秃杉种源-家系遗传变异研究

Genetic Variation Among Provenances and Families of Taiwania flousiana Gaussen

4年生秃杉种源 -家系试验表明 ,秃杉种源间、种源内家系生长性状差异显著 .在遗传方差中 ,种源所占比例大于家系遗传方差 ,秃杉选择应优先选择种源 ,在此基础上选择家系 .用主成分遗传指数得分值综合树高、胸径、材积性状评价种源 ,优良种源有贵州格、贵州交、贵州昂、云南龙陵、贵州丹 ,单株材积遗传增益为 2 6 33% ,实际增益为 30 75 % .

An analysis of the 4-year trial of Taiwania flousiana Gaussen provenances and families among a provenance indicated significant growth differences between provenances and between families. Among the genetic variance, the variance components of provenances were greater than those of families, so the provenance selection should be preferential and followed by family selection. Evaluated with the values of principal genetic index based on height, diameter and single volume, Guizhou Ge, Guizhou Jiao, Guizhou Ang, Yunnan Longling and Guizhou Dan were found to be elite provenances. The genetic gain of single volume was 26 33% and the actual gain was 30 75%. No significant geography variation trend for provenances was discovered.