杉木种子园无性系结实遗传与变异研究

杉木Cunninghamia lanceolata(Lamb.)Hook]是我国特有的主要用材树种,对其生长性状(如树高、胸径、材积等)遗传与变异的研究,已有很多的报道,而对其结实的研究却很少。随着国内林业生产的发展,对杉木良种需求的数量愈来愈大。因此有必要对杉木结实的遗传与变异进行研究,为种子园营建及经营管理提供依据。

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.