辽西地区现有大面积油松纯林,目前由于病虫害的蔓延和危害,生长上受到严重影响,而且生态上也不稳定.因此今后应适当压缩油松比例,增加阔叶树种,把油松纯林改造为油松阔叶混交林.1983年,我们所与凌源欺天林场合作,在该场选用1970年营造的、保存率在80%的油松纯林作为试验地,采用横山带状皆伐的方法,在砍伐带上栽植了刺槐、沙棘、黄栌、柠条等阔叶树种,改造成油松阔叶混交林150亩,如今长势良好.改造后的16年生油松刺槐混交林,亩 Currently, large-scale pure stands of Pinus tabulaeformis in western Liaoning are presently severely affected by the spread and damage of pests and diseases, and are ecologically unstable. Therefore, in the future, the proportion of Pinus tabulaeformis should be reduced and the species of broad-leaved trees should be increased. In 1983, we cooperated with Lingyuan Chestnut Forest Farm to select the Pure Forest of Pinus tabulaeformis which was constructed in 1970 and preserved at 80% Cutting method, cutting trees in the deforestation planted with acacia, seabuckthorn, sclarea, kadaiwa and other broad-leaved species, transformed into a mixed pine and broad-leaved forest 150 acres, and now the good. After transformation of the Pinus tabulaeformis and acacia locust mixed forest, mu