为研究林木竞争机制,优化林分结构和调整抚育间伐技术,以汪清林业局蒙古栎次生林为研究对象,构建了蒙古栎自由树的冠幅模型,提出了影响力因子、影响圈共生模式识别因子,量化单木竞争状态。基于108棵蒙古栎优势木数据,采用调整系数法构建蒙古栎自由树的冠幅与胸径相关的冠幅模型为CIW =0.1094 +0.299 8xD;采用影响力因子来确定林分中任意对象木的竞争木;将对象木的影响圈与其竞争木的影响圈之间的共生模式划分为4种类型,利用影响圈共生模式识别因子(FSI) 进行共生模式判断,分别4种共生模式确定树冠重叠面积的计算方法。基于不同的共生模式,运用相应的竞争压力指数(CSI) 计量模型计算CSI值,并通过案例分析,得到样木CSI值为439。

To study the competition mechanism of trees,and optimize it,s structure and adjust thinning technology to Wangqing Quercus monyolica secondary forest, this article builds the crown model of the Quercus monyolica free-tree and the influential factor and the circle of influence symbiotic mode judgment factor. Based on the 108 of the Quercus monyolica advantages trees data,using regression analysis,adjusting the coefficient associated with the construction of crown and DBH model of Quercus mongolica advantage trees,the result for CW =0. 1094 +0. 2998 * D. Based on the definition of forest competition,the influential factor was used to determine the competition wood of the object wood. The symbiotic mode between the influence circle of objects wood and the influence circle of competition wood was divided into four types,the determine factors affecting the symbiotic circle FSI was used to judge the symbiotic mode and calculate the various symbiotic mode crown overlapping area. Based on different models, the corresponding competitive pressure index CSI measurement model was used to calculate the value. And the case was studied,the CSI value of the sample tree was 439.