Abstract:

The effects of planting density on growth and economic benefit of Masson Pine plantation were analyzed by using the data obtained year by year during 11 years from the experiment stand (including treatments of A,B,C,D, their planting density is 1 667, 3 333, 5 000, 6 667 trees5hm -2 respectively), the results showed that it had significant effects on stand growth, stand structure and mill run. With the increase of planting density, diameter at breast height(DBH), single tree volume, crown diameter, ratio of crown length to tree height decreased, but growing stock, tree height/DBH, self_thinning intensity increased, stand total mill run, trees percentage of small logs and mill run of small timber increased, and first thinning time was earlier. The planting density had no significant effect on tree height. Mill run of C and D was more 34.0%, 43.0% than that of A respectively. By a synthetic analysis of mill run, the cost of production and output value, planting density of cultivating short rotation industry timber could be determined as 3 333～5 000 trees5hm^-2-2,/SUP.

Key words: Pinus massoniana, Planting density, Density effects, Economic analysis, Mill run