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《Journal of Anhui Agricultural Sciences》 2009-05
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Study on the Radial Variations of Growth Ring Width,Air-dried Wood Density and Fiber Length of Toona sinensis(A.Juss.)Roem.and Their Relativity

ZHANG You-yuan et al (College of Forestry,Guizhou University,Guiyang,Guizhou 550025)  
[Objective] The research aimed to study the radial variations of growth ring width,air-dried wood density and fiber length of Toona sinensis(A.Juss.)Roem.and their relativity.[Method] The growth ring width air-dried,wood density and fiber length were determined by the growth ring timber character analysis theory.The models of the growth ring width air-dried,wood density and fiber length by tree ages were fitted by SPSS 13.0.[Result] The results showed that the average growth ring width of 32 year old Toona sinensis(A.Juss.)Roem.was 1.382 cm,and the maximum was at 9th year,it was 2.217 cm.The growth ring width began stabilization at 21th-31th year,ranged from 0.683 cm to 1.000 cm.The air-dried wood density and fiber length of Toona sinensis(A.Juss.)Roem.added by the increase of tree age.The average air-dried wood density was 0.475 g/cm3,at 17th year it was 0.543 g/cm3,then it went to stabilization,ranged from 0.507 g/cm3 to 0.564 g/cm3.The fibre length was 797.84-1 396.34 μm,and the radial variation type belonged to Panshin Ⅰ.The correlativity between the growth ring width,air-dried wood density,fiber length and the tree ages of Toona sinensis(A.Juss.)Roem.was prominent(P0.01),and the growth ring width,the air-dried wood density and the fiber length of Toona sinensis(A.Juss.)Roem.had prominent correlativity each other(P0.01).The results of swath clustering showed that the boundary lined of juvenile wood and maturate wood were 13th-15th year.[Conclusion] The study provided the theoretical basis for the fast growing and high yield, directive breeding,wood improvement,silviculture technique and the processing and utilization of wood of Toona sinensis(A.Juss.)Roem.plantation.
【Fund】: 贵州省林业厅林业科技项目
【CateGory Index】: S792
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