Studies On Growth Patterns And Wood Properties Of The Broussonetia Papyrifera In Hypo-forest

The growth patterns, wood anatomic and wood physical and chymic character of Broussonetia papyrifera(L.) L'Heritex Vent were studied in this paper; synthesizing analyed the utilization foreground of the tree. The study contraposed the characteristics that the height of branchs under were lower and the divarications are excessive, combining the tradition use bark papermaking, tried analyzing its branch and bark fibre length and content, and compared with the wood fiber characteristics. The results showes as followeds:1 The tissue proportion and the growth ring width: The tissue proportion of Broussonetia papyrifera(L.) L'Heritex Vent were identical roughly with other broadleaf trees. The ray proportion would reduce with increase of annual ring. The fibre proportion was taken rough measurements receiving the influence of age smaller. The vessel-element proportion would rise with increase of age along radial direction.The Broussonetia papyrifera(L.) L'Heritex Vent is rapid to grow, annual ring width generally average 1.67cm of 1.06 ~2.84cm. The rapid increase outside the direction by the marrow heart first reduces to outer to 5a achieves the crest more gradually; Change and change along with the ambient conditions in external world of growth ring width then. This changes the model with generally with the material growth law in kinds of trees thorax footpath is identical.2 Wood physics and mechanical property: It generally material veins; In the structure, it is slightly even; The wood is light and soft ( the gas is done that density 0.4918g / cm~3, basic density 0.4588g / cm3, does density entirely to serve as the 0.4218 g / cm~3); In contracting futilely (the volume contracts coefficient 0.39%,'s volume futilely contracting Shuai 5.66% futilely ); It is to the utmost point low in the intensity, unsuitable(ly) the material is used as the structure. Average 32.2mpa, belongs to elementarily ( elementarily: < 35MPa ) in the same direction as lines compressive strength. Resisted turn average 5992.74Mpa, of elastic modelling quantity belongs to very elementarily, the average 70.38MPa of bending strength belongs to elementarily ( elementarily: <80mpa, middle rank: 80 ~ 120mpa ). It is easily dry, but easily sticks up the song; Not lasting long, the sapwood changes colour seriously; The cut noodles are owed smoothly saw Xie Shiyou's clamp saw appearance; Bright nature is wrong behind the...