赤峰人工杨树二元立木材积表编制研究

Compilation on two-entry volume table of the artificial poplar in Chifeng area

以赤峰人工杨树(Populus)为研究对象,抽取样本637株,利用三倍标准差剔除异常数据样本3株,样本以冠型为依据划分2个编表单元,即大冠型杨和小冠型杨。以大冠型杨为例,按照检验样本不低于编表样本1/3的原则,将样本划分为编表样本和检验样本。选择常用的3个二元材积模型,应用For Stat2.2统计之林软件,利用最小二乘法拟合,计算模型参数。通过对模型进行评价、适用性检验,得出大冠型杨的最优二元材积模型为可变参数山本模型,其二元材积模型为:V=0.0000856338×D2.20490652-0.01979654(D+2.594343136H)×H0.430169967+0.038006277(D+0.9408300516H)利用大冠型杨的二元材积模型,编制了赤峰大冠型人工杨树二元立木材积表。

In the study artificial poplar of Chifeng area was selected for test, extracting the numbers of sample about 637. Three times standard deviation method is used to eliminate abnormal data sample 3 strains, samples divided into two forms based the on crown type, it is big type crown poplar and small type crown poplar. As an example of big type crown poplar, according to the principle of test sample is no less than making table sample 1/3, all samples were divided into test sample and making table sample. Choosing the commonly used three two-entry volume equation, Using ForStat2.2 software, fitting the volume equation by least square method, the parameter of the volume equation was calculated. By evaluating volume equation and adaptability test, the best two-entry volume equation was gotten which was the Dynamic Binary Volume Yamamoto type, as two-entry volume equation： V=0.0000856338 ×D2.20490652-0.01979654（D＋2.594343136H） ×H0.430169967＋0.038006277（D＋0.9408300516H） And the artificial poplar two-entry volume table was compiled by the two-entry volume equation of big type crown poplar in Chifeng area.