Genotypic variation in wood properties and growth traits of <Emphasis Type="Italic">Eucalyptus</Emphasis> hybrid clones in southern China |
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Authors: | Shijun Wu Jianmin Xu Guangyou Li Vuokko Risto Zhihu Du Zhaohua Lu Baoqi Li Wei Wang |
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Institution: | (1) Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangdong Guangzhou, 510520, China;(2) Guangxi StoraEnso Forestry Corporation Ltd., Nanning, Guangxi, 530022, China |
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Abstract: | Growth traits, wood properties and bark percentage were assessed for 19 hybrid eucalypt clones at three sites in southern
China sampled at age 51 months. Analysis of variance showed that there were significant differences in growth traits and wood
properties between clones and sites, and that the clone × site interactions were also significant except for basic density.
Coefficients of variation ranged from 8.4 to 27.9% for growth traits, 2.7–11.1% for wood properties and 14.0–23.3% for bark
percentage. Repeatability ranged from 0.73 to 0.96 for growth traits, 0.32–0.93 for wood properties and 0.77–0.88 for bark
percentage. Strong genotypic correlations between the same traits in clones at pairs of sites indicated that the traits were
rather stable across sites. The genotypic correlations between growth traits and basic density ranged from −0.67 to 0.43,
and generally favorable negative genotypic correlations between growth traits and bark percentage were also found. The correlations
between growth traits and Pilodyn pin penetration were positive, ranging from 0.28 to 0.65 and therefore unfavorable as lower
wood density will be associated with higher values of Pilodyn pin penetration and improved growth rate. The correlations between
traits assessed using non-destructive field methods and wood property assessment results indicated that Pilodyn and Fakopp
microsecond timer tools can be confidently used to indirectly select for fiber width and basic density. |
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