Visual simulation on accumulation of the differentiating secondary wall layers
This study describes the accumulation of secondary wall layers of the fast-growing Populus×euramericana cv. ‘74 /76’ during the active phase by the methods of polarized light microscopy analysis and computer simulation technology. The results showed that the secondary wall layers of Populus×euramericana cv.‘74/76’ appeared light and shade stratification during the differentiating phase, and the wall layers corresponded to S1, S2 and S3 layer from outside to inside respectively. The S1 and S2 layer of wood fibers were differentiated in May, and the S3 layer was appeared until the July. In addition, the thickness of the three layers all showed a gradual increasing trend. The accumulation process of the secondary wall layers was visually displayed by the computational simulation technology during the active period.