The results show that greatly heavy thinning and heavy thinning can effectively increase stand growth in diameter increment and yield of large-diameter timber,reduce cultivation time for large-diameter timber.

Based on the analysis of market prospect and significance of large -diameter timber,afforestation skills and management model of large-diameter timber of eucalyptus were put forward by giving full play to the trilateral adva ntage of forest land.

For large-diameter timber of eucalyptus cultivation,experiment is conducted as followings: Five kinds of plant density were set as the main area,with another five kinds of fertilizer amount being secondary area.

Fine varieties are basis of cultivating orientedly big-diameter timber of Cunninghamia lanceolata.

Using Jing an County as an example,this paper puts forward the sustainable management pattern of Chinese Fir for big-diameter timber at the level of management for the first time.

Thinning,one of the breeding technologies of eucalyptus big-diameter wood,and its economic effects were studied.

Based on the data collected from 24 sample plots in the stand of Chinese fir big diameter wood, the optimal stand density model of mobile thinning interval for Chinese fir big diameter wood plantation was built by using continuous dynamic programming, which could be used to guide density controlling for cultivating big diameter wood of Chinese fi