25年生马尾松生长和木材基本密度家系变异与选择
Growth and Wood Density of 25-year-old Masson's Pine: Inter-family Variation and Selection
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摘要: 以福建省华安县西陂林场的25年生来自省内不同产地的46个马尾松自由授粉家系试验林为试材,研究了达主伐年龄时马尾松生长、干形和木材基本密度的家系差异以及性状间的相关性,并依据不同培育目标选择优良家系。结果表明,马尾松生长、树干圆满度和木材基本密度皆存在显著的家系差异,其中生长和树干通直度变异相对较大,而树干圆满度和木材基本密度变异较小,变异系数在10%以下。生长和干形性状受到弱至中度的家系遗传控制,家系遗传力为0.23 0.46;木材密度受到的遗传控制相对较强,家系遗传力为0.46。性状遗传相关分析结果显示,选择速生种源可同时改良树干圆满度,但对树干通直度和木材基本密度影响不大。根据不同用材对材质材性要求,选出24个纸浆纤维材优良家系和6个锯材优良家系,平均木材干物质量和胸径生长皆为对照的1.16倍。Abstract: 25-year-old Masson's pine (Pinus massoniana) trials including 46 open-pollinated families located at Hua'an county in Fujian province were used to reveal the variation among families in growth, stem-form qualities and wood basic density, and select superior families suitable for producing pulp wood and building timber, respectively. The results indicated that there existed significant differences among families in growth, stem fullness and wood basic density. The variation was relative larger for growth and stem straightness than the other traits. The coefficients of variation of stem fullness and wood basic density were below 10%. It was found that growth, stem form and wood basic density were under moderate to weak family genetic control, and family heritability ranged from 0.23 to 0.46. Among test traits, the family heritability of wood basic density was the largest which reached 0.46. Genetic correlation suggested that the stem fullness could be concurrently improved by selecting the fast-growing families. However, the wood basic density and stem straightness were not influenced by growth. 24 and 6 superior families were selected for pulpwood and sawn timber, respectively. Both of the mean wood dry matter accumulation and DBH growth were 1.16 times that of the control.
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Key words:
- Pinus massoniana
- / family
- / growth
- / stem form
- / wood basic density
- / selection
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