25个桉树无性系生长量及抗风性研究

Study on increment and wind-resistance of 25 Eucalyptus clones

根据不同地区25个桉树无性系的生长状况和抗性表现,对比分析其保存率、胸径、树高、材积、蓄积量和抗风性。结果表明:L9、H5、UT28和华桉2号的保存率经过5年仍保持在90%以上;以5年生的群体生长量均值为标准,树高、胸径、材积均高于群体均值的无性系有UT26、华桉2号、UT28、U27、UT6、华桉1号、广9、U23、H9、H5、L10、U28和L9;抗风性表现较好的无性系有UT8、华桉1号、华桉2号、ZU6、UT6、UT28和广9。对上述因子进行主成分及聚类分析,UT6、华桉2号、UT28、广9和U27综合表现最好,可以为速生、抗性强的桉树无性系选育提供参考;H10、U36、H1和L3的表现最差,不适合在雷州半岛种植。

According to the growth status and resistance performance of 25 Eucalyptus clones in different regions,a comparative analysis of the preserving rate,diameter,height,volume,growing stock and wind-resistance was carried out. The results showed that the preserving rate of clones L9,H5,UT28 and ‘Huaan 2＇ were still above 90% after 5 years. Taking the average population growth at 5-years age as standard,clones UT26,‘Huaan 2＇,UT28,U27,UT6,‘Huaan 1＇,‘Guang 9＇,U23,H9,H5,L10,U28 and L9 had higher diameter,height and volume than the average population growth;clones UT8,‘Huaan 1＇,‘Huaan 2＇,ZU6,UT6,UT28 and ‘Guang 9＇ had strong wind resistance. Based on the above factors ,the result of principle component analysis （PCA） and cluster analysis showed that the comprehensive performances of clones UT6,‘Huaan 2＇,UT28,‘Guang 9＇,and U27 were the best,which could provide a reference for breeding of Eucalyptus clones with fast-growing and strong resistance. Clones H10,U36,H1 and L3 were the worst,which were not suitable for planting in Leizhou peninsula of China.