白榆生长快,材质好,抗干旱,抗盐碱,是北方干旱地区造林的主要树种。我场从60年代到80年代初营造了大片白榆林。由于对其生物学特性了解不深,采取了不适当的修枝方法,致使林木形成多头丛生的“卡脖”枝和无明显主头的树冠,生长缓慢。同时由于枝条比较粗,春季修剪引起树木伤流比较严重。为此我们从1673到1979年,对白榆的修枝技术进行了研究。本文主要论述白榆修枝时间、修枝强度和修枝技术与林木生长的 Elm grow fast, good material, anti-arid, anti-saline, is the main afforestation species in northern arid areas. My field from the 60s to the early 80s to create a large white Yulin. Due to its poor understanding of its biological characteristics, inappropriate pruning methods have been adopted, resulting in the growth of forest crowded “Kabu” branches and crown without obvious main branches. At the same time as the branches are thick, spring pruning caused by more serious injury to trees. To this end we from 1673 to 1979, the elm pruning techniques were studied. This article mainly discusses the elm pruning time, pruning strength and pruning techniques and tree growth