Thinning Density about Pinus sylvestris Seed Trees
Fourteen main characters of the 40-year-old Pinus sylvestris vat. mongolica seed trees were analyzed after thinning treatments with different densities in Mengjiagang forest farm. Result shows that： forest thinning cause significant effects on many characters of Pinus sylvestris var. mongolica seed trees ;different traits have extremely complex correlation. Eight traits which exist significant differences ＆ correlation are divided into three categories （representing a growth, crown and seed traits） by using cluster analysis and principal component analysis. Weighting of scores and comparison of three classes of traits on each principal component show that the optimal thinning tending density of 40-year-old Pinus sylvestris var. mongolica seed trees in Mengjiagang forest farm are 150 trees · hm-2.
Pinus sylvestris var. mongolicaseed treethinning density
NETL
NSTL
万方数据
维普
