| Camphora trees’trunk and branch are studied in this research, including four questions followed:the differences of wood property among tension wood, opposite wood and normal wood; the differences of wood property between different angles of trunk and branch; the differences of wood property between trunk and branch; the last questions was the differences of anatomical characters. It will prove the scientific information for the utilization of camphora trees’trunk and branch, and achieve its maximum value. The main results are as following:1. The results of the the tension wood property and the differences among tension wood, opposite wood and transition wood:the fiber length, fiber width, fiber diameter, fiber wall thickness, fiber length/width ratio, vessel-elements length, vessel-elements width, vessel-elements wall thickness, vessel-elements diameter and microfibril angle of normal wood was the largest. Fiber proportion and Ray proportion of normal wood are largest, tension wood was the least. Vessel-elements proportion of tension wood was the largest, opposite wood was the least. Axial parenchyma proportion of tension wood was the largest, normal wood was the least. The variance analysis indicated there were significant differences in fiber length, fiber wall thickness, fiber length/width ratio, vessel-elements length, vessel-elements width, vessel-elements diameter and microfibril angle. The difference was significant at the level of 0.05.The basic density of normal wood was the least, the opposite wood was the largest. The longitudinal all drying shrinkage of tension wood was the largest, normal wood was the least. The radial all drying shrinkage and tangential all drying shrinkage of opposite wood was the largest, normal wood was the least. The ratio of tangential shrinkage to radial all drying shrinkage of tension wood was the largest, opposite wood was the least. The longitudinal and radial air-dry drying shrinkage of opposite wood was the largest, normal wood was the least. The tangential air-dry drying shrinkage of opposite wood was the largest, tension wood was the least.The cellulose content of tension wood was the most in the three areas, opposite wood was the least. The lignin content of opposite wood was the most, the tension wood was the least. The benzene alcohol extraction content of normal wood was the most, the tension wood was the least. The extraction content of opposite was the most, the normal wood was the least.In camphora trees, G-layer fibers was exist typically. There are three types of distribution could be distinguished:all the fibers were gelatinous and normal fibers were scarce; fiber with a G-layer were diffuse, or occurred in clusters; finally, G-layer fibers were isolated and sparse.2. The results of the differences of anatomic characteristics and basic density between camphora trees’tension wood in different angles:The difference in fiber length, fiber length/width ratio, vessel-elements length, ray proportion, axial parenchyma proportion and microfibril angle was significant at the level of 0.01. The difference in fiber diameter, fiber wall/lumen, fiber lumen/diameter, vessel-elements width was significant at the level of 0.05. The other features was non-significant. In the correlation analysis between angle and fibre morphology, there ia significantly negative correlation between fiber length, fiber diameter, fiber length/width ratio and angle. The differences of basic density was significant at the level of 0.05 in the four samples.3. The results of the differences of wood property between camphora branches’ tension wood in different angles:the correlation analysis between angle and eccentricity ratio is non-significant. The differences of fiber length, fiber width, fiber diameter, fiber wall thickness, fiber length/width ratio, fiber wall/lumen, fiber lumen/diameter was significant at the level of 0.01. But in the correlation analysis between angle and fiber morphology, the correlation was significant only in fiber diameter, fiber length/width ratio and fiber wall/lumen. The differences of vessel-elements width, vessel-elements wall thickness, vessel-elements diameter, ray proportion, axial parenchyma proportion was significant at the level of 0.01. The differences of fiber proportion was significant at the level of 0.05. The differences of vessel-elements proportion was non-significant.The differences of basic density, cellulose content, lignin content, benzene alcohol extraction content was non-significant, only the differences of the content of extraction was significant an the level of 0.01.4. The results of differences of wood property between trunk and branch:The fiber length of trunk was 10 percent larger than branch, the fiber width was 13 percent larger, the fiber diameter was 19 percent larger, the fiber wall thickness was 8 percent larger, the fiber length/width ratio was 6 percent larger, the fiber lumen/diameter was nearly as branch. The differences of fiber length, fiber width, fiber lumen/diameter, fiber length/width ratio was significant at the level of 0.05. The differences of fiber diameter, fiber wall thickness, fiber wall/lumen was significant at the level of 0.01.The vessel-elements length of trunk was 12 percent larger than branch, the vessel-elements width was 34 percent larger, the vessel-elements diameter was 41 percent larger, the vessel-elements wall thickness was 23 percent larger. The differences of vessel-elements length, vessel-elements width, vessel-elements diameter was significant at the level of 0.01. The differences of vessel-elements wall thickness was non-signifi-cant.The fiber proportion of trunk was 2 percent less than branch, the vessel-elements proportion was 6 percent larger, the ray proportion was 2 percent less, the axial parenchyma proportion was 4 percent larger. The differences of organization proportion between trunk and branch was non-significant. The averge microfibril angle of trunk was 16.7°, the branch was 20.9°, the trunk was 25 percent less than the branch. The differences of microfibril was significant at the level of 0.01.The basic density of branch was 6 times more than trunk. The differences was significant at the level of 0.01. The longitudinal air-dry drying shrinkage of trunk was 2 times more than branch; the radial air-dry drying shrinkage was 24 percent more than branch; the tangential air-dry drying shrinkage was 22 percent more than branch. The longitudinal all drying shrinkage of trunk was 2 times more than branch; the radial all drying shrinkage was 33 percent more than branch; the tangential all drying shrinkage was 20 percent more than branch.The cellulose content of trunk was 18 percent more than branch, the lignin extraction content was 4 percent more, the benzene alcohol extraction was 33 percent more, the extraction content was 19 percent more. The differences of cellulose was significant at the level of 0.01, the differences of lignin and extraction content was significant at the level of 0.05, the differences of benzene alcohol extraction content was non-significant.5.The special structure of camphora trees’branch:The narrow side corresponds to tension wood and the wider side corresponds to opposite wood from the microstructure of the special branch.But we came to a contrary conclusion from the anatomical properties. |
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