Journal
TREES-STRUCTURE AND FUNCTION
Volume 26, Issue 3, Pages 777-788Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00468-011-0645-8
Keywords
Radial growth; Redundancy analysis (RDA); Climate change; Self-calibrating Palmer drought severity index; Tree size
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Funding
- EU [226544]
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The climate sensitivity of radial growth in European beech (Fagus sylvatica L.) was analyzed within a narrow valley in the Swabian Alb (southwestern Germany). We collected stem disks from three aspects (NE, NW and SW) of trees belonging to different social classes. Common climatic factors limiting growth across the valley were identified using a principal component analysis (PCA). Further, we performed hierarchical cluster analysis (HCA), redundancy analysis (RDA) and bootstrapped correlation analysis to reveal differences in chronologies and climate-growth relationships between aspect and social class. Climatic variables considered in our analyses were monthly and seasonal data on temperature and precipitation, as well as a self-calibrating Palmer drought severity index (sc-PDSI). We identified drought in the period June-August as the most prominent factor limiting growth across the valley. Dominant and co-dominant trees at the NW and SW aspects were found to be particularly drought sensitive, whereas intermediate trees were less susceptible to drought. Underlying causes of established climate-growth relationships are discussed in the context of drought susceptibility, tree-size modulation and tree physiological processes.
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