| Variation of fiber, vessel-elements morphology, basic density, organic proportion and micro fibril angle was studied in Cinnamomum camphora. The length, width, diameter, wall thickness of fiber element and its length-width ratio, its diameter-width ration, its dual wall thickness-diameter ratio were 1000um~1166um, 24um~25um, 13um~15um, 9nm~llum, 40-45, 0.56-0.60, 0.67-0.81, respectively. The length, width, diameter, wall thickness of vessel elements were 401um~480um, 102um~135um, 97um~124um, 10ujn~12um, individually. At a given height level within trees these morphology feature values increased rapidly from pith to the 5-6 rings in radial direction and ascended slowly afterwards. But ratio of fiber lumen to diameter, ratio of fiber wall to lumen, fiber wall thickness and vessel-elements wall thickness were excepted and decreased gradually from the pith to bark. All of these morphology feature values increased from the base to the middle part of bole and then decreased to the top of tree in different ways.Significant differences were found not only in length, width, diameter, wall of fiber, and length, width, diameter of vessel-elements morphology feature values between fast-grown trees and ordinary trees (slow-grown trees). The distinct differences were also found in all morphology feature values of fiber and vessel among fast-grown trees and in all morphology feature values among ordinary trees except width of fiber and length of vessel-elements.Among morphology features of fiber and vessel elements variant range in length of fiber and vessel elements was littlest within growth rings, then in wall thickness, width, diameter at order. Variant range of fiber and vessel morphology values was larger within rings than that between rings; thevariation within trees was greater than between trees. Significant difference was demonstrated between juvenile wood and mature wood on each morphology feature value above, except diameter of fiber, wall thickness of fiber and of vessel-elements.Variation in wood basic density of man-made fast-growing and ordinary Cinnamomum camphora was described. Radial and vertical variation in extractives also studied. Basic density increased at first 5-9years rapidly and afterwards slowly at any one level from pith to bark except 0.3m height in fast-growing trees. There was a big drop at first 2-4 years and then increasing like other levels at 0.3m height in fast-growing trees. But the basice density at bark was higher than at pith. The density decreased from the base of bole to 1.3-3.3m hight and then increased in ordinary trees and increased continuously from the base to the top in fast-growing trees. Extractives was the same radial variation as the basic density at 0.3m height in fast-growing trees and the same vertical variation as the basic density of ordinary trees. Significant difference was found in density intrees, between fast-growing trees and betweem fast-growing and ordinary trees. Slight positive correlation during first years and no significant negative correlation during later years between age ring width and basic density were indicated. No significant difference was demonstrated between basic density and fiber length.The vessel-elements proportion, ray proportion, axial parenchyma proportion, fiber proportion, micro fibril angle were 14.67%, 13.30%, 11.07%, 60.87%, 14.63, respectively. At a given height level within trees, the fiber proportion and micro fibril decreased from the pith to bark. But the vessel-elements proportion and axial parenchyma proportion increased form the pith to bark. The ray proportion was special. In fast-grown camphora trees the ray proportion ascended from the pith to bark. In ordinary camphora trees the ray proportion increased from the pith to bark. The micro fibril angle increasedfrom the base to the middle part of bole and then decreased to the top of tree. The vessel-elements proportion, ray proportion and axial parenchyma proportion decreased from the base to the middle part of bole and then increased to the top of tr... |
PDF Full Text Request