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通过Logistic方程数学模拟和有序聚类分析,对19年生I-69杨的材积生长规律进行研究。I-69杨材积生长表现出明显的“慢—快—慢”的生长节律,用Logistic方程拟合效果好(R=0.994 68,P<0.000 1)。结果表明:I-69杨的生长过程可分为:缓苗期、生长初期、速生期和生长后期4个时期;聚类分析生长进程的结果与Logistic方程拟合结果基本吻合,进一步验证了利用Logistic方程拟合生长规律的可行性。按照材积各生长时期划分结果,速生期仅8~9年,但速生期生长量占总生长量的比率却很大,为64.68%~71.30%,生产中应重点加强速生期树木的管理,以期降低生产经营成本,最大限度地促进树木生长。
The volume growth of 19-year-old I-69 poplar was studied by logistic equation mathematical modeling and ordered cluster analysis. The growth of I-69 poplar showed obvious “slow-fast-slow” growth rhythm. Logistic equation fitted well (R = 0.994 68, P <0.000 1). The results showed that the growth process of I-69 was divided into four stages: early seedling stage, early growing stage, fast growing stage and late growing stage. The result of cluster analysis of growth process was basically consistent with Logistic equation fitting result, Logistic equation to fit the feasibility of growth. According to the volume of the growth period of the division results, the fast-growing period of only 8 to 9 years, but the rapid growth of the total growth rate of the amount of growth rate is large, 64.68% ~ 71.30%, production should focus on strengthening the management of fast-growing trees, Reduce production and management costs, to maximize the growth of trees.