In order to investigate the effect of different parts(North or South) and radial directions(Near pith or near bark) on the mechanical properties and dir-dried density of plantation wood,the mechanical properties and air-dried density of plantation-grown Castanopsis hystrix and Betula alnoides at different parts and radial directions were studied.The effect of the two factors mentioned above on the mechanical properties,air-dried density and the correlation between wood density and three main mechanical prop...