Pilodyn在毛白杨材性指标的预测及选择中的应用

Research on the application Pilodyn in assessing wood traits and selection of Populus tomentosa

为了快速预测毛白杨的木材密度，研究毛白杨木材密度和生长量的遗传变异特征，对毛白杨进行有效的选择，利用胸径，Pilodyn探测值，及与部分Pilodyn探测值对应的实测木材密度进行了研究．研究结果表明，各无性系胸径的平均值为18．13—24．23cm，变异系数为9．77％；各无性系Pilodyn探测值的平均值为15．22—20．22mm，变异系数为6．55％；Pilodyn探测值和木材外部密度及木材基本密度之间的相关系数分别为-0．667和-0．561；Pilodyn探测值预测2个指标的方程分别为Y=-0．013x＋0．6187（R^2=0．3936）和Y=-0．0059x＋0．4745（R^2=0．2077），2个方程的预估精度分别为98．14％和98．32％．方差分析的结果为毛白杨胸径和Pilodyn探测值在无性系间均存在极显著差异，胸径和Pilodyn探测值的无性系重复力分别为0，657和0．614，单株重复力分别为0．268和0．250，材积和Pilodyn探测值对毛白杨生物量的贡献率分别为90．56％和9．44％，根据生物量的大小，选择出346，206，11，12，68，384共6个生物量最大的无性系．

In order to assess wood density quickly of Populus tomentosa, the genetic variation of Populus tomentosa on diameter at breast height（DBH） and wood density, and select good clones of Populus tomentosa,the article tested the DBH,Pilodyn penetration （Ps）and a part of wood density（Ds） or outerwood density （Dso） one-to-one for Pilodyn of the 28 clones of Populus tomentosa. The results showed that The mean of DBH of every clone was 18.13 -24.23 cm, the coefficient of variation （ CV ） was 9.77% ; the mean of Pilodyn penetration of every clone was 15.22 - 20.22 ram, the coefficient of variation was 6.55% ;the correlation coefficients between Pilodyn penetration, outerwood density and wood density were -0. 667 and -0. 561 respectively; the linear regression equation between the outerwood density and Pilodyn penetration was y = -0. 001 3x ＋0. 618 7（R^2 =0. 393 6） ;and the linear regression equation between the wood density and Pilodyn penetration was y = - 0. 005 9x ＋ 0. 474 5 ; the estimation precision of the equation was 0.984 6 and 0. 985 9 respectively. The result of the ANOVA analysis also showed there was the remarkable difference in Ps and DBH among the clones. The clones repeatability of DBH and Pilodyn penetration were 0. 657 and 0. 614 respectively, the single repeatability were 0. 268 and 0. 250 respectively, the contribution rate of DBH and Pilodyn penetration to the biomass was 90.56% and 9.44% respectively. According to the biomass we selected 6 bigger biomass clones which were 11, 12, 68,206, 337 and 384.