倒榆(UImus pumila),又名垂榆,属榆科,白榆属。树冠呈伞形,枝叶茂密,柔枝下垂,树形优美,类似龙爪槐,是庭园绿化观赏的好树种。倒榆原产新疆伊犁,1981年冬我所从内蒙古自治区林科院引进种条,翌春用普通白榆作砧木,进行嫁接繁殖获得成功。几年试验证明,倒榆繁殖容易,生长快,适应性强。用白榆作砧木,因其耐寒、耐旱、耐盐硷,在沙土、黄土、盐硷地上均可栽植。一、砧木的培育嫁接繁殖倒榆,应先培育砧木大苗。砧 Ulmus (UImus pumila), also known as vertical elm, is elm, white elm. Crown was umbrella-shaped, dense foliage, soft sticks drooping, beautiful tree, similar to Longhuhuai, garden ornamental good tree species. Inverted Yu native Xinjiang Ili, in the winter of 1981 I from the Inner Mongolia Autonomous Region Academy of Forestry introduced species, the next spring with common white elm as stock, grafting success. Tests proved that several years, down elm reproduction easy, fast growth, adaptability. With white elm as rootstock, because of its cold, drought, salt-resistant, in the sand, loess, saline alkali can be planted on the ground. First, the cultivation of rootstocks Reproduction of inverted elm, should first cultivate rootstock seedlings. anvil