COMPUTER-AIDED IDENTIFICATION FOR CHINESE HARD-WOODS Study on Populational Variation Tendency and Genetic Variation of Wood Quality of lnter-tree of Populus davidiana Effects of Crown Attr ibutes onWood Character isticsand Increments of Popu lus ×xiaohe i STUDIES ON WOOD CHARACTERISTICS AND THEIR FREQUENCIES OF OCCURRENCE IN SOME IMPORTANT CHINESE WOOD SPECIES STUDY ON GENETIC VARIATION AND SELECTION OF MAIN WOOD CHARACTERISTICS AMONG PROVENANCES OF LIRIODENDRON Variation in Wood Characteristics and Rotatlon Age of Loblolly Pine for Pulpwood