Genetic Variation and Selection of Wood Property of Alnus cremastogyne Provenance and Family Study on Wood Quality Characteristics of Populus davidiana and Its Variation of Intra-tree Genetic Variation in Basic Wood Properties of 36 Clones of Populus deltoides Effects of Fruiting Branch Position, Temperature-Light Factors and Nitrogen Rates on Cotton (Gossypium hirsutum L.) Fiber Elongation Identification of Fiber Length-Related Genes Using Cotton Oligonucleotide Microarrays Variation of Wood Basic Density and Fiber Length of Provenances of Four Eucalyptus Species Study on the Measurement of Wood Properties for Excellent Clones(New Variety)of Populus tomentosa Study on Populational Variation Tendency and Genetic Variation of Wood Quality of lnter-tree of Populus davidiana A STUDY ON REGULARITY OF THE CHANGE OF FIBER LENGTH OF WOOD IN POPLAR SHELTERBELTS AND ITS APPLICATION IN SHELTERBELT MANAGEMENT STUDY ON GENETIC VARIATION AND SELECTION OF MAIN WOOD CHARACTERISTICS AMONG PROVENANCES OF LIRIODENDRON STUDY ON FEASIBILITY OF EARLIER SELECTION OF MAIN WOOD CHARACTERISTICS IN LIRIODENDRON CHINENSE