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应用Ｌｉ－３０００Ａ叶面积仪测定了８个无性系的叶型及叶面积指标，选择了８个模型，以叶片主脉长（Ｌ）和最大宽（Ｗ），以及两者乘积（Ｌ×Ｗ）为三个变量作与叶面积的相关关系分析，筛选出复相关系数均达０．９５以上的最佳模型为：（１）与两者乘积的叶面积模型：ｌｇＹ＝ａ＋ｂｘ＋ｂ＋ｃｌｇｘ，（２）与最大宽度的模型：Ｙ＝ａ＋ｂｘ＋ｃｘ２。但与叶片主脉长模拟效果较差。此外，还得出了杨树无性系的叶面积通用模型，即：Ｙ＝—０．４５０８２６十０．０００７１Ｘ＋０．９７６３３５ｌｇｘ（ｘ为Ｌ×Ｗ），和Ｙ＝—１．６９７３８７十０．７３３４９７ｘ—０．００１２５３ｘ２（ｘ为Ｗ）。上述８个无性系及杨树通用的模型的建立为叶面积的计算、预测等生理生态研究提供了科学依据，使得叶面积测定更加省时、可靠和方便。
The leaf area and leaf area index of eight clones were determined by Li-3000A leaf-surface-plotter. Eight models were selected and the main pulse length (L) and maximum width (W) and the product of the two ) For the three variables and leaf area of the correlation analysis, screening out the correlation coefficient of 0.95 or more for the best model are: (1) and the product of the two leaf area model: lgY = a + bx + b + clgx, (2) Model with maximum width: Y = a + bx + cx2. However, the simulation results are not as good as those of leaf main pulse. In addition, a general leaf area model for poplar clones was derived, ie Y = -0.450826 x 0.00071X + 0.976335lgx (x is L x W) and Y = -1.697387 x 0.733497x- 0.001253x2 (x is W). The establishment of the above eight clonal and poplar models provides a scientific basis for the physiological and ecological research of leaf area calculation and prediction, which makes the determination of leaf area more time-saving, reliable and convenient.