摘要
为快速准确地掌握广西桉树林的生长过程及林木蓄积量生长潜力,采用临时标准地年龄序列法,选择立地条件、经营水平、林分密度均中等的标准地调查数据并建立各年龄序列的现实林分胸径、蓄积量的生长量和生长率序列数据,分别拟合得到以年龄为自变量的一元林分蓄积量生长率模型Y=735.81016×A^(-2.10757)和以林分平均胸径、年龄为自变量的二元林分蓄积量生长率模型Y=36965.39174×(D^(2.122)×A)^(-1.05841)。整体检验结果表明:一元林分蓄积量生长率模型总相对误差(TRE)小于2%,平均系统误差(ASE)小于5%,平均百分标准误差(MPSE)小于7%,预估精度P达到97%以上;二元林分蓄积量生长率模型TRE、ASE绝对值小于1%,MPSE小于6%,预估精度P达到97.5%以上;一元、二元林分蓄积量生长率模型各项指标均满足编制林业数表技术规程的精度要求,二元林分蓄积量生长率模型各项指标整体优于一元林分蓄积量生长率模型。利用一元、二元林分蓄积量生长率模型制定一元、二元林分蓄积量生长率表,为森林资源资产清查、森林采伐限额测算和开展采伐迹地原有林木蓄积量和出材量调查等工作提供科学方法,降低调查工作劳动强度和生产成本。
To rapidly and accurately understand the growth process and volume growth potential of Eucalyptus plantations in Guangxi,this study employed the temporary sample plot age sequence method.Plot data with medium site conditions,medium management levels,and medium stand densities were selected to establish realistic forest stand diameter,growth volume and growth rate sequence data at breast height(DBH).Two models were fitted:a univariate stand growth rate model with age as the independent variable Y=735.81016×A^(-2.10757),and a bivariate stand volume growth rate model with average stand at DBH and age as independent variables Y=36965.39174×(D^(2.122)×A)^(-1.05841).The results showed that for the univariate model,the total relative error(TRE)was less than 2%,the average systematic error(ASE)was less than 5%,the mean percentage standard error(MPSE)was less than 7%,and the prediction accuracy(P)exceeded 97%.For the bivariate model,the absolute values of TRE and ASE were less than 1%,MPSE was less than 6%,and P exceeded 97.5%.Both the univariate and bivariate stand volume growth rate models met the accuracy requirements of various indicators in the technical regulations for the preparation of forestry yield tables.The bivaniate stand volume growth rate model generally outperformed the univariate stand volume growth rate model on all indicators.Using these models,univariate and bivariate stand volume growth rate tables were developed.This study provided scientific methods and calculation models for forest resource asset inventory,forest harvesting quota calculations,and surveys of original stand volume and timber yield in harvested areas to greatly reduce the labor intensity and production costs of survey work.
作者
徐庆玲
李丽娟
杨承伶
韦素怀
韩斐扬
谢素平
XU Qingling;LI Lijuan;YANG Chengling;WEI Suhuai;HAN Feiyang;XIESuping(Guangxi Forest Inventory&Planning Institute,Nanning 530011,Guangxi,China;Guangxi Zhengque Intelligent Technology Co.,Ltd.,Nanning530002,Guangxi,China)
出处
《桉树科技》
2025年第1期23-29,共7页
Eucalypt Science & Technology
基金
广西林业科研项目(桂林科研〔2016〕31号,桂林科研〔2016〕24号,桂林科研〔2015〕15号)。
关键词
桉树
林分蓄积量
生长率
林分平均胸径
Eucalyptus
stand volume
growth rate
average stand diameter at breast height
