白花泡桐材色优良单株的选择

正泡桐(Paulownia sp.)为良好的用材林树种,其材质轻软,易加工和干燥,尺寸稳定性好,很少开裂和变形,材质浅白,且有独特的丝绢光泽,但其缺点是生材锯解后,在存放、加工和使用过程中,其表面经常出现深褐色或黑褐色色斑,严重损害了成材和制品的外观质量,对其经济价值会造成很大影响[1-3]。因此,对其材色性状进行改善,对于提高桐材产品质量具有重要意义。

Selection of Excellent Wood Color Paulownia fortunei Individuals

Paulownia wood is of great quality, but the wood stain is easily occurred after sawing. 29 Paulownia fortunei trees which have excellent growing properties were selected by properties of wood color, 5 indexes were used to compare and analyze the wood color, including psychometric lightness, red degree, yellow degree, color difference and Hunter whiteness. The result shows that the differences of each index among individuals reach to an extremely significant level. It is concluded that certain potentiality exists in excellent selection from individuals. The Cluster analysis of all individuals with the 5 indexes was did by median method, 5 individuals which prior clustered together: superior fortunei 4, superior fortunei 25, superior fortunei 5, superior fortunei 3 and superior fortunei 2 were selected, the selection rate is 17.24%. The Hunter whiteness and psychometric lightness values of individuals selected were significantly higher than other clusters, the color difference were significantly lower than other clusters, the red degree and yellow degree were in the middle, the average Hunter whiteness values of individuals selected reached to 75.060, the selection differential was 3.818, selection intensity was 1.297. These individuals have excellent color properties, superior stem form and no disease, can be widely applied in the production.