1980年,某校绿化队将操场四周和中间一行栽植了白皮松和馒头柳,株距4米,一株松一株柳,共31株柳30株白皮松,其目的是要形成巨松在上、柔柳居下的美好景观。载种时松树9岁、柳树1岁,二者高度相近,但株距过小。几年后柳树枝繁叶茂,也略高过松树了,柳遮松的斗争日渐激烈起来。白皮松生长较慢,柳 1980, a school greening team will be surrounded by the playground and the middle row of white bark pine and bread Liu, spacing 4 meters, a pine a willow, a total of 31 willow 30 strains of white bark pine, the purpose is to form giant pine in the soft Willow home beautiful landscape. When loading, the pine tree was 9 years old and the willow tree was 1 year old, both of which were highly similar, but the plant spacing was too small. Willow branches flourish a few years later, also slightly higher than the pine tree, the struggle of willow shelter increasingly fierce. Pinus bungeana grow slower, Liu