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采用生物数学方法，研究了柚木育苗密度与小棒槌苗的生长、棒槌状主根段的形成、单位面积苗木产量与质量等关系。用指数函数、幂函数、对数函数等１０种曲线方程，建立了３５个数学模型以描述其复杂的关系。经分析揭示出：（１）在一定的育苗密度下，土壤肥力较高的尖峰点，苗木地上、地下部分生长与产苗量远不如土壤肥力低的广州点，其差距随密度的增大而增大，主因是点间水热协调性质与日照长短的差异所致；（２）依不同地点生态因素的差异来调控育苗密度，以提高苗木产量和质量远比在同一地点延长育苗时间更为有效；（３）调控好育苗的最适密度，就可取得最好的苗木产量与质量。尖峰点和广州点适宜的育苗密度分别为１００～２００株／ｍ２与３００～４００株／ｍ２。两地相差约３～４个密度级（５０株／ｍ２为Ⅰ级）。
Bio-mathematics method was used to study the relationship between seedling density of teak and growth of Mallard seedlings, the formation of clubhead root segments, the yield and quality of seedlings per unit area. With exponential function, power function, logarithmic function and other 10 kinds of curve equations, 35 mathematical models were established to describe their complex relations. The analysis revealed that: (1) Under certain seedling density, the peak of soil fertility was high, the growth and seedling production of seedling above and below the ground was much less than that of Guangzhou with low soil fertility. As the density increased Increase, mainly due to the difference between the hydrothermal coordination of the nature and the length of the sunshine; (2) According to the ecological factors in different locations to regulate the nursery density differences in order to improve nursery stock yield and quality far more than in the same place to extend the nursery time more Effective; (3) regulate the optimal density of nursery, you can get the best seedling yield and quality. The suitable seedling density of spikes and Guangzhou points are 100-200 plants / m2 and 300-400 plants / m2, respectively. Differences between the two about 3 to 4 density level (50 / m2 for the first grade).