行道树,就是种在城市行道两旁的树木,它是城市生态系统及城市文明的重要组成部份。城市行道是人工特化了的人工环境,地面、地下及空间都建有各种功能的设施,如下水道、通讯,建筑物地基等。在选择行道树种的时候要注意树种的生物学特性。 Road trees, is planted in the city sidewalk trees, it is an important part of urban ecosystems and urban civilization. Urban pavement is an artificially engineered artificial environment with facilities of various functions on the ground, underground and space, such as sewers, communications and building foundations. When choosing a tree species, pay attention to the biological characteristics of species.