A Forest Competition Index Based on Intersection Angle | 基于交角的林木竞争指数
2013
Hui Gangying, Chinese Academy of Forestry， Beijing (China），Research Institute of Forestry | Hu Yanbo, Chinese Academy of Forestry， Beijing (China），Research Institute of Forestry | Zhao Zhonghua, Chinese Academy of Forestry， Beijing (China），Research Institute of Forestry
chinois. 建立基于交角的林木竞争指数（u_a_CIi）,该指数能够同时表达出竞争木对对象木的上方遮盖和侧翼挤压。该指数取值范围为[0,1）,无量纲,指数值越大,表明树体越小,所承受的竞争压力越大,清晰直观地表达林木在林分中所处的相对竞争态势。从理论上阐明大的竞争邻体比小的竞争邻体对对象木有更大影响,不仅反映在上方的遮盖也体现在侧方的挤压中。该指数与林木大小的相关性明显高于常用的HEGYI竞争指数。在测量技术飞速发展的今天,该竞争指数将具有很大的应用前景。
Afficher plus [+] Moins [-]anglais. This paper established a forest competition index （u_a_CI~） based on intersection angle. The competition index can precisely express the over shading and the lateral extruding from the competitive trees. Its value ranges from 0 to 1 and it is non-dimensional. The greater the competition index value, the smaller the tree size, and the greater the exposure to competitive pressure. The value also directly and clearly reflects the relative competition situation of trees in a stand. This explains in theory that large neighborhood tree has bigger influence on the object tree than that of the small neighborhood, which is not only reflected on the over shading but also the lateral extruding. The competition index has closer correlation with the tree size than the commonly used HEGYI-competition index does. Therefore, this competition index will has great application prospect along with the contemporary fast development of measuring technology.
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