Variation Analysis on the Main Economic Characters of Chinese Fir Clones

272 ten years old of Chinese fir clones at Longshan farm, Lechang city of Guangdong provenance, 4 phenotypic traits including tree height, diameter at breast height, bark thick, volume of timber, 2 wood property characteristics including the heartwood ratio and density of wood were investigated. The results showed that there were abundant phenotypic variation in 272 clones. The phenotypic variation coefficient were all above 10%, of which, volume of timbre's was the biggest. The volume ranged from 00038m3 to 04791m3 with the phenotypic and genetic variation coefficient was 6904% and 7397%, respectively. Very significant difference among clones of 6 measured traits and there were all variance component in clones which suggested a genetic control of them. Further study found that the variation tendency of genetic variation coefficient followed the phenotypic variation coefficient. The density presented the lowest genetic variation coefficient of 1303%, while had a relative high repeatability value (0684 3) and only the heartwood ratio was lower than 05. All the measured traits, the absolute genetic gain increased under lower selection ratio (10%, 20%, 30% and 50%). Among the 6 phenotypic traits, 4 growth traits showed a significant relation between each other and all were significantly negative correlation related to wood basic density.