厚朴生长规律的研究

本文对厚朴人工林的生长规律进行了系统研究,建立了其栽培群体的各种生长模型。并运用灰色系统理论,对厚朴生长与气候条件的相关规律进行了探讨。结果表明,其树叶生长符合自然对数方程,树高和胸径年生长符合二次抛物线方程,模型参数与树龄相关;树高、胸径和材积生长规律均可用Logistic方程模拟,各自的速生期分别为4～11年、5～14年和10～17年;气温与降水、日照时数与气温是分别影响厚朴树高、胸径生长的主要气候因子,其影响程度随年龄的增长而减弱。决定厚朴生长和“厚朴”产量的结构因子主要是林分密度。

THE GROWTH PATTERNS OF Magnolia officinalis

The growth patterns of Magnolia officinalis plantations were systematically studied. Various growth models of the cultivated populations were established. Using the Grey System theory, we analyzed the interrelationship between the growth and the climatic factors. we found that the annual growth of the leaves accords with the logarithmic equation; the annual height growth and diameter growth at breast height. aecord with the parabola equation whose parameters are related to the tree age; the tree height, d, b. h. and volume increment can be simulated by the Logistic equation, their fast growing phases are from the 4th to 11th ,5th to 14th, and 10th to 17th year, respectively, the temperature and precipitation, the temperature and sunshine hours are primary climatic factors, affecting the height growth and d. b. h. growth, respectively, the affection intensity reduces with the increase of age. the stand density is the structural factor determining its growth and the yield of its bark, houpo.