Genetic Variation and Comprehensive Evaluation in Growth and Wood Relevant Properties of Different Provenances of Tectona grandis

LAI Meng; LIANG Kun-nan; HUANG Gui-hua; LIN Ming-ping; ZHOU Zai-zhi; MA Hua-ming

Research was carried out on the growth and wood relevant properties of six provenances of 27-year-old Tectona grandis in Ledong Country, Hainan Island. The results showed that there existed significant differences among these provenances in bark thickness, heartwood width, basic density as well as tree height, tree volume, height of fresh branch and sapwood width. For the DBH, the number sapwood rings and the heartwood content, there were not significant differences. It has great potentials to improve the growth and wood property of T. grandis in provenances level and the good results could be obtained in growth properties, basic density and sapwood width by provenance selection. The broad-sense heritabilities for tree height (0.601 6), tree girth (0.593 2), tree volume (0.586 8), height of fresh branch (0.686 5), bark thickness (0.796 3), sapwood number (0.543 4), sapwood width (0.670 0), heartwood width (0.723 0), heartwood content (0.473 7), and basic density (0.937 3) of the six provenances were calculated. The results indicated that growth and wood properties were controlled by moderate or high-moderate genetic heritability. So, high genetic gains could be obtained by inter-provenance selection with suitable intensity. In addition, the growth and wood relevant properties of the 6 provenances were comprehensively evaluated which could provides a base for the selection of T. grandis provenances.

1. Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou 510520, Guangdong, China

Received Date: 2010-07-15

Abstract: Research was carried out on the growth and wood relevant properties of six provenances of 27-year-old Tectona grandis in Ledong Country, Hainan Island. The results showed that there existed significant differences among these provenances in bark thickness, heartwood width, basic density as well as tree height, tree volume, height of fresh branch and sapwood width. For the DBH, the number sapwood rings and the heartwood content, there were not significant differences. It has great potentials to improve the growth and wood property of T. grandis in provenances level and the good results could be obtained in growth properties, basic density and sapwood width by provenance selection. The broad-sense heritabilities for tree height (0.601 6), tree girth (0.593 2), tree volume (0.586 8), height of fresh branch (0.686 5), bark thickness (0.796 3), sapwood number (0.543 4), sapwood width (0.670 0), heartwood width (0.723 0), heartwood content (0.473 7), and basic density (0.937 3) of the six provenances were calculated. The results indicated that growth and wood properties were controlled by moderate or high-moderate genetic heritability. So, high genetic gains could be obtained by inter-provenance selection with suitable intensity. In addition, the growth and wood relevant properties of the 6 provenances were comprehensively evaluated which could provides a base for the selection of T. grandis provenances.

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Genetic Variation and Comprehensive Evaluation in Growth and Wood Relevant Properties of Different Provenances of Tectona grandis

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