据我国有关部门规定,一般树龄在百年以上的大树即为古树;而那些树种稀有、名贵或具有历史价值、纪念意义的树木则可称为名木。古树名木的分级:古树分为国家一、二、三级。一级古树目前,不少地方规定,柏树类、白皮松、七叶树,胸径在60厘米以上,油松胸径在70厘米以上,银杏、国槐? According to the provisions of the relevant departments of our country, the general tree is more than a century old trees are old trees; and those species rare, valuable or historic value, commemorative trees can be called Mingmu. Grades of ancient trees: ancient trees are divided into one, two, three countries. An ancient tree At present, many local regulations, cypress, white bark, horse chestnut, diameter at 60 cm above the diameter of 70 cm or more, pine ginkgo, Sophora japonica?