Comparison of Growth and Main Wood Properties Between Eucalyptus cloeziana and Eucalyptus torelliana

In 2014,12-year-old Eucalyptus cloeziana and Eucalyptus torelliana plantations in Zhangzhou,Fujian Province were selected as the research objects,and their biomass,productivity,wood physical and mechanical properties,and stem shape curves were studied to provide a reference for the scientific management and rational use of wood from E.cloeziana and E.torelliana.The results showed that the average DBH of E.cloeziana was 1.4 times that of E.torelliana,the average tree height of E.cloeziana was 1.39 times that of E.torelliana,the average individual volume of E.cloeziana was 2.56 times that of E.torelliana,and the wood volume per unit area of E.cloeziana was 1.43 times that of E.torelliana.The air-dried wood densities of E.cloeziana and E.torelliana were 0.78 g·cm^-3 and 0.58 g·cm^-3,respectively.The dry shrinkage rates of E.cloeziana wood under full drying and air drying were 15.9% and 9.9%,respectively.The dry shrinkage rates of E.torelliana wood under full drying and air drying were 14.4% and 9.7%,respectively.The swelling ratios of E.cloeziana were 7.2% and 19% at air-drying and after water absorption,respectively.The swelling ratios of E.torelliana were 5.5% and 16.9% at air-drying and after water absorption,respectively.Based on the growth of E.cloeziana and E.torelliana and the density,shrinkage and swelling of wood,it can be seen that the growth and material of E.cloeziana are generally better than that of E.torelliana.The results show that the material of E.cloeziana is fine and hard,the compressive strength parallel to the grain is 67.8 MPa,and the bending strength is 135.9 MPa,which is higher than the compressive strength parallel to the grain and the bending strength of E.torelliana.It shows that E.cloeziana is an excellent material for making furniture,handicrafts,musical instruments and other uses.