Relationships among DBH, Crown Width & Stand Age of Pinus sylvestris var.mongolica Plantation in Sand Land
The stand age,DBH,crown diameter & branch height of 10-60-year-old Pinus sylvestris var.mongolica plantation were investigated,observed and measured with SPSS in Horqin sandy land.Result shows that DBH growth and height of branches under Pinus sylvestris var.mongolica plantation have a significant correlation with stand age.The crown width have significant correlation with stand age,and there is a significant correlation between growth increment,And the increase with age,site conditions,differences may extend or shorten the process,but will not change this trend.The model of DBH,crown size & branch height under different stand age is;y=e0.75 + 3.212 / x,y =-0.085 + 0.344x-0.008 x2,y =e2.942-57.681 / x,respectively.;the model of ratio of crown width and diameter under different stand age is y =0.382 73 e-0.012 55 x.It revealed the law of growth of indices (DBH and crown width) changed with the stand age.
Pinus sylvestris var.mongolica on sandy landplantationstand ageDBHcrown widthbranch height
NETL
NSTL
万方数据
维普
