THE SELECTION BREEDING OF EXCELLENT CLONES OF POPULUS TOMENTOSA——AN EVALUATION OF PRODUCTIVITY, GENETIC STABILITY AND ADAPTABILITY

A system analysis was made on the successive eight-year growth data of site experiments on clones of Populus tcmentosa, and the evaluation of productivity, genetic stability and adaptability was conducted. There were 5 faster growing clones,3 of which had higher genetic stability and adaptability and were adapted to be cultivated in two ecological areas. Two clones and the controlled clone were genetically less stable, which were only suitable to be extended in limited areas owing to their special adaptability. According to the multiple ranging analysis, the 11 evaluating parameters could appropriately be incorporated into 3 catalogues which were independent to each other and had the same effectiveness in evaluating the productivity,genetic stability and adaptability. For effectiveness and computing conveniences, either one of the following parameter groups is recommended to be adopted in evaluating: