Study on the Growth Character Correlation of Chinese Fir Clone and Early Selection

The growth of 2 clonal plantation(7 and 10 years old) were measured and analyzed. The results showed that the F values of height and diameter increment, the component of variance and repeatability increased significantly and tended to be stabilized in the second year after planting. The repeatability of clone was between 0.65 and 0.90. From the third year on, both the correlation coefficient of height, DBH and the lately corresponding character and the correlation coefficient of height DBH and lately volume became higher and tended to be stabilized. The genetic correlation coefficient is larger than the coefficient of order, phenotype and environment. This showed that the growth correlation coefficient is mainly controlled by heredity, and early selection is effective. The best age of early selection is at 3rd and 4th year. The selective efficiency of early D late V is higher than that of early H late V, and the age of the former which has the biggest selective efficiency emerges earlier than that of the later. So the DBH is an efficient selective index.