泡桐是玄参科泡桐属的高大乔木,为我国特有的优质速生树木种类。生长十分迅速,将根段埋在适宜的土壤中,当年高可达4米。旅顺动物园内的5年生泡桐,树高9米,胸径24.5米,故有“三年成林、五年成檩、七年成梁”之说,是营造速生用材林和四旁绿化的优良树种。 Paulownia is Scrophulariaceae genus Paulownia tall trees, for our unique high-quality species of fast-growing trees. Growth is very rapid, the roots buried in the appropriate soil, then up to 4 meters. The 5-year-old paulownia in Lushun Zoo is 9 meters tall and 24.5 meters in diameter with a diameter of 24.5 meters. Therefore, it is said that “three years of succession, five years of succession and seven years of succession” means that it is a good tree species for afforestation and afforestation.