Abstract:

This article studies the relationship among Pilodyn penetration, wood basic density and wood fiber property based on 79 Larix kaempferi in order to provide indirect estimate index of the wood property genetic improvement of Larix kaempferi. The result shows that there is remarkable difference among Pilodyn penetration, wood basic density and wood property on south and north directions. The Pilodyn penetration has significant negative correlation（-0.454--0.587）with the wood basic density in the same direction，the same with the late wood fiber property（-0.329--0.447）, but has common negative correlation with the early wood fiber property（-0.015--0.137）. We set up a path graphics between Pilodyn penetration and other wood indexes and get the new model which is retrenched from the old model and keeps 85% information. In the new model，the wood density contribution is 46.71%, the growth contribution is 24.47% and the rest is the late wood fiber length, 28.82%. We constitute linear regression equation of Pilodyn penetration and the wood density，the result shows that the coefficient of determination of south directions (0.425 3) is higher than north directions（0.209）and the estimation precision of linear regression equation in south is 98.05％, in north is 97.80％, which means that it is feasible and dependable to estimate the wood density of Larix kaempferi with the upper model.

Key words: Larix kaempferi, Pilodyn, basic wood density, fiber property, path analysis, estimation precision