从林分开始间伐至主伐的整个周期,平均胸径每增加一厘米,单位面积应伐除蓄积是个常数(近似值)。林分林木胸径的增长,树冠面积的扩大,必然引起林分内单位面积上立木株数的减少。根据这个规律,得出了落叶松人工林的立木株数(密度)与胸径的相关方程,利用这个相关方程计算了不同胸径生长阶段的林分最大密度及经营密度(最适密度)。把胸 From the beginning of thinning to the main cutting, the average DBH increase of one centimeter per unit area is a constant (approximation). Forest growth in diameter at breast height, crown area expansion, will inevitably lead to the stand area per unit area of ​​the reduced number of standing wood. According to this law, the correlation equation between the number of stand (DBH) and DBH of larch plantation was obtained. Based on this correlation equation, the maximum density and management density (optimal density) of stand at different DBH growth stages were calculated. Put the chest