Dendroclimatic signals of pedunculate oak (Quercus robur L.) in Estonia |
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Authors: | Kristina Sohar Alar Läänelaid Dieter Eckstein Samuli Helama Jaak Jaagus |
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Affiliation: | 1. Department of Geography, Institute of Ecology and Earth Sciences, University of Tartu, Vanemuise 46, 51014, Tartu, Estonia 2. Centre of Wood Sciences, Section Wood Biology, University of Hamburg, Leuschnerstr. 91, 21031, Hamburg, Germany 3. Finnish Forest Research Institute, Northern Unit, P.O. Box 16, 96301, Rovaniemi, Finland
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Abstract: | This study investigates the climate impact on the radial increment of pedunculate oak (Quercus robur L.) in Estonia at the species’ northern distribution limit. Tree-ring width series of 162 living oaks were compiled into three regional chronologies—western (1646–2008), northeastern (1736–2011), and southeastern Estonia (1912–2011). Although these regional growth patterns are similar to each other and even to the growth patterns in adjacent regions, spatial differences in growth responses to climate were established. Thus, oaks growing on shallow soil in western Estonia are positively influenced by summer (June–August) precipitation, and oaks on the deeper soil in northeastern Estonia are favoured by June temperature, while oaks in the southeastern part of the country depend on both July precipitation and temperature. These relationships are pronounced especially in pointer years. However, due to the impact of regional weather fluctuations on tree growth, there is a lack of correspondence between the local and the pan-European pointer years. In addition, our research presents the first tree-ring-based palaeoclimatic reconstruction for the country. Although the created model has relatively low predictive skill describing less than a quarter of the variance in actual summer precipitation in western Estonia, it has passable capacity of detecting past rainfall extremes. |
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