杉木2代种子园子代主要经济性状遗传变异及单株选择

(Cunninghamialanceolata(Lamb.)Hook.)作为我国南方林区重要的用材树种,经过几十年的遗传改良已进入到高世代时期,遗传改良工作取得了较大进展,林木生长量也已获得较大增长.20世纪90年代初浙江省从杉木1代种子园家系子代测定林、杂交试验林和种源试验林中选择出优良材料营建了2代种子园1],对新建的种子园材料进行子代测定是林木遗传改良的重要工作,不仅可了解其种子园的改良效果和主要经济性状遗传变异规律,也可为高世代种子园营建提供选择材料.

Genetic Variation and Individual Plant Selection of Main Economic Traits ofProgenies from the Second-generation Seed Orchards of Chinese Fir

The three main economic traits of DBH, DBH of dominant tree and wood basic density of dominant tree in 13-year-old progeny stand from the second-generation seed orchards of Chinese fir in Changle of Yuhang district, Zhejiang province were analyzed. The results showed that three economic traits were highly significant on each trait among the families, and their broad heritability was high. The genetic correlation coefficient was weakly negative correlated among growth traits and wood basic density. The correlation coefficient was significant positive correlated among 3-year-old tree height, 7-year-old tree height and DBH, 13-year-old DBH. Ten better families and individual plants were selected in interim period by index method with two traits of DBH and wood basic density, keeping wood basic density unchanged to compared with experiment population, the average DBHs of the family and individual plant were 7.59% and 59.16% higher than the experiment population respectively.