杂种落叶松家系不同年龄变异及早期选择

以黑龙江省林口县青山林场30年生杂种落叶松子代测定林中的16个家系为研究对象,测定不同年龄木材的密度、纤维素质量分数,估算各性状的变异系数、分析其差异性及相关性。结果表明:家系密度平均为0.474 g·cm~(-3),其变异系数为7.64%,最大家系为12.14%,最小家系为3.38%;纤维素质量分数平均为50.212%,其变异系数为3.38%,最大家系为5.36%,最小家系为1.41%,变异不同,选择利用也存在区别。木材密度与纤维素质量分数表现着正相关关系,与木质素质量分数存在着微弱的负相关关系,有利于联合选择。7年生及以上林龄的基本密度、纤维素质量分数、半纤维素质量分数与25~27 a的结果具有极显著的相关性,早期选择是可行的,但不同家系选择时间存在差别。

Variation and Early Selection of Hybrid Larch Families in Different Ages

With 16 families from progeny test plantation of 30-year-old hybrid larch from Qingshan Forest Farm in Linkou County of Heilongjiang Province, we determined the density and cellulose content of different age groups.We estimated the coefficient of genetic variation of each trait, and analyzed the differences and correlations coefficient.The results showed that the average density was 0.474g·cm-3, the coefficient of variation was 7.64%, the largest was 12.14%, the smallest was 3.38%;the average cellulose was 50.212%, the coefficient of variation was 3.38%, the largest was 5.36%, the smallest was 1.41%, and there were differences between different selection and utilization of variation.There was positive correlation between the wood density and the cellulose content, there was a weak negative correlation between wood density and lignin content, which was beneficial to the joint selection.The density, cellulose content and hemicellulose content of 7-year-old and later were highly correlated with the results of those of 25-27-years, the early selection was feasible, but there were differences in the selection time of different families.