四川巨桉短周期工业原料人工林一元材积表的编制

The Drawing-up of One-varable Volume Table for Shortrotation Plantation of Eucalyptus grandis in Sichuan

本文调查、收集了四川省仁寿、高县、纳溪等县不同立地条件的巨桉短周期工业原料人工林标准地72块,样木112株。采用SAS程序,进行多方程拟合并比较各模型优劣,筛选出巨按材积模型:V=-0.0196154+0.0007494d2,编制了巨按短周期工业原料人工林一元材积表。经检验,平均误差为-0.01%,,标准差为±9.6%,均方误为±1.4%,精度达到要求。

72 sample plots were investigated in the short-rotation of plantations of Eucalyptus grandis with different ages and in different site conditions, which were distributed in Renshou County, Gaoxian County and Naxi County of Sichuan Province, and 112 sample trees were cut down for the volume table. With three different models, the statistics analysis was conducted by SAS program, and the best fit function V = - 0. 0196154 ＋ 0. 0007494 d^2 was selected for the drawing-up of one-variable volume table for short rotation plantation of Eucalyptus grandis. The average error, standard error and mean-square error are -0. 01%, ±9.6% and ±1.4% ,respectively, and its precision is suitable for the practice.