Variation of swelling and water absorption in 10-year-old Eucalyptus Clones wood

To study the dry shrinkage and wet swelling properties of large diameter wood of Eucalyptus, and to provide material property data for the utilization of solid wood. The six 10-year-old E. clones were used as test materials, the swelling and water absorption of wood were measured by drying and moisture absorption methods, and the variation rules and the correlation clones, individual plants and trunk height were analyzed.Results showed that the different clones and trunk height parts were significant differences, the woodtangential and radial swelling and volume swelling rate among different clones and plantswere highly significant differences.but no significant effect on radial swelling rate. Among the six clones, No. 11 and No. 3 had the highest water absorption, while No. 14 had the lowest water absorption. Correlation analysis showed that the index of swelling was moderate to highly positively correlation, and the correlation between swelling and water absorption was not high, so the two traits could be selected independently in the breeding of E. clones.