抚育间伐的主要目的是为了提高林分的生长量和林木质量。随着树龄的增大以及林木的生长,原有的营养空间已不能满足林木的要求,生长受到抑制,生长量下降,尤其是胸径生长量明显下降时,就应该进行首次抚育采伐。抚育间伐起始期的确定, The main purpose of tending thinning is to increase the growth and quality of stand. With the increase of tree age and the growth of trees, the original nutrition space can no longer meet the demand of trees, the growth is inhibited, the growth is reduced, especially the growth of DBH is obviously decreased, the first deforestation should be carried out. Determine the beginning of tending thinning,