杉木半同胞家系生长和材性遗传变异研究

对 1 0年生杉木半同胞家系的生长和木材品质性状的遗传变异的研究表明 ,树高、胸径和材积、管胞长度、管胞宽度在家系间存在显著差异 ,木材基本密度和管胞长宽比在家系间差异不显著。树高、胸径、材积、木材基本密度、管胞长度、管胞宽度和管胞长宽比的家系遗传力分别为 0 .697、0 .841、0 .836、0 .31 7、0 .462、0 471和 0 .2 49,单株遗传力分别为 0 .42 5、0 .671、0 .71 6、0 .2 49、0 .437、0 l45、0 .1 81。木材基本密度与树高、胸径、材积、管胞长度、管胞宽度和管胞长宽比都呈负相关 ,只有基本密度与管胞长度的负相关达到显著水平。选出的 4个优良家系 ,树高、胸径、材积、基本密度、管胞长度、管胞宽度和管胞长宽比的遗传增益分别为 3 96%、4.31 %、1 2 .69%、0 .1 2 %、 0 .65 %、 0 .69%和 0 0 3%。

Study on the genetic variation of growth traits and wood properties for Chinese Fir half-sib families

There were highly significant differences among families in height,diameter at breast height(DBH),bole volume,trechaid length and trechaid width,but differences among families in wood basic density and the ratio of length to width of trechaid were insignificant. Family heritability were 0.697,0.841,0.836,0.317,0.462,0.471 and 0.249,and individual heritability were 0.425,0.671,0.716,0.249,0.437,0.l45 and 0.181 respectively for height,diameter at breast height,bole volume,wood basic density,trechaid length,trechaid width and the ratio of length to width of trechaid. Wood basic density was negatively related to height, diameter at breast height,bole volume,trechaid length,trechaid width and the ratio of length to width of trechaid,but only the negative correlation of wood basic density with trechaid length was significant. Four families were selected and their genetic gains were 3.96%,4.31%,12.69%,0.12%,-0.65%,-0.69% and -0.03% in height,diameter at breast height,bole volume,wood basic density, trechaid length,trechaid width and the ratio of length to width of trechaid respectively.