ESTABLISHMENT OF STAND DENSITY CONTROL DIAGRAM FOR POPLAR IN LINGYI PREFECTURE, SHANDONG PROVINCE

Data of 356 temporary sample plots of intensively cultivated poplar plantations (Populus deltoides cv."Lux" I-69/55) were collected for establishment of stand density control diagram.The densities of poplar plantation ranged from 278 to 5952 plants per ha..Among all 317 sample plots, the densities are ranging from 500 to 1894 plants per ha., accounting for 89.1%.The dominant height varied from 5.9 to 28.6m, the average D.B.H.3.8-28.6cm, the volume per ha.3.9-339.7m.The formularsused are as follows:1/M=A1+B1·1/N for equivalant height curve,1/D=A2+B2·N for equivalent diameter curveMRf=K2·NRfK1'for full density curve,MRy=K3·NRyK1' for density control curve.The accuracy of the stand density control diagram is 97.6 for equivalent height curve, 98.9% for equivalent diameter curve.