Studies on the Stand Density and Site Effect of I 69 Poplar Plantation for Plywood

Taking developing plywood as the main objective,the relationship between average individual tree volume i.B.and stand dominant height and between average individual tree volume i.B.and silviculture density on Ⅰ 69 poplar (Populus deltoides Bartr.cv.‘Lux’) plantation was studied.Taking selected silviculture density and stand dominant height as independent variable,fitted models of average individual tree volume i.B.V=a0Na1 H0a2 for the stand of respective stand age from 6 to 11.With the elasticity of production and marginal production analysis,the silviculture density effect and stand dominant height effect and the amount of the elasticity of production and the marginal production were studied.In addition,based on the effect models of the stand site and silviculture density,the stand volume effected by silviculture density,stand age and site index were also studied.The research indicated that when the I 69 poplar plantation was cultivated for plywood,silviculture density should be lowered down properly.The optimum silviculture density is 156 or 204 trees/ha.And when selecting the land be used for cultivation,the site index of the land should be equal to or more than 20 m in the region of the middle reaches and the lower reaches of the Changjiang River.