Study on the Genetics and Variation of the Clones Fruit Bearing in Chinese Fir Seed Orchard

Studies on the cone yields from 3 Chinese Fir seed orchard (6~i3-years-old) showed that there are significant variations in different clones, trees or year. Variation in different year was the biggest, in a range of 62.95%~96.7%, variation in different clones was lower, in a range of0.93%~6.44%. The generalized genetic ability of fruit bearing of individual tree was 0.33, while that of different clone was 0.79. The clone which made up 90% of the total cone yield in orchard was 62.1%. The extreme difference of cone yield was 1.18-6.26 kg per tree and the variation coefficient was 47.16%~90.12%. The variation coefficient reduces gradually as the age increases. The average differences of the cone yield among trees in the same clone was 1.l2~5.09kg per tree. The mean variation coefficient was 54.73%-122.82%. The cone yield extreme difference among the year was great.