Molecular Cloning and expression analysis of 3 hydroxy 3 methylglutaryl CoA Reductase Gene from Eucalyptus urophylla×E.grandis Leaf Litter Decomposition and Its Relationship with Soil Properties in Betula alnoides and Eucalyptus urophylla × E. grandis Allelopathic Sensitivity of Five Economic Species to Aqueous Leaf Extract of Eucalyptus urophylla×E. grandis with Different Ages Effects of continuous cropping on the carbon storage of Eucalyptus urophylla×E. grandis short\|rotations plantations Coupling Relationships between Soil Microbe and Soil Nutrient in Eucalyptus urophylla×E.grandis Plantation at Different Stand Ages GENETIC VARIATION IN GROWTH AND WOOD PROPERTIES OF F1 PROGENIES OF EUCALYPTUS UROPHYLLA ×E.GRANDIS Analysis of volatile constituents of different years old of E.grandis×E.urophylla leaf by GC-MS Biomass and its allocation characteristics of Eucalyptus urophylla × E. grandis 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 Carbon Storage and Its Distribution in Eucalyptus urophylla×E.grandis Plantations at Different Stand Ages