思茅松人工林林分密度控制图的编制与应用

在思茅松人工林集中分布的西双版纳、思茅地区的 10个县 (市 ) ,按照立地条件、年龄、郁闭度、生长状况等的不同 ,设置 16 6块标准地 ,用以编制林分密度控制图 ,包括等树高线、等直径线、最大密度 (饱和密度 )线、等疏密度线、等自然稀疏线等 5条曲线 ,根据密度控制图可以求算林分蓄积量、疏密度、优势高 ;可以求算林分间伐量、间隔期进行间伐设计 ;可以预测各生长阶段的平均胸径、生长量等。经检验等树高线精度为 96 1% ,等直径线精度为 97 8%。

Workout and Application of Stand Density Control Chart of Pinus kesiya var. langbianensis

One hundred and sixty_six sample plots of Pinus kesiya var. langbianensis at different site conditions, forest ages, crown densities, growth situations, in the two main distribution area of P. kesiya , ten counties of Simao prefecture and Xishuangbanna prefecture were set out to work out stand density control chart of this tree species. The stand density control chart worked out included 5 curves, namely equivalent height curve, namely equivalent diameter curve, maximum density curve, equivalent density curve, equivalent self thinning curve. According to the density control chart, the volume, degree of density, dominant tree height of the P. kesiya stand, the amount of intermediate cutting, and intermediate cutting time could be worked out, and the operation of intermediate cutting could be designed the average diameter at breast height and increment could be forecasted as well. The accuracy of the density chart was verified as 96 1% of equivalent height curve and 97 8% of equivalent diameter curve.