近几年,我市速生丰产林发展很快。1981年以来全市营造杨树速生丰产林22107.6ha,均处于未郁闭状态。对此,在修枝管理上,有着不同看法,我们从促进树木生长的观点出发,于1984—85年在喀左县官大海农场对赤峰杨进行了不同修枝强度对比试验,现将试验结果初报如下。 In recent years, fast-growing and high-yield forest in our city has developed rapidly. Since 1981, the city has built 22107.6ha of fast-growing high-yield poplar trees, all of which are in a non-depressed state. In this regard, the pruning management, have different views, we promote the growth of trees from the point of view, in 1984-85 in the farm in Kaizu County officers Chifeng Yang different pruning strength comparison test, the test results First reported as follows.