摘要
【目的】研究无性系早期生长、早晚性状相关以及早期选择年龄,为柚木无性系早期选择提供科学依据。【方法】以柚木23个无性系为材料,采用完全随机区组设计,6株单行小区,6次重复,开展了柚木无性系测定试验研究,调查了1~11年生无性系树高和胸径生长,并对历年生长性状进行方差分析,重复力和遗传力估算,年-年表型相关和遗传相关分析,以主成分分析方法得出的第一主分量划分生长类型,并通过综合分析确定柚木无性系最早选择年龄。【结果】1~11年生树高和胸径生长方差分析结果表明无性系间差异极显著,F值均随着树龄的增加而增加,7年生时达到最大,然后下降;无性系(试验林)的树高和胸径变异系数分别为4.03%~9.38和6.90%~9.98%,同一年份胸径变异系数大于树高变异系数,但均随着树龄的增加而减低,于5年生后趋向稳定;1~11年生无性系树高和胸径的重复力和遗传力分别为0.768~0.935和0.110~0.310,它们的变化趋势表现一致,先逐年增加到7年生达最大,然后下降并趋于稳定;树高和胸径的3~11 a的表型和遗传相关关系极显著(P<0.001),遗传相关高于表型相关,5年后的树高和胸径表型和遗传相关系数均趋于稳定;根据主成分分析第一主分量划分不同时期快、中和慢3种生长类型,不管生长快和慢,前期生长与后期生长保持不变的无性系达75%,无性系早期选择可行。【结论】初步确定5年生可作为柚木无性系早期选择的年龄,以此年龄按20%选择强度预选11年生柚木最优无性系,其选准率达80%。
【Objective】This research was conducted to study the early growth,the correlation between early and late growth characters and the early selection age of teak(Tectona grandis L.f.)clones to provide a scientific basis for the early selection of teak clones.【Method】Using 23 teak clones as materials,6-tree single-row plots with 6 replicates were designed by a completely randomized block design.The tree height and DBH growth of the 1 to 11-year-old clones were investigated.Variance analysis,repeatability and heritability estimation,phenotypic correlation and genetic correlation analysis were carried out.The first principal component obtained by principal component analysis was used to divide the growth types,and the earliest selection age of teak clones was determined by comprehensive analysis.【Result】The variance analysis of tree height and DBH growth of the 1 to 11-year-old clones showed that the differences among clones were extremely significant.The F values increased with tree age,which reached the maximum value at the age of 7-yearold,followed by a decrease.The variation coefficients of tree height and DBH of clones(experimental forest)were 4.03%-9.38%and 6.90%-9.98%,respectively.The variation coefficient of DBH in the same year was greater than that of tree height,but both values decreased with tree age and tended to be stable after the age of 5.The repeatability and heritability of tree height and DBH of the 1 to11-year-old clones were 0.768-0.935 and 0.110-0.310,respectively,and their changing trends were consistent,increasing year by year to the age of 7 and reaching the maximum,then decreasing and tending to be stable.The phenotypic and genetic correlations between tree height and DBH of the clones were extremely significant from the 3rd to 11th year(P<0.001).The genetic correlation was higher than the phenotypic correlation,and the phenotypic and genetic correlation coefficients of tree height and DBH were stable after 5 years.According to the first principal component,three growth types of fast,medium and slow in different periods were divided.Regardless of fast and slow growth,75%of the clones maintained the same growth in the early and late stages,and the early selection of clones was feasible.【Conclusion】The 5-year-old clones can be used for the early selection of teak clones.According to the early selection age and 20%selection strength,the optimal 11-year-old clones have been selected with a selection accuracy rate of 80%.
作者
付强
黄桂华
周强
王先棒
周再知
张绍祥
梁坤南
FU Qiang;HUANG Guihua;ZHOU Qiang;WANG Xianbang;ZHOU Zaizhi;ZHANG Shaoxiang;LIANG Kunnan(Forestry and Grassland Seedling Workstation of Puer City,Puer 665000,Yunnan,China;Research Institute of Tropical Forestry,China Academy of Forestry,Key Laboratory of Tropical Forestry Research,National Forestry and Grassland Administration,Guangzhou 510520,Guangdong,China;Forestry Technology Extension Centre of Jinggu Dai and Yi Autonomous County,Jinggu 666400,Yunnan,China)
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2022年第10期30-38,共9页
Journal of Central South University of Forestry & Technology
基金
“十三五”国家重点研发计划项目(2016YFD0600602)。
关键词
柚木
无性系
早晚相关
早期选择年龄
teak
clone
early and late correlation
early selection age
