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一、试验概况云杉抚育试验固定标地,由北京林学院于1953年在管涔山云杉天然林内设置,省林科所与管涔林局长期复查。设有3个抚育处理,1个对照,4次重复,16块标地。每块标地面积为0.16公顷,采用下层抚育法。至1982年,历时30年,已抚育3次,复查6次。从生长过程(表1)可见,随着抚育强度的加大,胸径、树高都有明显增加。三个处理的总蓄积量都超过了对照区,尤以强度处理区为最高。
First, the test profile Spruce tending test fixed place, by the Beijing Forestry College in 1953 in the natural forest spruce hills set, provincial Forestry Branch and Forest Bureau long-term review. There are 3 tending treatments, 1 control, 4 repetitions, 16 standard places. Each plot covers an area of 0.16 hectares, using the lower tending method. To 1982, which lasted 30 years, has been raised 3 times, review 6 times. As can be seen from the growth process (Table 1), with the increase of tending strength, the DBH and tree height have obviously increased. The total volume of the three treatments surpassed the control area, especially the intensity treatment area was the highest.