天目山常绿阔叶林胸高断面积生长量影响因子研究  

Study on the factors affecting breast-height basal area increment of evergreen broad-leaved forest in Mount Tianmu

作　　者：窦啸文 吴登瑜 张笑菁 汤孟平[1,2] DOU Xiaowen;WU Dengyu;ZHANG Xiaojing;TANG Mengping(State Key Laboratory of Subtropical Silviculture,Zhejiang A&F University,Hangzhou 311300,Zhejiang,China;College of Environment and Resources,Zhejiang A&F University,Hangzhou 311300,Zhejiang,China;College of Forestry and Biotechnology,Zhejiang A&F University,Hangzhou 311300,Zhejiang,China)

机构地区：[1]浙江农林大学省部共建亚热带森林培育国家重点实验室,浙江杭州311300 [2]浙江农林大学环境与资源学院,浙江杭州311300 [3]浙江农林大学林业与生物技术学院,浙江杭州311300

出　　处：《浙江农林大学学报》2023年第5期1063-1072,共10页Journal of Zhejiang A&F University

基　　金：国家自然科学基金面上资助项目(31870617)。

摘　　要：【目的】研究常绿阔叶林胸高断面积生长模型,探究影响胸高断面积生长量的因素,为常绿阔叶林经营提供理论依据。【方法】以天目山常绿阔叶林为对象,先对胸高断面积生长量与胸径、竞争和地形因子进行相关性分析,随后对不同径级、冠幅等级和竞争等级的胸高断面积生长量进行差异性分析,最后基于岭回归分析法,建立以胸高断面积生长量对数为因变量的单木生长模型,定量描述胸高断面积生长量与胸径、竞争和地形因子的关系。【结果】胸径、冠幅、竞争与胸高断面积生长量的斯皮尔曼(Spearman)相关系数分别为0.531、0.427、-0.340。林木胸高断面积生长量随着林木胸径的增大而增大,不同径级间差异极显著(P<0.01)。林木胸高断面积生长量随着林木冠幅的增大而增大,不同冠幅等级间差异极显著(P<0.01)。不同竞争等级的林木胸高断面积生长量差异极显著(P<0.01),且低度竞争时的林木胸高断面积生长量最大。基于径阶平均值的单木生长模型优于基于单株林木的单木生长模型,且2类模型中胸径因子的回归参数均达极显著水平(P<0.01)。【结论】在天目山常绿阔叶林中影响胸高断面积生长量的主要因子是胸径、冠幅和竞争指数。[Objective]The objective is to study the growth model of breast-height basal area of evergreen broad-leaved forest and to explore the factors affecting breast-height basal area increment(BAI)of evergreen broad-leaved forest,so as to provide a theoretical basis for evergreen broad-leaved forest management.[Method]Taking the evergreen broad-leaved forest in Mount Tianmu as the research object.Firstly,the correlation between BAI and diameter at breast height(DBH),competition and terrain factors were analyzed.Secondly,the differences of BAI among different diameter classes,crown diameter classes and competition classes were discussed.And finally,based on the ridge regression analysis,the individual tree growth model with logarithm of BAI as the dependent variable was established to quantitatively describe the relationship between BAI and DBH,competition and terrain factors.[Result]The Spearman’s correlation coefficients between BAI and DBH,crown diameter,and competition were 0.531,0.427 and−0.34 respectively.BAI was extremely significant different among trees of different diameter classes (P<0.01), and increased with increase of DBH. There was a significant difference (P<0.01) in BAI among trees with different competition classes, and trees with low competition level had the largest BAI. Individual tree growth models based on average diameter grade were superior to those based on individual tree, and the regression parameters of DBH in both types of models were extremely significant (P<0.01). [Conclusion] In the evergreen broad-leaved forest of Mount Tianmu, the main factors affecting BAI are DBH, crown diameter and competition index.

关 键 词：常绿阔叶林 胸高断面积生长量 竞争指数 岭回归分析 生长模型 

分 类 号：S757[农业科学—森林经理学]