Study On Inheritance And Variation In Growth And Wood Properties Of Populus Tomentosa Clones

Combining the observed data of growth traits over the years, this paper measured 12 years 11 Populus tomentosa clones wood properties, including fiber length, fiber width, length width ratio, fiber radius, double wall thickness, wall lumen ratio, basic density, Cellulose content. The difference and radial variation of 11 clones wood properties were systematically studied. The results showed: ① There are very significant differences in DBH, height and volume of 11 tested clones ,broad sense heritability respectively is 0.8189, 0.8716 and 0.8143 , which indicates the three traits are controlled by the strong genetic factor . ② The difference of fiber length of 11 tested clones is significant, the Max. and the Min. are 0.9209 mm and 1.0556 mm. They reach the medium-sized length standard. The frequency distribution of fiber length and width accords with the demands for paper-making raw materials. ③ The regression model of fiber length in radial direction and tree age is Y=aX~2+bX+c, which has important function in instructing producing. ④ The Max. in fiber length of 11 tested clones and the Min. are 0.9209 mm and 1.0556 mm, broad sense heritability is 0.9290;the radial variation of wood basic density belongs to the pattern of "increase-level off. ⑤ Basic density has significant positive correlation with DBH and volume, which indicates wood basic density can improve by fostering the large DBH wood. ⑥ Growth traits and wood properties of 11 clones were evaluated. Considered wood yield and paper-making suitability, 11 , 206, 12 , 68 , 328and 337 should be selected. The 6 clones which superior to 37 clone (CK) are worth popularizing in the industrial materials.