速丰桉人工林材种出材率表编制  

Study on Wood Yield Table of Fast-growing and High-yield Eucalypt Plantations

作　　者：徐庆玲 吴国欣 莫祝坤 张伟 岑巨延 刘峰 XU Qingling;WU Guoxin;MO Zhukun;ZHANG Wei;CEN Juyan;LIU Feng(Guangxi Forest Inventory&Planning Institute,Nanning 530011,Guangxi,China;GuangxiState-ownedGaofengForest Farm,Nanning 530001,Guangxi,China)

机构地区：[1]广西林业勘测设计院,广西南宁530011 [2]广西国有高峰林场,广西南宁530001

出　　处：《桉树科技》2023年第3期11-18,共8页Eucalypt Science & Technology

基　　金：广西林业科研项目(桂林科研[2016]24号);广西林业科研项目(桂林科研[2015]28号)。

摘　　要：以尾叶桉和巨尾桉为对象,采用198株伐倒木样木数据分径阶形成建模数据,对比修正决定系数、总相对误差、平均系统误差、平均百分标准误差及预估精度指标,选定最优带(去)皮削度方程为d/D=[(H-h)/(H-1.3)]^((c_(0)+c_(1)Z^(0.25)+c_(2)Z^(0.5)+c_(2)Z^(0.5)+c_(3)(D/H)));应用树高曲线(h=c_(1)×(1-e^(-c_(3)×D)^(c^(2))))、树皮率方程(Pv=c_(1)+c_(2) × lnD)计算机理论造材,结合广西速丰桉木材市场计量实际需求,按2.6 m材长规格,分别编制尾叶桉和巨尾桉胸径树高二元经济材出材率表,精度达到了林业数表模型编制要求,可广泛适用于广西速丰桉伐区调查、森林资产评估等生产实践。Taking Eucalyptus urophylla and E.grandis×E.urophylla as study objects,data of 198 trees were used for modellingdiameter hierarchies,with the modified determination coefficient,total relative error,average systematic error,average percentage standard error and prediction accuracy indices being compared.From this data,the optimal debarking degree equation of(d/D=[(H-h)/(H-1.3)]^((c_(0)+c_(1)Z^(0.25)+c_(2)Z^(0.5)+c_(2)Z^(0.5)+c_(3)(D/H)))was selected,and a tree height curve(h=c_(1)×(1-e^(-c_(3)×D)^(c^(2))))and bark rate equation(Pv=c_(1)+c_(2)×lnD)were developed.When combined with the actual demands of Guangxi fast-growingeucalypttimber market and based on a wood length specification of 2.6m,tree-height binary economic timber yield tables for these eucalypt varieties were compiled.These yield tables were found to meet the precision requirements of forest table model compilationand could be widely applied to investigations of fast-growing and high-yield eucalyptplantation harvests and forest asset evaluations in Guangxi.

关 键 词：速丰桉 削度方程 树皮率 出材率表 

分 类 号：S757.47[农业科学—森林经理学]