Stress-Strain Constitutive Relations of Longitudinal Compressed Elm Wood with Compound Alkali Liquor Processing The Chemical Groups and Bonds Characterization of Juvenile Wood and Mature Wood Lignins of Chinese Fir Mechanical Models of Larix gmelinii Mature Clear Wood Based on the Properties of Earlywood and Latewood: Longitudinal Modulus of Elastic COMPARATIVE STUDIES ON WOOD PROPERTIES OF JUVENILE VS. MATURE WOOD AND PLANTATION VS. NATUREAL FOREST OF MAIN PLANTATION TREE SPECIES IN CHENA Prediction of Mature Wood Anatomical Properties of Pinus banksiana Plantation Based on Support Vector Machines (SVM) Variations in Wood Properties of Masson Pine (Pinus massoniana L.) Plantation Comparison on the Pulping Property between Juvenile and Mature Wood of Populus simonii×P.nigra