北京林业大学学报2024，Vol.46Issue(8)：101-110,10.DOI:10.12171/j.1000-1522.20230086
内蒙古大兴安岭林区白桦天然林单木胸径生长模型构建
Construction of individual tree DBH growth models for natural Betula platyphylla forests in Daxing'an Mountains,Inner Mongolia of northern China
摘要
Abstract
[Objective]In order to accurately predict growth and formulate adaptive management measures for natural Betula platyphylla forests in Daxing'an Mountains,Inner Mongolia of northern China,a mixed-effects individual-tree DBH growth model of Betula platyphylla,including climatic factors and tree size diversity factors,was developed.[Method]The data were derived from the 8th and 9th national forest inventory in Daxing'an Mountains of Inner Mongolia,including a total of 97 fixed sample plots and 4785 sample tree observations of Betula platyphylla. Based on the selected data,the traditional growth model of individual-tree DBH was constructed by stepwise regression method. Then,sample plot effects were added to construct individual-tree mixed-effects model of Betula platyphylla. Finally,we validated the basic model and the mixed-effects model by 10-fold cross-validation method.[Result]The logarithm of initial DBH,basal area of trees larger than the subject tree,standard deviation of DBHs,growth accumulation temperature and mean annual precipitation had significant effects on individual-tree DBH growth of Betula platyphylla.Compared with basic model,R2adj of final mixed-effects model increased by 0.1206,and the root mean square error decreased by 0.0971 cm2,respectively. The prediction accuracy of the mixed-effects model improved significantly. The results of 10-fold cross-validation indicated that the mixed-effects model also showed a better fitting result.[Conclusion]The individual-tree DBH growth mixed-effects model of Betula platyphylla including climatic factors and tree size diversity factors can accurately predict the DBH growth of individual trees,which can provide support for scientific management of natural Betula platyphylla forests in Daxing'an Mountains,Inner Mongolia of northern China.关键词
森林管理/模型构建/白桦天然林/单木胸径生长/气候因子/林木大小多样性因子/线性混合效应模型Key words
forestry management/model buildings/Betula platyphylla natural forest/individual-tree DBH growth/climatic factors/tree size diversity factor/linear mixed-effects model分类
农业科技引用本文复制引用
马浩,曹元帅,吕延杰,徐干君,何友均,王建军..内蒙古大兴安岭林区白桦天然林单木胸径生长模型构建[J].北京林业大学学报,2024,46(8):101-110,10.基金项目
国家自然科学基金面上项目(31570633). （31570633）
