期刊
DENDROCHRONOLOGIA
卷 27, 期 1, 页码 21-30出版社
ELSEVIER GMBH
DOI: 10.1016/j.dendro.2008.02.001
关键词
Central-West Germany; Cluster analysis; Dendroecology; Network analysis; Principal component analysis; Temporal stability
资金
- German Federal Environmental Foundation
Spatiotemporal variations in tree growth Lire induced by varying environmental conditions. Different methods like variants of the principal component analysis and the hierarchical cluster analysis are commonly applied in dendroecology to separate Subsets of growth patterns within large tree-ring datasets. To seek for methodological differences in classification techniques and their specific characteristics. we compared three standard methods Using a homogeneous oak (Quercus spp.) network from temperate forests in Central-West Germany. Classifications of the original dataset consisting of 46 oak ring-width sites, carried Out with the varimax rotated principle component analysis, Ward's method and the average linkage method, reveal differences in the classification of approximately 20% of the sites. Analyses with modified datasets are calculated to evaluate effects of dataset extension, different time periods and different tree-ring detrendings. The application of the principal component analysis generally leads to the most stable site classifications, whereas the most sensitive response to changes in the dataset is obtained by Ward's method. The average linkage method separates single sites in the classification and thus emphasises outliers within the tree-ring network. (C) 2008 Elsevier GmbH. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据