Growth Comparison Of Different Clones In Liuwan Forest Farm

This paper based on Liuwan forest farm production practice, according to the local natural attribute, planting area conditions, adhere to the law suitable trees in suitable varieties, good varieties, scientific planning and management, sustainable development, the principle of reasonable layout. Liuwan forest farm will introduce more varieties of eucalyptus clones, giving full play to the genetic characteristics and advantages of eucalyptus clones and growth potential. And in the process of large-scale construction of eucalyptus timber stands, the choice of different eucalyptus clones in regional trial is the premise. Through the selection of regional test, selecting eucalyptus clones were varieties suitable for local forestation, within the scope of the forestry better targeted to nurture and diversified development and utilization. This paper is finding out a theoretical basis and scientific reference way through the comparison test which of the 5 clones (Guang Lin-9, DH32-29, DH32-26, DH32-28, DH33-9) growth traits in 4 years. The main conclusion as follow:1. Analyses data at the age of 1-year from 5 eucalypt clones established at Liuwan forest farm. Results from the 5 eucalypt clone showed that there were significantly differences in the height. In the 6 month, the mean highest tree of Guiping branch was DH33-9, which reached 2.06m. In the 8 month, the mean highest tree of Gaoling branch was DH32-9, which reached 3.03m.2. Analyses data at the age of 2-years from 5 eucalypt clones established at Liuwan forest farm. Results from trial showed that there were significantly differences in growth trains among the 5 clones tested. In the 18 month, the mean highest tree of Guiping branch was DH32-9, which reached 11.0m.The second one was DH33-9.Optimal for Mean DBH, individual tree volume, volume was DH33-9,reaches 7.88cm、0.0304m3 and 46.16m3/hm23/hm2, which individual tree volume and volume priority ranked as DH33-9>DH32-29> DH32-28> Guanglin-9> DH32-26. In the 20 month, the mean highest tree of Gaoling branch was DH33-9, which reached 11.56m. Optimal for Mean DBH, individual tree volume, volume was DH33-9,reaches 8.59cm> 0.0369m3 and 55.97m3/hm23. Volume priority ranked as DH33-9> DH32-29> DH32-28> DH32-26>Guanglin-9.3. Analyses data at the age of 3-years from 5 eucalypt clones established at Liuwan forest farm. Results from trial showed that there were significantly differences in growth trains among the 5 clones tested. In the 30 month, the mean highest tree of Guiping branch was DH32-29, which reached 15.43m.The second one was DH33-9,which reached 15.29m.Optimal for Mean DBH, individual tree volume, and volume was DH33-9,reaches 11.28cm、0.0777m3 and 115.13m3/hm23/hm2, which individual tree volume and volume priority ranked as DH33-9>DH32-29>Guanglin-9>DH32-28>DH32-26. In the 32 month, optimal for Mean DBH, H, individual tree volume, and volume was DH33-9 of Gaoling branch, reaches 15.21m、11.15cm、0.0774m3 and 110.94m3/hm2. DBH, individual tree volume and volume priority ranked as DH33-9>DH32-26>DH32-28>Guanglin-9> DH32-29.4. Analyses data at the age of 4-years from 5 eucalypt clones established at Liuwan forest farm. Results from trial showed that there were significantly differences in growth trains among the 5 clones tested. In the 42 month, optimal for Mean H, DBH, individual tree volume, and volume was DH33-9 of Guiping branch, which reaches 17.01m、13.28cm、0.1151m3 and 168.24m3/hm2.H, DBH, individual tree volume and volume priority ranked as DH33-9> DH32-29> DH32-28> Guanglin-9> DH32-26. In the 44 month, optimal for Mean H, DBH, individual tree volume, and volume was DH33-9 of Gaoling branch, reaches 16.85m、13.20cm、0.1140m3 �'� 162.64m3/hm2. Individual tree volume and volume priority ranked as DH33-9>DH32-26> DH32-28> DH32-29>Guanglin-9.5. Analyses data at the age of 4-years from 5 eucalypt clones established at Liuwan forest farm. Results from trial showed that the height of average annual increment was increased before the 2 years, but it was decreased stably at the third year. Meanwhile the current annual increment was decreased at the first time. On the other hand, DBH of average annual increment ant current annual increment was decreased stably at the first time. Average annual increment of individual tree volume and volume was increased stably, but the current annual increment was decreased stably.