杉木杂交试验幼林主要生长性状遗传分析

2013年在浙江龙泉杉木Cunninghamia lanceolata 3代种子园中开展杉木杂交试验(4×5,NCⅡ遗传设计),获得杂交组合20个,2014年3月和2015年3月分别在浙江开化县林场进行了育苗和造林试验,2017年11月对造林后3a时的树高和胸径两生长性状进行了测定和分析,以此两生长性状采用比较法进行幼林期速生型优良杂交组合选择。结果表明:杉木杂交组合的树高、胸径两生长性状在组合间和母本间存在极显著差异(α=0.01),且树高性状的母本×父本交互效应也达显著差异(α=0.01);树高和胸径两生长性状均有较高的一般配合力方差分量。树高和胸径两生长性状的一般配合力效应值母本C25-3和父本L15-3为较高正值。根据树高和胸径生长量,采用比较法初选出4个幼林期生长较快的杂交组合,造林后3年生时其树高和胸径的平均值分别为3.44 m和4.43cm,其树高和胸径的平均值比CK1(龙泉杉木2代种子园混种)分别高出了12.42%和24.44%,比CK3(洋口061)分别高出了9.55%和26.93%,比CK2(洋口020)分别高出了1.48%和9.38%。

Genetic Analysis on Main Growth Traits of Cunninghamia lanceolata Cross Combinations

Cross experiment was conducted in third generation clonal Cunninghamia lanceolata seed orchard in Longquan, Zhejiang province in February and March of 2013. 20 cross combinations were obtained for seedling cultivation and afforestation test in Kaihua, Zhejiang in March, 2014 and 2015. Tree height and DBH was determined in November, 2017. The results showed that it had extremely significant difference (α=0.01) of tree height and DBH among cross combinations and female parents, and as well as it had also the same difference of tree height among interactions of female × male. Tree height and DBH of cross combination had higher general combining ability. 4 fast-growing crossing combinations were selected by comparison on tree height and DBH, with mean tree height and DBH of 3.44 m and 4.43 cm.