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采用Ｌｏｇｉｓｔｉｃ曲线模拟胡杨７个无性系苗期年生长动态，估测了其日生长速率的最大值和速生期的２个拐点及长度。结果表明：胡杨各无性系间苗高与地茎的阶段性生长有着显著的差异
Logistic curves were used to simulate the annual growth dynamics of Populus euphratica at seven clones. The maximum daily growth rate and two inflection points and length of fast growing stage were estimated. The results showed that there was a significant difference in the staging of the seedling height and the stems and stems of Populus euphratica