火炬松纸浆材优良家系多性状选择

对６年生火炬松自由授粉子代测定林进行了生长、材性和干形等性状的遗传参数估算和相关关系分析。树高、木材基本密度在家系间存在极显著差异，且具有较高的遗传力，胸径、材积、干材干重和管胞长度具中度遗传力，树干通直度和分枝性状未发现显著的家系间差异。干材干重与生长性状呈高度正相关，与木材基本密度呈微弱的负相关，而与管胞长度呈负相关。以浆材为选择目的进行家系指数选择，认为包含产量（干材干重）和质量（木材基本密

Multitraits Selection of Loblolly Pine Families for Pulpwood

Estimates of genetic parameters and correlation analyses are presented for growth,wood properties and form traits of a 6 years old open polleinated progeny test of P.taeda .There are very significant differences in stem height,and wood basic density between families and with higher family heritabilities and in stem diameter,volume,bole biomass and fiber length, there are moderate heritabilities.As for stem straightness,branch angle and diameter no difference has been found. Bole biomass have strong genetic correlation with growth traits and weak correlation with basic density,and adverse correlation with fiber length. Take pulpwood production as the breeding goal,the comparison of several multiple trait index selections showed that the index should be incorporating bole biomass and basic density and placing more emphasis upon biomass is more ideal. Five elite families have been selected according to the index.