7个耐寒桉树的无性系区域试验

Regional Experimentation on Seven Clones of Cold-resistant Eucalyptus

在福建中亚热带开展7个桉树无性系的区域试验研究.结果表明:巨桉3号速生性、适应性和耐寒性强,生长量高,稳定性较好,可耐-4.0～-4.5℃的低温,DH 201-2、巨桉1号和DH 184-1生长量较高,速生性、适应性和抗逆性较强,稳定性好,可耐-3.5～-4.0℃的低温,这4个无性系适合在福建中亚热带年平均温度19℃以上的不同区域选择应用;柳窿桉9号速生性中等,耐寒性有限,只可耐-2.0～-2.5℃的低温,而赤桉1号和赤桉3号虽耐寒性强,可耐-5℃的低温,但速生性差、产量低,且这3个无性系的变异性大,稳定性差,适应范围窄,作为短周期工业原料林不提倡在该区发展.

A contrasted investigation was conducted on 7 clones of cold-resistant Eucalyptus in the mid-subtropics of Fujian. The results show that the adaptability, fast-growth and cold-resistance of E. grandis №3 are strong, the growth increment is high, the stability is better, and it can endure a low temperature of -4.0--4.5 ℃ ; that the adaptability, fast-growth and cold-resistance of E. grandis №1, DH184-1 and DH201-2 were stronger, their yield is higher, ther stability is excellent, and they can bear a low temperature of -3.5--4. 0℃ ; and that these 4 clones were suitable to be selected for planting on Fujian mid-subtropical areas of an average temperature above 19℃. The results also show that the fast-growth of E. saligna×E. exserta №9 is generic, its resistance to cold is limited, and it can only bear a low temperatures of -2.0--2.5 ℃ ; that the cold-resistance of E. camaldulensis №1 and №3 is strong, with a -5℃ temperature endurance, but their fast-growth is poor and yields are low; and that the variability of these three clones is big, their stability is not good, their adaptive area is narrow, and they are not advised to plant on the areas of mid-subtropical Fujian.