本研究乃針對臺中市區14種、3404株常見之行道樹進行調查，破壞率為65.63%。發 現不同樹種造成之破壞率不同，如美人樹之根系破壞力小，雨豆樹以及鳳凰木破壞率則相對 高許多。不同之樹種當植株日漸粗大時，其莖幹基部之發展狀況也有所不同，如高齡剌桐之 幹基會肥大，另同為桑科之榕樹、垂榕與緬樹之根系極發達，易發生環根。榕樹與鳳凰木之 板根極發達，對鋪面破壞力強，不適合種植在都市狹小的人行道上。 黑板樹與剌桐之胸高直徑與對鋪面之破壞程度呈顯著之正相關。不同樹種造成鋪面或路 緣石破壞之胸高直徑是不同的，胸高直徑達10公分以上之黑板樹與樟樹，種在窄小的（<1x1 公尺）植穴中，就會造成水泥鋪面破裂，但種在連續之植栽帶中較不易造成破壞。當植栽穴 之表面有地被植物時，破壞率也明顯降低。 A total of 3404 street trees were surveyed in Taichung, 65.63 percent were causing damage to pavements and kerbs. There were significant differences in the proportions of trees of differnet species causing pavements and kerbs damage. Samanea saman, Delonix regia, Ficus benjamina, Ficus microcarpa and Ficus elastica may cause more significant damage than other species. The large-growing trees, Samanea saman, Delonix regia and Ficus microcarpa should not be grown in confined spaces. Damage was found to increase with tree size(dbh). There were species differences in the size at which damage became noticeable. Alstonia scholaris and Cinnamomum camphora started to cause damage when they wre 11-20cm dbh, but Chorisia speciosa did not generally cause until dbh>40cm. Trees planted into pavement caused more significant damage than trees planted in planting strips. When possible, the use of groundcovers would avoid the pavement damage.
