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Microfibril angle (MFA) in Chinese fir was tested by X-ray diffraction apparatus and calculated by computer software. The results were as follows: MFA was controlled strongly by inheritance, and there was no significant difference in MFA among interspecies, juvenile and mature wood. In the longitudinal, MFA reduces with the height rising from 0 to 5.5 m, especially in the heights from 0 to 1.5 m. The values of MFA are nearly consistence from 1.5 to 7.5 m. The variation range was between 10.82o and 12.57o from 1.5 to 7.5 m, R2 of power equation achieved 0.932 1, and analysis of variance indicated that the variation of MFA was not significant from 1.5 to 7.5 m. The age of the trees had an important influence on MFA, consequently, the difference in MFA was significant among annual rings in radial, which was maximal in near pith and reduced rapidly from the pith to sapwood, and its decline tendency was slow beyond the ninth annual ring. MFA reached minimum value at the 15th annual ring, and the difference reached more than 20o and R2 of binomial equation achieved 0.755 6.
Microfibril angle (MFA) in Chinese fir was tested by X-ray diffraction apparatus and calculated by computer software. The results were as follows: MFA was controlled strongly by inheritance, and there was no significant difference in MFA among interspecies, juvenile and mature wood In the longitudinal, MFA reduces with the height rising from 0 to 5.5 m, especially in the heights from 0 to 1.5 m. The values of MFA are nearly consisted from 1.5 to 7.5 m. The variation range was between 10.82o and 12.57o from 1.5 to 7.5 m, R2 of power equation achieved 0.932 1, and analysis of variance indicated that the variation of MFA was not significant from 1.5 to 7.5 m. The age of the trees had an important influence on MFA, MFA was significant among annual rings in radial, which was maximal in near pith and reduced rapidly from the pith to sapwood, and its decline tendency was slow beyond the ninth annual ring. d the difference reached more than 20o and R2 of binomial equation realized 0.755 6.