Dinerent tree species ,parent rock,soil,stand age,and snow injury are thefive factors that affect the occurrence rate of shoot dieback of exotic pines.The degree ofinfluence of these factors in terms of partial correlation coefficients follows the descending se-quence respectively,Tree species,parent rock,soil,stand age and planting quality compre-hensively affect the damage degree of the shoot dieback in terms of partial correlation coeffi-cients being in the descending sequence respectively The composite correlation coefficient ofeach factor with the occurrence rate is 0. 838 209 8.The compo...
