Preliminary afforestation effect of the mixed forest Betula alnoides in southern Fujian China

The tissue-cultured seedlings of Betula alnoides were introduced to plant in Wanshiqing Area of Fujian Hua'an Jinshan National Forest Farm and Beijing Area of Fujian Longhai Jiulongling National Forest Farm. B.alnoides was mixed with Castanopsis hystrix with 4 patterns in Wanshiqing Area, and mixed with Cunninghamia lanceolata with three patterns in Beijing Area. After one year the sample plots were set and each tree in the plots was investigated. The results showed the effects of the mix afforestation patterns to the growth of B. alnoides were significant difference in the early stage. The optimal pattern was the pure forest of B. alnoides with the best tree height and DBH. It was possible that the pure forest crowns closed after one year and created a small forest climate. The termites, crickets, Anoplophora chinensis and Batocera lineolata were found damaging to the B. alnoide in Wanshiqing Area, but not in Beijing Area.