To conduct a preliminary evaluation and select superior clonal lines of Larix olgensis, this study used 68 clonal lines from the Larix olgensis collection area at the Qingshan National Larch Seed Orchard in Linkou County, Mudanjiang City, Heilongjiang Province, as materials, measured their growth and wood quality traits were measured, and analyzed them using variation analysis, variance analysis, correlation analysis, and other methods for comprehensive evaluation. The results of the variance analysis showed that the differences in growth and wood quality traits among the clonal lines were highly significant. The variation analysis of growth and wood quality traits indicated that the coefficients of variation ranged from 2.55% to 19.71%, with volume exhibiting the largest coefficient of variation and total cellulose having the smallest. The repeatability values ranged from 0.602 to 0.924, with tree height showing the highest repeatability, followed by basic density and total cellulose. Correlation analysis revealed that diameter at breast height (DBH) was significantly positively correlated with tree height, and the east-west crown width was highly positively correlated with the north-south crown width. Volume, DBH, and tree height all exhibited significant positive correlations, with a stronger correlation between volume and DBH, indicating that volume was more influenced by DBH. Furthermore, correlation analysis revealed no significant relationship between growth traits and wood quality traits. Using the Breeding multi-trait evaluation method, superior clonal lines were selected based on both growth and wood quality traits, with a selection rate of 15%. The superior clonal lines selected for growth traits were 241, 456, 96, 475, 179, 161, 83, 759, 339, and 43, while those selected for wood quality traits were 357, 223, 161, 7, 249, 741, 657, 14, 475, and 113. The clonal lines 475 and 161 exhibited excellent performance in both growth and wood quality traits. The selected superior clonal lines can provide valuable material for the future breeding of superior varieties.
DENGJ F.Genetic variations in pulpwood qualities of generation of open-pollinated hybrid Larch and multi-traits selection[D].Harbin:Northeast Forestry University,2011.
WANGJ X, YANP Y, SUNB F,et al.Growth variation and superior families early selection of Larix olgensis free-pollinated families[J].Journal of Nanjing Forestry University (Natural Sciences Edition),2024,48(5):81-89.
[22]
FRIESA.Genetic parameters,genetic gain and correlated responses in growth,fibre dimensions and wood density in a Scots pine breeding population[J].Annals of Forest Science,2012,69(7):783-794.
[23]
赖猛.落叶松无性系遗传评价与早期选择研究[D].北京:中国林业科学研究院,2015.
[24]
LAIM.Genotypic evaluation and early selection of Larix clones[D].Beijing:Chinese Academy of Forestry,2015.
LUW D, LIUY X, CUIY Z.A study on the wood properties of the geographic provenances of plantation of Larix olgensis [J].China Wood Industry,1993(1):34-37.
LIY X, ZHANGH G, DENGJ F,et al.Correlations among wood density,wood physical mechanics index and growth trait,and selection of elite families for production of building products in Larix olgensis [J].Journal of Beijing Forestry University,2012,34(5):6-14.
ZHANGX X, XIAH, ZHAOX,et al.Comprehensive evaluation of growth and fruit traits of Larix olgensis parents in seed orchard[J].Bulletin of Botanical Research,2017,37(6):933-940.
[35]
夏辉.长白落叶松种子园优良亲本评价选择[D].哈尔滨:东北林业大学,2018.
[36]
XIAH.Evaluation and selection of excellent parents in Larix olgensis seed orchard[D].Harbin:Northeast Forestry University,2018.
[37]
续九如.林木数量遗传学[M].北京:高等教育出版社,2006.
[38]
XUJ R.Quantitative genetics of trees[M].Beijing:Higher Education Press,2006.
WANGJ N, HOUD, ZHANGH G,et al.Genetic variation on growth characters and family selection of Larix olgensis Henry[J].Forest Engineering,2018,34(1):6-12.
YINS P.The evaluation and selection of Larix olgensis excellent clones and SNP correlation analysis of wood property[D].Harbin:Northeast Forestry University,2018.
JIAQ B, ZHANGH G, ZHANGL,et al.Variation analysis of hybrid Larch families and superior families selection[J].Journal of Northeast Forestry University,2016,44(4):1-7.
[49]
BELONGERP J, MCKES E, JETTJ B.Genetic and environmental effects on biomass production and wood density in Loblolly pine[J].Tree Improvement for Sustainable Tropical Forestry,1996(2):307-310.