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中文摘要：
为探求便捷有效的小面积城市森林三维绿量的测算方法，根据林木生长的分形原理，采用逐步回归方法获取了沈阳城市森林三维绿量的13个模拟方程，并对其影响因素进行分析．结果表明：13个模拟方程的决定系数（R^2）在0．612～0．842，残差分析没有呈现明显图样，模型精度均在87％（α=0．05）和83％（α=0．01）以上，其中最便捷的模拟方程是ln Y=7．468＋0．926lnx1[Y为模拟三维绿量，x1为每公顷胸高断面积（SDB）]．模拟方程的标准回归系数与16个树木特征间的相关关系显示，影响沈阳城市森林三维绿量的最主要因素是每公顷胸高断面积（SDB）．
英文摘要：
Based on the fractal theory of forest growth, stepwise regression was employed to pursue a convenient and efficient method of measuring the three-dimensional green biomass （TGB） of urban forests in small area. A total of thirteen simulation equations of TGB of urban forests in Shenyang City were derived, with the factors affecting the TGB analyzed. The results showed that the coefficients of determination （R^2） of the 13 simulation equations ranged from 0. 612 to 0. 842. No evident pattern was shown in residual analysis, and the precisions were all higher than 87% （α= 0. 05） and 83% （α =0. 01 ）. The most convenient simulation equation was ln U=7.468 ＋0. 926 lnx1, where Y was the simulated TGB and x1 was basal area at breast height per hectare （SDB）. The correlations between the standard regression coefficients of the simulation equations and 16 tree characteristics suggested that SDB was the main factor affecting the TGB of urban forests in Shenyang.
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