西江林业局尾巨桉人工林一元材种出材率表编制

Compiling of the one-way function merchantable volume table of E. urophylla × E. grandis in Xijiang Forestry Bureau

在广东省西江林业局尾巨桉无性系人工林中选择并设置70个标准地,分别进行林分因子调查,同时选择163株样木以2.0 m或2.6 m段材长分径阶进行样木伐倒造材,以实际经济材造材出材率为基础拟合并选择较优的单株木一元材积比方程,然后根据材积比方程进行理论造材并编制尾巨桉单株木一元经济材出材率表;接着利用单株木一元经济材出材率表对所调查的标准地进行理论造材,以林分理论造材出材率为基础拟合并选择较优的林分一元材积比方程,最后根据材积比方程研制尾巨桉林分一元经济材出材率表。所编制的数表均符合国家精度检验标准,可为本地区桉树生产经营提供参考。

70 sample plots were set in clonal plantation of E.urophylla × E.grandis in Xijiang Forestry Bureau and stand factors of the sample plots were surveyed separately.According to diameter class,163 sample trees were selected.The sample trees were cut down and dissected in accordance with 2.0m or 2.6m.Based on actual merchantable volume,one-way equations of merchantable volume for single tree were built and a superior equation was selected.Subsequently,the sample trees were dissected to gain theoretical merchantable volume according to superior equation.Then,the one-way function merchantable volume table of E.urophylla × E.grandis for single tree was compiled.All of trees in the sample plots were dissected to gain theoretical merchantable volume according to one-way function merchantable volume table.Based on theoretical merchantable volume for stand,one-way equations of merchantable volume for stand were built and a superior equation was selected.Finally,one-way function merchantable volume table of E.urophylla × E.grandis for stand was compiled according to superior equation.The tables＇ precision is up to state requirements and the tables can provide reference for the production of Eucalyptus in the region.