Abstract:

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% respectivly. 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 selection methods in descent order were index selection > direct selection > indirect selection. The selection index were suitable in this experiment, which included tree height, DBH, wood specific gravity and fiber length. 4 supper clones were selected by index selection method, which were good in both growth and wood properties.

Key words: Poplar, Clone, Wood specific gravity, Fiber, Genetic variance, Index selection