我们对0.12公顷的上层疏伐(亦称择伐)和下层疏伐(亦称间伐)试验区,进行了伐前每木调查和采伐木调查,以后连续四年,每年均作了记载。从这些记载的数据中,得出了一些有意义的结果,以供参考。首先用材积计算出间伐强度为21%;择伐强度为28%。再把伐前的间伐区和择 We conducted a survey of per-tree surveys and harvesting logs on the upper dehalogenation (also known as selective cutting) and lower de-felling (also known as thinning) pilot areas of 0.12 hectares, and recorded them every year for four consecutive years. From these recorded data, we come to some meaningful results for reference. First, the thinning strength calculated by volume is 21%; the selective cutting strength is 28%. Then cut before the thinning area and choice