1、作者把间伐效果规定为通过间伐大量生产达到目的径级树木,用收获量—密度管理图收获予测法,通过比较间伐林分和非间伐林分的Y—N曲线,可以分析间伐效果。 2、把这种方法应用于阔叶天然林以及冷杉人工林。清楚地表明,两个林分都可以用这种方条取得较好地间伐效果。 3、过去经常用平均值标准计算间伐后树木的粗度,而在理论上没有明确大量获得目的径级以上树木的数量。在论文中,首次把林分的现实水平和目的径级以上树木株数的种群现实水平都加以说明了。 1. The authors defined the thinning effect as the mass production of trees of the order of magnitude through thinning and harvesting by the harvest-density management map. By comparing the Y-N curves of the thinned and non-thinned stands, we can analyze the thinning effect . 2, this method is applied to broad-leaved natural forests and fir plantation. It is clear that both sides of the plot can be used to achieve better cropping efficiency. 3. In the past, the average thickness of trees after the thinning was often calculated using the standard of averages. However, the number of trees above the target diameter was not clearly and theoretically obtained in large numbers. For the first time in the paper, the actual level of the stands and the actual population level of the trees above the target diameter are described.