马褂木地理遗传变异和优良种源选择

利用设置在福建省邵武市的马褂木全分布区种源试验林（15个种源）8年生测定材料，首次系统研究了造林死亡率、侧枝形成分叉干率、生长、干形和木材基本密度等性状在种源间的遗传差异及其地理分异模式，结果显示，马褂木种源效应非常显著，但由于生境片断化导致的小种群效应和距离隔离效应等，除木材基本密度受产地经度影响外，上述诸性状多呈随机分布，不存在典型的倾群变异模式。通过系统聚类仅可将成马褂木粗略地划分成2个聚类大组和4个聚类亚组，并按照纸浆材和胶合板材不同培育目标，分别选择确定了相应的优良种源。研究发现，马褂木对立地环境反应敏感，种源与立地环境互作显著，在商品林建设时应予充分重视。

GEOGRAPHIC GENETIC VARIATION AND PROVENANCE SELECTION OF LIRIODENDRON CHINENSE

Based on the data determined for 8 years from a Liriodendron chinense provenance trial located at Shaowu city of Fujian Province including 15 seed sources representing the natural range of the species was used to study firstly genetic variation between provenances and geographic differentiation pattern for main economic traits such as mortality,stem forking by branch formed, growth,stem form and wood basic density.The results indicated that there were great provenance effects for most traits.A classical clinal variation pattern for main economic traits beside wood basic density was not found because of effects of habitat fragmentation on genetic structure of the population (small population effect and isolation by distance effect,etc.).The range of the species in China can be divided roughly into two provenance regions and four sub-regions by cluster analysis.Superior provenances could be selected and recommended for pulpwood slash and plywood respectively.Marked sensitivity to site condition was observed,there were significant interactions between provenance and site environment,which must be considered in commercial plantation development.