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A PRIMARY STUDY ON THE RADIAL VARIATION PATTERNS OF WOOD PROPERTIES WITHIN TREES V.THE RADIAL VARIATION PATTERNS AND ITS VARIATION OF WOOD FIBRE LENGTH OF 15 CLONES OF POPULUS×EURAMERICHANA RESEARCH ON WOOD PROPERTIES IMPROVEMENT V. GENETIC PARAMETER ESTIMATES FOR RING DENSITY COMPONENT TRAITS OF NEW CLONES IN POPULUS DELTOIDES×P.SIMONII