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管涔林局是我省云杉分布很集中的地区,云杉林占该局森林总面积的52.0%,占总蓄积量的59.6%。为了研究云杉林的抚育方法、间伐强度,促进林木生长、缩短培育年限,北京林学院于1953年设置了固定试验标准地。1957年原中林所进行了复查。1962年、1967年、1972年我们又作了调查,1962年还采取了间伐措施。现将调查的结果加以整理归纳,介绍如下。由于时间短促,水平所限,错误之处,可能不少,请批评指正。
Guanlin Forest Bureau is the distribution of spruce in our province is very concentrated area, spruce forest accounts for 52.0% of the total forest area, accounting for 59.6% of the total volume. In order to study the spruce forest tending methods, thinning intensity, and promote forest growth, shorten the incubation period, Beijing Forestry University in 1953 set a fixed test standard. In 1957 the original forest was reviewed. In 1962, 1967, 1972 we again conducted a survey and in 1962 we also took some measures of thinning. Now the survey results to be summarized, described below. Due to time constraints, the level of the limits of error, may be a lot of, please comment on criticism.