钻天榆(群众也叫立枝榆)是白榆的优良自然类型。它生长快,干形圆满通直,枝条开张角度小。一般8-10年生胸径可达20-25厘米,树高18-20米,枝下高8-12米,主枝与树干夹角不超45度。它比一般白榆(群众也叫卧枝榆)高生长快1.5-2倍,木材材积生长快2-3倍。木材材质坚韧,有弹性,耐腐性强,不易劈裂,是群众盖房最常用的梁、檩材,也是矿柱、枕木、制造家具、门板、车辆、船等优良用材,是群众喜爱的优良树种。 Dried sky elm (the people also called Li Zhi) is an excellent natural type of elm. It grows fast, dry shape straight, branches opening angle is small. Generally 8-10 years old breast diameter up to 20-25 cm, height 18-20 meters, branches 8-12 meters high, the main branch and trunk angle not exceeding 45 degrees. It is 1.5-2 times faster than the average elm (the crowd also called lying stick elm) growth, timber volume growth 2-3 times faster. Timber material is tough, flexible, corrosion-resistant, not easy to splitting, is the most commonly used by the public housing the beam, lumber, pillars, sleepers, furniture, doors, vehicles, ships and other excellent timber, is the favorite Good tree species.