日本落叶松家系对树高生长模型参数的影响

以湖北省建始县长岭岗林场 15年生日本落叶松子代测定林为研究对象 ,研究了家系间优势高的生长变异 ,家系对树高生长模型参数影响的显著性检验 ,并构建了日本落叶松家系树高生长模型。研究表明 ,同一立地不同家系的树高—年龄关系为多形曲线 ,不仅渐近线存在显著差异 ,而且曲线的形状也发生改变 ,应采用不同的生长模式来描述其树高生长过程 ,优势高生长是环境差异和遗传变异的树木表现型的综合反映 ,树高生长潜力 (立地指数 )随着遗传改良材料的应用而增大 :Schumacher和Richards方程对模拟日本落叶松幼龄阶段不同家系的优势高生长过程均能达到令人满意的效果 :家系间优势高的差距随年龄而增大 ,且家系间连年生长速率也各不相同。

Analyzing Parameters of Height-Age Models for Open-Pollinated Japanese Larch Families

This study was carried out in a 15_year_old progeny test forest of open_pollinated families for %Larix kaempferi% in Jianshi County, Hubei Province. The growth variation of dominant height among Japanese larch families was analyzed, and height_age models were developed for each family. Aanalysis of variance revealed that height_age curves were polymorphism among families at a given location due to differences in asymptote and rate parameter but with same shape parameter. Therefore, it was necessary to develop separate height_age curves for each family. Dominant height (or site indices) would increase with the application of genetically improved materials. Results demonstrated that both logarithmic linear Schumacher equation and flexible non_linear Richards equation could be used to describe the dominant height_age curves of the juvenile Larix kaempferi families. The differences of dominant height among families were increased with age, and their growth rates were also various. Reasonable height_age relationships would be simulated by fitting to the progeny test data if the models selection and calculation were suitable. With combination of the general unimproved stand growth models of this species, the growth, yield and genetic gain of improvement stands could be predicted properly.