木麻黄速生抗风害性状的育种值预测与优良个体的初步选择OA北大核心CSTPCD

[Objectives]This study aims to evaluate the wind resistance of Casuarina equisetifolia and select superior individuals with rapid growth and high wind resistance in the international provenance trial forest of C.equisetifolia,which was affected by typhoon"Du Suri".[Method]In this study,a 10-year-old C.equisetifolia provenance trial forest with 109 families,23 provenances from 10 countries,introduced from the Australian Forest Seed Center,was used as selection materials.Based on disaster survey data after undergoing typhoon"Dusu Rui"attack,the BLUP mixed linear model method was used to measure and estimate the growth traits and heritability.A comprehensive selection of superior families and individuals of C.equisetifolia was made by combining the rates of breakage,lodging,survival,and typhoon damage.[Result]There were extremely significant differences(P＜0.001)in tree height,diameter at breast height(DBH),volume,and survival rate among different families,and the crown width showed significant difference(P＜0.01).There were no dignificant differences in lodging rate,breakage rate,and extent of damage(P＞0.05).Except for the survival rate,the heritability of other traits in the Casuarina provenance forest was lower than that of individuals.By setting the selection criteria as a breeding value for volume greater than 0,excluding families with a survival rate below average,and a selection rate of 20％,22 superior fast-growing families were identified.The genetic gains in tree height,DBH,individual tree volume,and crown width for these families were 18.27％,23.2％,49.9％,and 24.3％,respectively.Using positive individual tree volume breeding values and a selection rate of 10％as criteria,106 superior individuals were selected.The genetic gains in tree height,DBH,individual volume,and crown width for these individuals were 21.0％,44.4％,101.8％,and 38.5％,respectively.[Conclusion]There are significant differences in growth traits among different C.equisetifolia families after the typhoon attack,indicating strong potential for selection.Based on the breeding values for volume traits combined with survival rates,22 superior families and 106 superior individuals have been selected as materials for further genetic improvement.The selection can provide materials for the establishment of the first-generation seed orchard of Casuarina and enrich the core production population.