Study on Differentiation of Betula alnoides Plantation

The DBH,height and stand volume of Betula alnoides individuals in the plantations of 4,7 and 16 years old were analyzed,the result showed that the extreme differences of DBH among individuals of 4,7 and 16 years old were 6.17 cm,12.82 cm and 15.00 cm respectively,the rangs of stand volume of stand 7-year-old individuals reached 0.136 92 m3.The results of hierarchical cluster analysis indicated that the DBH subset ranges were 6.17 cm,12.82 cm and 12.90 cm for the 4,7 and 16-year-old B.alnoides plantations,respectively;the volume subset range for the 7-year-old stand was 45.860 12 m3/hm2.These results revealed that intrinsic properties of great growth differentiation between stand individuals involving the properties presented in juvenile stands within B.alnoides plantations established by seeding seedlings.The study was also showed the information of feasibilities on tree improvement and early selection,which suggests the significance of developing B.alnoides clonal forestry.