Abstract:

The results proved that Manglietia yuyuanensis was an excellent broadleaved tree species with fast growth rate, high-quality stem form, less diseases and pests and higher wood density.And after slower early growth period, M.yuyuanensis begin to enter a rapid growth phase of stemwood at 10 years old. Individual stemwood of M.yuyuanensis at age 16 was nearly as three times as Chinese-fir, suggesting that interplant with Chinese fir would be a effective way of cultivating high-quality and large-diameter broadleaved wood. Because of marked stem forking, it was important for cultivating high-quality stemwood of M.yuyuanensis to remove or prune sprouts in time. The results indicated that hill slope was a major site factor affecting stemwood growth of M.yuyuanensis in the mountain areas in South China with lower elevation. Gentle slope means deeper soil and better site, resulting in greater stemwood and longer clear bole height. There existed some trend of great height and DBH growth for M.yuyuanensis planting lower position and semi-shade (or semi-sun) aspect.Based on the mechanism of stemwood cultivation, initial planting density and M.yuyuanensis trees per hectare should be reduced properly and higher ratio of Chinese fir to M.yuyuanensis adopted in order to cultivate longer clear bole height and large-diameter broadleaved wood.

Key words: Manglietia yuyuanensis, Cunninghamia lanceolata, High-quality stemwood, Mixed stand cultivation