榆树是平原农区的主要造林树种之一,该树种适应性强、生长迅速、材质优良、用途广泛,深受群众喜爱,栽植历史悠久。1964年,我县南部的运粮河建成后,沿岸社队在河两岸种植白榆3-4行。株行距为2×2、1.7×2(米)两种规格。1980年全林平均树高达15米,平均胸径17.8厘米。根据需要,部分社队在这年冬季进行了皆伐利用。为了探索榆树速 Elm is one of the main afforestation species in the plain farming areas. The tree is adaptable, rapid growth, good material, wide range of uses, loved by the masses, planting a long history. In 1964, after the completion of Yun’e River in the southern part of the county, the coastal communes and teams planted 3-4 lines of white elm on both banks of the river. Line spacing of 2 × 2,1.7 × 2 (m) two specifications. In 1980 the average average tree height of 15 meters, the average diameter of 17.8 cm. According to the needs of some teams and teams in this winter were cleared use. In order to explore the elm speed