长白落叶松×日本落叶松杂种全同胞家系纸浆材材性遗传变异OA

To select hybrid larch(Larix spp.)families with excellent genetic characteristics and breed new larch pulpwood vari-eties with superior growth performance and high-quality wood properties,12 33-year-old full-sib families of Larix olgensis×Larix kaempferi hybrid were sampled from Qingshan National Larch Improved Variety Base in Linkou County,Heilongjiang Province.Growth traits,wood properties and pulping characteristics were determined,and genetic variation as well as multi-trait comprehensive evaluation were further analyzed.The results showed that except for coarse pulp yield and fine pulp yield,significant differences were observed among the 12 families in tree height,diameter at breast height(DBH),volume,basic wood density,fiber morphology and cellulose content.Correlation analysis indicated that tree height,DBH and volume were significantly or extremely significantly positively correlated with pulp yield,basic wood density presented an extremely significant negative correlation with fine pulp yield,fiber length was significantly positively correlated with fi-ber length-width ratio,fiber width was extremely significantly negatively correlated with fiber length-width ratio.Based on principal component analysis and Breckin multi-trait comprehensive evaluation method,three superior families with com-prehensive desirable traits were screened out at a selection rate of 25%,namely 73-27×Cao 16,73-14×Ri 3 and 73-27×Cao 18.This study revealed the genetic relationships among phenotypic traits of hybrid larch families.