雷州半岛桉树无性系选择及其早期综合评价

通过对27个3年生不同桉树无性系的几个主要性状进行调查，运用比较、方差分析、相关分析等方法，分析不同无性系主要性状的种间差异以及各性状间的相互关系。结果表明：不同地点立地条件、不同桉树无性系的年均蓄积量差异极显著，两者之间存在极显著的交互作用。干形指标与其产量存在极显著的负相关；树高、胸径之间存在显著的表型和遗传相关；通过干形指标和无约束指数选择法，综合评定了各无性系的生长表现，选出ECl、CH3、CH1等18个表现优良的无性系。

The Variation of Main Properties of Different Eucalyptus Clones and the Synthetical Evaluation

The several main properties of 27 three years old clone of eucalyptus were investigated, which were related to the yield. In the process of analyzing the different properties which influence the yield, some methods were used, such as comparison, variontion analysis and relationship analysis. The results showed that there was relationship between the yield and the main properties; there are significant difference and genetic relation among the properties, such as Height and DBH; DBH is the properties which most closely related to the yield, with the index of stem form and unlimited index choose method, the synthetical properties of respect clone were evaluated and excellent clones such as EC1 CH3 CH1 was picked out.