基于Voronoi图的异龄林单木成熟的确定方法

Confirmation Method of Mature Level in Uneven-aged Forest Based on Voronoi Diagram

以长白山林区天然异龄混交林为研究对象,基于4块固定标准地(总面积2 hm2)30多年的定株观测数据,采用Voronoi图空间分割方法,对各树种潜在生长空间的确定,得到了各树种单位面积平均蓄积生长量。结果表明:各树种单位面积平均蓄积生长量出现最大值的径级各不相同;在长白山林区,对天然异龄混交林进行径级择伐作业时,云杉、冷杉、红松、椴树、枫桦允许保留的最大径级分别为46、44、40、36、28 cm。

In the natural uneven-aged mixed forest of Changbai Mountains, with four fixed standard ground of 2 hm2 and the con- tinuous data of 30 years, we used the Voronoi polygons to divide the space, and then discussed the relation between the size class and the volume growth in the unit area to determine the area potentially available of each species. The relation-ship between the different tree diameters class and the growth per unit area in different tree species was a unimodal curve, and the unimodal curve of the highest point on each were not identical. In the Changbai Mountains, when selective cutting operations in the natural uneven-aged mixed forest with different age, the largest diameter class was 46, 44, 40, 36 and 28 cm for spruce, fir, Korean pine, basswood, maple and birch, respectively.