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目前,国内外的资料报导,树干直径与冠幅关系的回归方程,受林分密度的影响不显著,并与年令及地位级无关。据此,笔者搜集了我省的永吉、舒兰、磐石、东丰、蛟河等十四个县(市)153块标准地中的平均木和优势木冠幅资料387株。以冠幅(cw)为纵座标,直径(D)为横座标作图,依点的分布趋势,选用了方程。 Cw=D/a+bD 作为两者间相关关系的数学模型,为分析方便,令y=1/cw,x=1/D,则有y=b+ax
At present, the data at home and abroad reported that the regression equation between the trunk diameter and the crown width is not significantly affected by the stand density, and has nothing to do with the age order and status level. Accordingly, the author collected 387 strains of average wood and dominant wood crown in 153 standards of 14 counties (cities) of Yongji, Shulan, Rock, Dongfeng and Jiaohe in our province. To crown (cw) for the vertical axis, diameter (D) for the abscissa plot, according to the point of distribution trends, the choice of the equation. Cw = D / a + bD as the mathematical model of the correlation between the two, for the convenience of analysis, so that y = 1 / cw, x = 1 / D, then y = b + ax