Comparative Study On Wood Properities Of Alnus Cremastogyne Burkill And Aluns Formosana Makino

This paper studies on the wood structure, wood anatomical feature, physical and mechanical properties of three 9-year-old Alnus cremastogyne Burkill trees and three 9-year-old Aluns formosana Makino trees, and further comparing each function of these two species. The results are as follows:(1) Both macroscopic and microcosmic structure of these two species are alike, slight differences only existed in the number of porous and bars of vessel perforation plates.(2) Compare the fiber figure of two species annually and indicates: fiber length and width of Alnus cremastogyne Burkill are longer than Aluns formosana Makino's annually; Alnus cremastogyne Burkill's wall thickness and the ratio of double wall thickness to lumen are smaller than Aluns formosana Makino's annually; the ratio of fiber length to width are depends according to different growth rings. Radial variation of fiber figure of two species are same.(3)Compare the vessel figure of two species annually and indicates: Alnus cremastogyne Burkill's vessel length is longer than Aluns formosana Makino's annually, but its vessel width is shorter than Aluns formosana Makino's of each growth rings only left the first growth ring. Radial variation of vessel figure of two species are same.(4) The degree of evolution of two species' vessels are almost the same, both of them work as little bit original.(5) Compare the microfibrillar angle of two species annually and indicates: Alnus cremastogyne Burkill's microfibrillar angle are samller than Aluns formosana Makino's annually. According to the radial variation, microfibrillar angle of both species delined annually when growth rings increased annually.(6)Compare the crystallinity of two species annually and indicates: Alnus cremastogyne Burkill's crystallinity are bigger than Aluns formosana Makino's of each growth rings. According to the radial variation, crystallinity of both species increased annually when growth rings increased annually.(7) There is no huge differences between two species'physical and mechanical properties, but both of their mechanical properties are smaller than other species from same genus because they are still juvenile wood.