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小叶章（Ｄｅｙｅｕｘｉａａｎｇｕｓｔｉｆｏｌｉａ）为三江平原的代表植物，也是优良的饲用植物，文章应用分形理论的方法，探讨了三江平原典型草甸小叶章种群地上生物量与株高的关系，揭示其地上生物量的积累和空间分布规律及生长过程。结果表明：两者之间存在分形特征，具有自相似规律。在６～９月其分形维数Ｄ值分别为１１６９、１６７４、２０６５、１８４３；在整个生长季其Ｄ值为１７３０。说明小叶章种群生物量积累及其空间分布是一个分形生长过程，服从Ｄ值规律增长。其成熟植株可看做是生长初期植株经生长放大而形成的。
Deyeuxia angustifolia is a representative plant in the Sanjiang Plain and an excellent forage plant. Based on the fractal theory, the paper discusses the relationship between aboveground biomass and plant height of Populus simonii population in the Sanjiang Plain, and reveals that aboveground biomass Accumulation and spatial distribution and growth process. The results show that there is a fractal feature between the two, which has a self-similar rule. The fractal dimension values of D were 1169, 1674, 2065, 1843 respectively from June to September. The D value was 1.73 in the whole growing season. The results indicated that the biomass accumulation and its spatial distribution of Populus simonii population was a fractal growth process and obeyed the rule of D value growth. The mature plants can be seen as the initial growth of plants grown by the growth and formation.