Study on competition index of different typical forest types on Lin'an region

Competition has an important impact on the growth of trees, and the competition index is usually used to quantitatively describe the competitive relationship between trees. Taking the arbor forest in Lin'an District, Hangzhou City, Zhejiang Province as the object, using the forest resource monitoring data of Lin'an District in 2004, the Hegyi competition based on the Voronoi diagram Index, which analyzes the competition relationship among various forest types in Lin'an District on a regional scale. The results show that at the single tree level, the total competition index, intraspecific competition index, and interspecific competition index of individual trees of different forest types are at breast height 5 -10 cm is the largest; the average competition index of single trees decreases with the increase of DBH, and the competitive pressure of DBH> 30 cm is relieved; the competition of forest trees in Lin'an District mainly comes from intraspecific competition, and the intraspecific competition of natural for