扬州市古树名木树龄及其形态特征相关关系研究

Study on the Correlation between the Age and Their Morphological Characteristics of Ancient and Famous Trees in Yangzhou City

古树名木是宝贵的自然和文化遗产,为深入认知其生长规律,通过实地调查,运用统计学、回归模型对扬州市主城区主要的古树名木形态特征关系进行了分析。结果表明:扬州市主城区有9种树,其树龄与胸径的相关性显著。曲线拟合可知,古树胸径随着树龄的增长先急剧增加再缓慢下降,曲线呈反“J”型,其中古树龄在100~200 a时胸径增长速率最大。通过使用一元、曲线和多元方程对树龄和形态特征关系进行拟合和比较,总结出用于描述不同形态指标之间的拟合模型。

Ancient and famous trees are valuable natural and cultural heritage.To deeply understand their growth rules,this research analyzed the characteristics relationship of the main ancient and famous trees in the urban area of Yangzhou City using statistical and regression models,based on field investigation.The results showed that there are nine main tree species,and the correlation between tree age and the diameter at breast height(DBH)was relatively significant.The curve fitting showed that the DBH of the tree increases sharply with the increase of age,and then decreased slowly,showing inverse"J"shape.The growth rate of DBH was the largest at 100-200a.By fitting and comparing the relationship between tree age and morphological characteristics using the univariate,curve and multivariate equations,the fitting models for describing different morphological indicators were summarized.