15个桉树无性系基因与环境互作研究
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针对桉树人工林造林树种单一,为桉树优良无性系选育、开发、测试提供依据和参考,本研究对15个桉树无性系在3种不同立地条件下的生长表现进行了对比研究,对生长性状的基因型和环境互作效应做了系统的分析。结果表明:无性系Y9在3种立地条件下表现相对稳定且生长性状优良,其树高、胸径、材积的基因效应为2.33、2.36、0.0468,要远大于环境效应,说明生长表现受环境影响较小,其广泛的适应性和稳定性具有潜在的推广价值,15个杂交桉无性系生长性状基因型与环境互作效应强度各不相同,互作效应大小与方向在无性系与地点间不同而发生变化,表明了基因型与环境型的复杂性和多样性。在三个点抗风性最好的无性系为Y7、Y9、Y6、Y15,沿海台风地区Y7、Y9、Y6、Y15具有较大的推广潜力。本研究在一定程度上能为桉树无性系选育、测试、推广提供参考。
Aiming to address the issue of single tree species in eucalyptus plantation forests and provide scientific references and basis for the selection, development and testing of superior eucalyptus clones, this study conducted a comparative investigation on the growth performance of 15 eucalyptus clones under three distinct site conditions, and systematically analyzed the genotype-by-environment interaction effects of their growth traits. The results showed that clone Y9 exhibited relatively stable growth and excellent performance across all three site conditions. The genetic effects of its tree height, diameter at breast height (DBH) and timber volume were 2.33, 2.36 and 0.0468 respectively, which were much greater than the environmental effects, indicating that its growth performance was less affected by the environment. Its wide adaptability and stability endow it with potential popularization value. The genotype-by-environment interaction effect intensities of growth traits for the 15 hybrid eucalyptus clones varied among each other. The magnitude and direction of the interaction effects changed with different clones and test sites, reflecting the complexity and diversity of genotype-by-environment interactions. The clones with the best wind resistance at the three test sites were Y7, Y9, Y6 and Y15, which have great potential for popularization in coastal typhoon-prone areas. This study can provide valuable references for the selection, testing and popularization of eucalyptus clones to a certain extent.
