应力波法快速预测3个家系落叶松木材弹性模量OA

To enable rapid prediction of the modulus of elasticity(MOE)in hybrid larch wood,three hybrid larch families(Larix kaempferi 3×Larix gmelinii 2,L.kaempferi 12×L.gmelinii 9,and L.kaempferi 3×L.gmelinii 9)were selected.Stress-wave nondestructive testing technology was employed to measure stress-wave velocity in logs and small clear specimens.The dynamic modulus of elasticity was calculated based on stress-wave velocity in combination with oven-dry density.The differences in stress-wave velocity and dynamic MOE between two forms of wood,namely logs and small clear specimens,were investigated,and the differences between the dynamic MOE and static MOE of small clear specimens were also compared.The results showed that,compared with logs,the stress-wave velocity and dynamic MOE of small clear specimens increased by 6.1%and 8.4%,respectively.The static MOE was 30.2%and 20.1%higher than the dynamic MOE of logs and small clear specimens,respectively.The full-sample regression models developed using log wave velocity and log dynamic MOE to predict the static MOE of small clear specimens yielded coefficients of determination(R²)of 0.57 and 0.66,respectively.A full-sample multiple regression model of small clear specimens incorporating both log wave velocity and air-dry density yielded R² of 0.67,and five-fold cross-validation indicated that the model exhibited good stability.All models demonstrated moderate fitting level and promising predictive potential.Across different families,the Larix kaempferi 3×L.gmelinii 2 family showed all the best fit.This study provides a theoretical basis and technical support for rapid evaluation of MOE in hybrid larch wood.