【摘要】 为了掌握大果山楂（Malus doumeri）幼苗生长节律，以9个大果山楂优株幼苗为材料，对其苗高、地径进行观测，评定其幼苗质量，对幼苗生长期进行划分，使用Logistic模型拟合幼苗生长曲线。结果表明，5和8号幼苗苗高、地径较优。Logistic模型对大果山楂苗高和地径的拟合度分别为0.995、0.987；苗高生长拐点为9.84月龄，拐点生长量为65.25 cm；地径生长拐点为7.94月龄，拐点生长量为4.19 mm；拟合效果显著。根据实际调查及拟合结果，将大果山楂苗木苗高和地径生长划分为3个时期，分别为苗高生长前期（10月15日—次年4月15日）、速生期（4月15日—8月15日）和生长后期（8月15日—10月15日）及地径生长前期（10月15日—次年2月15日）、速生期（2月15日—6月15日）和生长后期（6月15日—10月15日）。更多还原

【Abstract】 In order to understand growth rhythm of Malus doumeri seedlings, taking seedlings of 9 superior plants of M. doumeri as materials, seedling height and ground diameter were observed to evaluate quality of seedlings and divide growth period of seedlings. Logistic model was used to fit growth curve of seedlings. Results showed that heights and ground diameters of No.5 and No.8 seedlings were better than the others. Fitting degrees of Logistic models for height and ground diameter were of seedling 0.995 and 0.987. Inflection point of height was 9.84 months and increment was 65.25 cm. Inflection point of ground diameter was 7.94 months and increment was 4.19 mm. Fitting effect was good. According to actual investigation and fitting results, height and ground diameter growths of M. doumeri seedlings were divided into three stages. Pre-growth stage, rapid growth stage and late growth stage of height were October 15 to April 15 of next year, April 15 to August 15 and August15 to October 15. Pre-growth stage, rapid growth stage and late growth stage of ground diameter were October15 to February 15 of next year, February 15 to June 15 and June 15 to October 15.更多还原