西南桦大树法选优及其增益估测的研究

Research on Selection of Superior Tree of Betula alnoides by Dominant Contrast Method and Estimation of the Corresponding Gain

以11年生西南桦人工林为研究材料,采用优树缩差与优良度回归分析方法,构建西南桦优树缩差估测方程,并探讨了西南桦优树优良度与遗传增益估算的相关关系。结果表明,西南桦优树材积缩差估测方程为Uv=1.977+0.043 KD,r=0.729,达到显著水平;经21株候选优树和105株优势木实测数据验证,平均相对误差小于10%,可在实际工作中运用。通过构建优树缩差、入选率、选择强度三维换算表,确定了西南桦选优时优树优良度下限为5%,上限为20%,其对应的入选率分别为4.0%、0.5%,遗传增益分别为10.136%、12.485%。

Using 11-year-old artificial Betula alnoides Buch.-Ham.Ex.D.Don forest as research material,the back spread estimation equation for selection of superior B.alnoides tree was established by the method of superior tree back spread and fine degrees correlation analysis.The correlation between the superiority degree of dominant contrast and the estimation of genetic gain was also discussed.The equations for estimation of the timber volume back spread of the superior B.alnoides tree was Uv=1.977+0.043 KD,r=0.729,which was significant.According to the data of 21 candidate superior trees and 105 dominant trees,the average relative error was less than 10%,thus could be used in practice.A three dimension conversion table of superior tree back spread,selection ratio and selection strength was established,in which minimum of the superiority degree was determined as 5%,the selection rare was 4.0% and the genetic gain was 10.136%;While the maximum of the superiority degree was determined as 20%,the selection rare was 0.5% and the genetic gain was 12.485%.