TAILIEUCHUNG - Báo cáo lâm nghiệp: "Efficiency of early selection for rotation-aged wood quality traits in radiata pine"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Efficiency of early selection for rotation-aged wood quality traits in radiata pine. | Ann. For. Sci. 64 2007 1-9 INRA EDP Sciences 2007 DOI forest 2006082 1 Original article Efficiency of early selection for rotation-aged wood quality traits in radiata pine Harry X. Wua Mike B. POWELLc Junli L. YANGb Milo IVKOVlCa Tony A. McRaec aEnsis CSIRO PO Box E4008 Kingston ACT 2604 Australia b Ensis CSIRO Private Bag 10 Clayton South VIC 3169 Australia c Southern Tree Breeding Association Inc PO Box 1811 Mount Gambier SA 5290 Australia Received 6 December 2005 accepted 19 June 2006 Abstract - A total of 360 bark-to-bark-through-pith wood strips were sampled at breast height from 180 trees in 30 open-pollinated families from two rotation-aged genetic trials to study inheritance age-age genetic correlation and early selection efficiency for wood quality traits in radiata pine. Wood strips were evaluated by SilviScan and annual pattern and genetic parameters for growth wood density microfibril angle MFA and stiffness modulus of elasticity MOE for early to rotation ages were estimated. Annual ring growth was the largest between ages 2-5 years from pith and decreased linearly to ages 9-10. Annual growth was similar and consistent at later ages. Wood density was the lowest near the pith increased steadily to age 11-15 years then was relatively stable after these ages. MFA was highest 35 near the pith and reduced to about 10 at age 10-15 years. MFA was almost unchanged at later ages. MOE increased from about GPa near the pith to about 20 GPa at ages 11-15 years. MOE was relatively unchanged at later ages. Wood density and MOE were inversely related to MFA. Heritability increased from zero near the pith and stabilised at ages 4 or 5 for all four growth and wood quality traits DBH density MFA and MOE . Across age classes heritability was the highest for area-weighted density and MFA lowest for DBH and intermediate for MOE. Age-age genetic correlations were high for the four traits studied. The genetic correlation reached after age 7 for most traits. .

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