Allelopathic Sensitivity of Five Economic Species to Aqueous Leaf Extract of Eucalyptus urophylla×E. grandis with Different Ages Study on Clear Painting Properties for Three Eucalyptus Plantation Woods from the Chromatic Parameters Biomass- and energy allocation in Eucalyptus urophylla×Eucalyptus tereticornis plantations at different stand ages. Measurement of Longitudinal Surface Growth Strains of Trees Using Strain Gauge and CIRAD-Foret Method Molecular Cloning and Prokaryotic Expression of the Gene Encoding HMG-CoA Reductase from Eucalyptus urophylla×E.grandis Influences of Temperatures,pH Values and Inoculum Concentrations on the Adsorption and Ingression of Ralstonia solanacearum to Eucalyptus urophylla× E. grandis Seedling Root Carbon Storage and Its Distribution of Eucalyptus urophylla × E.tereticornis Plantations in Hainan Island, Southern China