北京山区森林生态系统三维褶皱指数

Three-Dimensional Pleat Index of Forest Ecosystem in Beijing Mountainous Areas

在北京山区9个自然保护区(林场)设置了10块公顷级标准地,通过对乔木基本因子的调查,运用Delaunay三角网技术,建立了森林生态系统三维褶皱指数。结果表明:在所选取的10块样地中,5号样地三维褶皱指数最大,森林生态系统结构最为稳定;9号样地三维褶皱指数最小,森林生态系统结构相对最不稳定。通过对比分析,森林生态系统三维褶皱指数的大小不仅能够反映森林生态系统稳定性的强弱,而且计算过程突破了树种的限制,为评价森林生态系统的稳定性提供了参考。

A study was conducted to establish a three-dimensional pleat index for forest ecosystem in Beijing mountainous areas using the technology of Delaunay triangulation. Ten pieces of hectare-grade sample plots in 9 nature reserves or forest farms were selected for a survey of the basic factors of arbors. Results showed that, in the 10 pieces of sample plots, the three- dimensional pleat index of plot 5 is the maximum, and the forest ecosystem structure is the most stable ; while the three-dimensional pleat index of plot 9 is the minimum, and its structure is the most unstable. Comparative analysis shows that the three-dimensional pleat index can not only reflect the stability of forest ecosystem, but also make a breakthrough in tree species limit in calculation process