国槐胸径生长模型研究

Study On Tree Breast-Height Diameter Growth Model for Sophora Japonica in Hefei city

以合肥市的国槐为研究对象,对安徽农业大学校园内生长稳定的国槐进行调查和采集资料,选择Richards、logistics、Gompertz、韦布尔、S曲线、二次曲线6种理论生长方程,在DPS中分别建立胸径与年龄的相关关系,并对拟合效果进行对比分析。结果表明:除S曲线相关系数R小于0.90外,其它方程拟合的相关系数均高于0.98;与其他方程相比,Richards方程更能准确描述国槐的胸径生长特性,更适合于建立国槐的胸径生长模型。最佳方程为:X_2=45.9999/((1+2.0658*EXP(-0.108270*X_1))^(1/0.336217))。

In this paper,taking Sophora japonica in Hefei as objectives,based on the survey of Sophora japonica in Anhui Agricultural University which were stabled growth,six growth equations were utilized to establish the correlation between age and DBH in DPS.The fitting effects of these equations were compared.It was found that R of growth model established with each equation was more than 0.98 except S-curve equation,which was less than 0.90;Richards equations fitted the correlation between DBH and age best.The best model was：X_2 = 45.9999 /（（1 ＋ 2.0658＊ EXP（-0.108270＊ X_1）） ^（1 /0.336217）） 。