翅荚木苗期生长模型及其生长参数研究

Studies on Mathematical Model and Parameters for the Growth of Zenia insignis

以翅荚木3个不同种源为研究对象，对其苗期生长量进行测定，采用Logistic方程拟合其苗高和地径生长规律，建立生长模型，并根据拟合曲线的相关系数求相应种源的苗期物候和生长参数，进行比较分析。结果表明：利用Logistic方程可较好地拟合翅荚木种源苗期生长的动态变化，其相关系数在0．9971～0．9992之间，达到极显著相关；3个种源的地径线性生长期和生长速率差异不大，但苗高线性生长期差异较大，湖南通道种源明显小于其它2个种源8～9d；苗高线性生长量不同种源间也存在一定的差异，湖南通道种源为108．6753cm，广西苹果种源为119．8689cm，而广东翁源种源高达130．8458cm，是湖南通道种源的120．40％。

Three provenances of Zenia insignis were used as materials in this study. The growth quantity at the seedling stage was measured, the pattern of seedling height and basal diameter was developed by Logistic equation, and mathematical model for their growth was established. Based on the related coefficient of stimulant curve, the phonological period and growth parameters were counted, compared and analyzed. The results showed that the dynamic changes of Zenia insignis seedling growth could be developed by Logistic equation, and the decisive coefficients varying from 0. 997 1 to 0. 999 2 were significantly related. There was no significant difference between growth period and growth velocity of the basal diameter of the three Zenia insignis provenances, whereas there was a remarkable difference in the linear growth period, eg. which of Tongdao, Hunan was 8 to 9 days later than that of the other two provenances. The linear growth quantity of seedling height varied among different provenances, eg. 108. 675 3 cm for Tongdao, Hu＇ nan, 119. 868 9 cm for Pingguo, Guangxi,and 130. 845 8 cm for Shaoguan, Guangdong.