The research of effect of different age of stand and density of sand Pinus svlvestris var.mongolica artificial forest of Liaoning Zhanggutai on height growth
The height annual increment of different age of stand and density were observed and analyzed by taking Pinus svlvestris var.mongolica artificial forest of Liaoning Zhanggutai as object.The result showed that the optimum density of maximum annual increment of 10, 20, 30, 40, 50, 60 years were 1 425, 1 175, 1 175, 750, 650, 450 plant per hectare.The optimum density of maximum annual increment presented deline tendency along with the increase of age of stand.It existed significant difference among height annual increment of 6 different age-class and same age-class different density of 10~60 years, P<0.05.
Liaoning Zhanggutaisand Pinus svlvestris var.mongolicadifferent age of standdifferent densityheight annual increment