Study on the Mechanism of Producing High Quality Wood of Chinese Fir

The data from 44 temporary plots and 52 fixed plots of 17～25 years old Cunninghamia lanceolata plantations in Jiangxi Province were used to study the influence of site,age and reserved density on the wood property of C. lanceolata. The results showed that the dominant factor influencing the formation of middle and large dimension wood is site,followed by reserved density and cultivation duration.It is suitable to cultivate middle dimension wood when the site index is no less than 16,the reserved density is 1 050～1 350 trees per hectare,and the age of tree is between 20～22 years old. For cultivating large dimension wood,the management density should be lower and the cultivation duration should be longer.