南京林业大学学报（自然科学版）2019，Vol.43Issue(1)：1-8,8.DOI:10.3969/j.issn.1000-2006.201805018
锯材大花序桉生长和材性的综合指数选择
Comprehensive index selection on superior growth and wood properties of Eucalyptus cloeziana for saw timber
摘要
Abstract
[Objective]Eucalyptus cloeziana is one of the most promising Eucalyptus species for high-value solid wood production and a saw timber breeding objective has been developed for southern China.The purpose of this research was to select provenances and families with superior growth and wood properties.[Method]The 9.5 year-old provenance/family testing forest of E.cloeziana was used as the research materials.The E.cloeziana testing forest was comprised of 115open-pollinated families of 17 provenances were planted at the Yulin Forestry Research Institute (110°09'E, 22°39'N), Guangxi Province, China in May 2004.The progeny seeds were provided by the Australian Tree Seed Centre (Canberra, Australia).The trial was laid out in randomized complete blocks along the contours, with 30 replicates of single tree plots.Wood mechanical properties at 9.5 years of age, including basic density (ρBD), green density (ρGD), modulus of elasticity in static bending (EMOE), modulus of rupture (σMOR), and compressive strength parallel to grain (σc) were measured using near-infrared (NIR) spectroscopy.Multi-trait selection incorporated tree height (H), diameter at breast height (D), individual tree volume (V), ρGD, ρBD, EMOE, σMORandσcusing the Smith-Hazel index selection procedure.[Results]The trial averages for D, H, V, ρGD, ρBD, EMOE, σMORandσcwere 20.6 cm, 20.0 m, 0.307 m3, 1.109g/cm3, 0.659 g/cm3, 14.7 GPa, 158.2 MPa and 63.3 MPa, respectively.Growth and wood properties exhibited significant differences among provenances (P ＜ 0.01) and among families within a provenance (P ＜ 0.05). The significant genetic variation for these traits indicated the strong potential for genetic improvement through selection at both provenance and family levels. Genetic correlations were significantly positive between growth traits and were not different from zero between wood properties. The additive genetic correlations were not significantly negative between D and PB口, but were extremely significantly negative between D and EMOE, ρGD and σMOR' and significantly negative between D and σc'The genetic advance of D direct selection was 410.2％ and the effect of D direct selection was the best. The indirect selection efficiency of D to V was 174.3％, and the indirect selection of PBD to other wood properties was positive. PBDtoσc had the highest selection efficiency. The superior provenances selected using index selection were from the southem coastal area of the native range of the species in Australia. [Conclusion] The wood mechanical properties of 9.5 year-old E. cloeziana were similar to that of Pterocarpus L., which is a well-known high-value timber used for the production of fumiture. The additive genetic correlations were negatively significant between growth traits and wood mechanical traits,posing a challenge for concomitant improvement of growth and wood traits. The indirect selection effect of growth to wood properties was small, whereas ρBD had a favorable indirect selection effect with other wood properties. Trees could be selected using the comprehensive index selection method to identify a production population that would provide seed with inherently superior growth and wood properties required to develop high-value forest products.关键词
大花序桉/种源/家系/生长/材性/综合指数选择Key words
Eucalyptus cloeziana/provenance/family/growth/wood property/comprehensive index selection分类
农业科技引用本文复制引用
李昌荣,陈健波,郭东强,翁启杰,卢翠香,李建凡,周维,甘四明..锯材大花序桉生长和材性的综合指数选择[J].南京林业大学学报（自然科学版）,2019,43(1):1-8,8.基金项目
广西林业科技项目(桂林科研[2015]第6号,桂林科字[2014]第04号) （桂林科研[2015]第6号,桂林科字[2014]第04号）
广西创新驱动发展资金项目(桂科AA17204087-3) （桂科AA17204087-3）
广西主要用材林资源高效培育与利用人才小高地专项(桂人社函[2018]112) （桂人社函[2018]112）
