Relationship between Diameter at Breast Height and Tree Age in Populations of a Rare and Endangered Plant, Davidia involucrata

IF 0.4 4区 环境科学与生态学 Q4 ECOLOGY
Ruijun Su, Qinggui Wu, Yu-lian Yang, Tingxing Hu
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引用次数: 2

Abstract

ABSTRACT The growth rate of the diameter of trees is significantly correlated with their age; therefore, a growth model can be established to predict the dynamics of the population. To reveal the relationship between individual age and diameters at breast height (DBH) of D. involucrata,five populations were chosen in the largest distribution area of D. involucrata in Sichuan province. Dendrochronology and regression model was used to evaluate the distribution of the DBH and its relationship with the age, respectively. All 130 D. involucrata trees recorded in the studied plots, with the minimum DBH of 3.8 cm, and the maximum of 45.5 cm, corresponding to the minimum age of 4 years and the maximum age of 98 years. The results showed that in the first 11 DBH classes (DBH < 22 cm), the tree DBH increases relatively slowly with the growth of the age. After the 11th DBH class, the DBH class increases slowly with increasing tree age. The tree age exceeds 20 years, the increase in the DBH growth rates with tree age is similar among the five populations. The linear models were fitted to determine the regression equation for the DBH growth curve of D. involucrata, which can be well described by a parabolic model. Under normal forest stand development and growth conditions, the model can be widely applied to study the ages of individual D. involucrata.
珍稀濒危植物珙桐种群株高直径与树龄的关系
摘要:树木直径的生长速率与树龄呈极显著相关;因此,可以建立一个增长模型来预测种群的动态。为了揭示珙桐个体年龄与胸径(DBH)的关系,在四川省珙桐最大的分布区选取了5个种群。采用树木年代学和回归模型分别评价了胸径分布及其与年龄的关系。研究样地共记录到130株珙桐,最小胸径为3.8 cm,最大胸径为45.5 cm,最小树龄为4年,最大树龄为98年。结果表明:在前11个胸径级(胸径< 22 cm),随着树龄的增长,胸径增长相对缓慢;第11胸径级以后,随着树龄的增加,胸径级的增长缓慢。当树龄超过20年时,5个种群的胸径增长率随树龄的增长基本一致。通过拟合线性模型,确定了珙桐胸径生长曲线的回归方程,该曲线可以用抛物线模型很好地描述。在正常林分发育和生长条件下,该模型可广泛应用于珙桐单株年龄的研究。
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来源期刊
Polish Journal of Ecology
Polish Journal of Ecology 环境科学-生态学
CiteScore
1.10
自引率
0.00%
发文量
9
审稿时长
18-36 weeks
期刊介绍: POLISH JOURNAL OF ECOLOGY (formerly Ekologia polska) publishes original scientific research papers dealing with all aspects of ecology: both fundamental and applied, physiological ecology, evolutionary ecology, ecology of population, community, ecosystem, landscape as well as global ecology. There is no bias regarding taxons, ecosystems or geographical regions.
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