GENETIC VARIATION IN GROWTH AND WOOD PROPERTIES AND MULTIPLE-TRAITS SELECTION OF POPLAR CLONES

The inheritances and correlations between growth characters and wood quality characters were studied with the data of 25 Popuar clones, which had been growing for 7 years.The significent differences among these clones were found in fiber length,fiber width,ratio of length to width,wood specific gravity,tree height and DBH.They were moderately or intensively inherited in 6 characters of growth and wood properties.The broad heritabilities were calculated by fiber length, fiber width,ratio of length to width and wood specific gravity, tree height and DBH, which were 81.9%,73.3%,70.52%,64.3%, 68.8%,70.54% respectiviy.High genetic positive correlations were found between tree height and DBH,between fiber length and ratio of length to wodth, between wood specific gravity and DBH.The effectiveness of different selecation methods in descent order were index selectiondirect selectionindirect selection.The selection index were suitable in this experiment,which included tree height, DBH, wood specificgravity and fiber length.4supper.clones were selected by index selection method,which were good in both growth and wood properties.