湖北引种滇楸优良无性系早期选择

为增加湖北江汉平原用材林树种多样性，缓和该地区用材林种单一问题，以引种栽培的滇楸雄性不育系为材料，连续3年对30个无性系进行胸径和树高性状测定，通过方差分析及遗传参数比较对优良无性系进行早期选择。结果表明：1 年生滇楸无性系平均胸径和树高为2.49 cm 和2.94 m，2 年生为4.29 cm和4.22 m，3 年生达到6.31 cm和6.06 m；方差分析结果显示，不同无性系间胸径和树高的差异均达到极显著水平；3 年生的胸径、树高重复力分别为63.89%和67.48%；不同林龄胸径和树高相关性均达到极显著水平；以胸径和树高为指标，采用加权系数选择指数法对不同无性系进行评价，筛选出4 个优良滇楸无性系，入选率为12.5%。

Early Stage Selection of Fine Clones of Catalpa fargesii f. duclouxii in Hubei Province

Aim to increase the diversity of timber tree species and ease the timber single issue in Jianghan plain of Hubei Province, the introduction and early stage selection of 30 male-sterile clones of Catalpa fargesii f. duclouxii were conducted. Based on the measurement traits of tree diameter at breast height and tree height for 3 years in succession, the analysis of variance and comparison of genetic parameters were carried out. The results showed that the average diameter and height for 1 year old clones of Catalpa fargesii f. duclouxii were 2.49 cm and 2.94 m, for 2 years old they were 4.29 cm and 4.22 m, and for 3 years old they were 6.31 cm and 6.06 m, respectively. An extremely significant variation of growth was found among clones based on the results of ANOVA. The repeatability of diameter and height for the 3rd year were 63.89% and 67.48%, respectively. The correlations between diameter and height at different ages were extremely significant. 4 fine clones were chosen with the selection rate of 12.5% based on the integrated assessment by weighted coefficient method.