杉木人工林林分出材率表编制方法的研究

On outturn table of stand of Chinese fir plantation

应用单株木二元材积方程、二元材种出材率表计算林分蓄积量和出材量的基本原理 ,推导出编制林分出材率表的计算公式。在此基础上 ,利用杉木人工林现场实际造林样木 ,选择Richards方程建立以胸径、树高为辅助因子的累积材种出材率模型 ,据以估计单株材种出材率。然后 ,分别应用直径分布参数回收技术法和相对树高曲线模型 ,预测林分各径阶株数概率及径阶平均高 ,结合二元材积方程 ,编制了杉木人工林林分出材率表。表 1参

Caculating equations of drawing out the out turn percentage table of stands is reckoned based on the cardinal principle of general volume equation of single tree,volume calculation by general out turn percentage table of woodcategory and out turn quantity of stand.Further more,the model of accumulative out turn quantity of wood category is established based on auxiliary factors of the diameter and height according to Richards equation and the materials of actural bucking of sample trees on the spot,and the out turn percentage table of stand for Chinese fir plantation is made by applying the technique of parameter rescovery of diameter distribution and the relative diameter height curve model and by forecasting the height and individuals probability in each diameter class with general volume equation.