小叶白蜡为奇数羽状复叶，常由5～13片小叶组成。通过大样本取样测量，分析了不同小叶数复叶的表型可塑性及其各构件大小之间的关系。结果表明：小叶白蜡叶轴长和复叶长在不同复叶之间的可塑性较大，其差异大多数均达到了显著水平（ p＜0．05），而在各复叶内的可塑性较小，其变异系数均小于10％；小叶长和小叶宽在不同复叶之间的可塑性较小，其差异大多数均不显著，而在各复叶内的可塑性较大，其变异系数均大于20％。复叶长与叶轴长、复叶长与复叶宽均为对数函数或指数函数的异速生长型，小叶长与小叶宽既有幂函数关系的异速生长型，又有直线关系的同速生长型，各构件在复叶生长过程中的相对生长快慢可通过各函数的性质反映。%The compound leaves of Fraxinus sogdiana are imparipinnate with 5-13 leaflets.We studied the phenotypic plasticity on components of different compound leaves with various leaflet number, and analayed the relationship between the compo-nent sizes were analyzed.The plasticity was greater on length of both rachis and compound leaves among different com-pound leaves, the difference of most reached a significant level (p<0.05), and was less in each compound leaves, and the coefficient of variation was less than 10%.On the contrary, the plasticity was smaller on length and width of leaflets, and differences were mostly not significant among different compound leaves, but the plasticity was greater in compound leaves, and the variation coefficients were all greater than 20%.The relationship between the length of compound leaves and both rachis length, the length and the width of compound leaves was allometric growth type of logarithmic or exponential func-tion.However, there was allometric growth type of power function and linear isomeric growth type on the relationship be-tween length and width of leaflets.The relative growth rate of each component size during the process of growth could be described specifically by the parameters of correlation equation.
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