Comprehensive index selection on superior growth and wood properties of Eucalyptus cloeziana for saw timber

doi:10.3969/j.issn.1000-2006.201805018

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2019, Vol. 43 ›› Issue (01): 1-8.doi: 10.3969/j.issn.1000-2006.201805018

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Comprehensive index selection on superior growth and wood properties of Eucalyptus cloeziana for saw timber

LI Changrong¹, CHEN Jianbo¹, GUO Dongqiang¹, WENG Qijie², LU Cuixiang¹, LI Jianfan³, ZHOU Wei^1*, GAN Siming^2*

1.Guangxi Forestry Research Institute, Nanning 530002, China; 2.Research Institute of Tropical Forestry, CAF, Guangzhou 510520, China; 3.Yulin Forestry Research Institute, Yulin 537501, China

Online:2019-01-28 Published:2019-01-28

Abstract

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 115 open-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(ρ_BD), green density(ρ_GD), modulus of elasticity in static bending(E_MOE), modulus of rupture(σ_MOR), and compressive strength parallel to grain(σ_c)were measured using near-infrared(NIR)spectroscopy. Multi-trait selection incorporated tree height(H), diameter at breast height(D), individual tree volume(V), ρ_GD, ρ_BD, E_MOE, σ_MOR and σ_c using the Smith-Hazel index selection procedure. 【Results】 The trial averages for D, H, V, ρ_GD, ρ_BD, E_MOE, σ_MOR and σ_c were 20.6 cm, 20.0 m, 0.307 m³, 1.109 g/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 ρ_BD, but were extremely significantly negative between D and E_MOE, ρ_GD and σ_MOR, and significantly negative between D and σ_c. 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 ρ_BD to other wood properties was positive. ρ_BDtoσ_chad the highest selection efficiency. The superior provenances selected using index selection were from the southern 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 furniture. 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 ρ_BD 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.

CLC Number:

S718.46

LI Changrong, CHEN Jianbo, GUO Dongqiang, WENG Qijie, LU Cuixiang, LI Jianfan, ZHOU Wei, GAN Siming. Comprehensive index selection on superior growth and wood properties of Eucalyptus cloeziana for saw timber[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2019, 43(01): 1-8.

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Comprehensive index selection on superior growth and wood properties of Eucalyptus cloeziana for saw timber

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