical and physical conditions. However, there are significant differences in the char-acteristics and composition of their magnitude of domination have their respective unique fea-tures. As a cosmopolitan city, Hong Kong has introduced more tree species and resulted in a roadside tree stock of richer species diversity and higher percentage of exotic composition than those of Guangzhou. With a different urban history and resulting city morphology , the aver-age density of roadside trees in Hong Kong is less than that in Guangzhou. Comparing with Guangzhou, Hong Kong' s roadside trees are dominated by species with small final-dimen-sions. The confined and high-density habitats in Hong Kong have limited more significantly the formation and growth of its roadside trees than those in Guangzhou.