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Forest Science Database

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Abstract

Cross-dating is considered one of the most important principles of dendrochronology. The first known cross-dating attempts, conducted between the years 1737 and 1783 by independent researchers in France, Germany, and Sweden, were related to the identification of growth rings believed to have formed ...

Author(s)
Norrgård, S.; Helama, S.
Publisher
NRC Research Press, Ottawa, Canada
Citation
Canadian Journal of Forest Research, 2020, 51, 2, pp 267-273
Abstract

Urban trees growing in roadside locations encounter stressful impacts in terms of atmospheric and soil conditions and mechanical damage. Here, a set of lime trees from a roadside location in Helsinki was analysed for their radial growth and tree-ring width variability in relation to climate...

Author(s)
Helama, S.; Läänelaid, A.; Raisio, J.; Sohar, K.; Mäkelä, A.
Publisher
Elsevier GmbH, Munich, Germany
Citation
Urban Forestry & Urban Greening, 2020, 53,
AbstractFull Text

In this study, an Estonian tree-ring network of Norway spruce (Picea abies (L.) H.Karst.), originating from both living trees and dead wood of construction wood, was used for determining the growth variations over the past 350 years (AD 1657-2009). Regional curve standardization was used to remove...

Author(s)
Läänelaid, A.; Helama, S.; Eckstein, D.
Publisher
Institute of Dendrology, Polish Academy of Sciences, Kórnik, Poland
Citation
Dendrobiology, 2015, 73, pp 145-152
Abstract

Tree-ring data of individual trees show lifelong biological trends as a function of cambial age. The compilation of a tree-ring chronology entails standardization (detrending) of the series. Tree-ring standardization commonly derives detrended series of dimensionless tree-ring data that are devoid...

Author(s)
Helama, S.
Publisher
Society of American Foresters, Bethesda, USA
Citation
Forest Science, 2015, 61, 5, pp 817-828
Abstract

Twentieth-century summer (July-August) temperatures in northern Finland are reconstructed using ring widths, maximum density and stable carbon isotope ratios (δ13C) of Scots pine tree rings, and using combinations of these proxies. Verification is based on the coefficient of determination (r2),...

Author(s)
McCarroll, D.; Tuovinen, M.; Campbell, R.; Gagen, M.; Grudd, H.; Jalkanen, R.; Loader, N. J.; Robertson, I.
Publisher
John Wiley & Sons, Chichester, UK
Citation
Journal of Quaternary Science, 2011, 26, 1, pp 7-14
Abstract

Tree-ring chronologies provide high-resolution late Quaternary palaeoclimatic data. An important aim of tree-ring research is to extend the chronologies back in time, before the period covered by old living trees. Tree-ring material from historic buildings offers an opportunity to develop long...

Author(s)
Helama, S.; Bartholin, T. S.
Publisher
Sciendo, Warsaw, Poland
Citation
Acta Palaeobotanica, 2019, 59, 1, pp 131-143
Abstract

Tree growth at northern boreal treelines is generally limited by summer temperature, hence tree rings serve as natural archives of past climatic conditions. However, there is increasing evidence that a changing summer climate as well as certain micro-site conditions can lead to a weakening or loss...

Author(s)
Lange, J.; Buras, A.; Cruz-García, R.; Gurskaya, M.; Jalkanen, R.; Kukarskih, V.; Seo JeongWook; Wilmking, M.
Publisher
Frontiers Media S.A., Lausanne, Switzerland
Citation
Frontiers in Plant Science, 2018, 9, November, pp 1597
Abstract

Latitudinal and altitudinal gradients can be utilized to forecast the impact of climate change on forests. To improve the understanding of how these gradients impact forest dynamics, we tested two hypotheses: (1) the change of the tree growth-climate relationship is similar along both latitudinal...

Author(s)
Lyu LiXin; Suvanto, S.; Nöjd, P.; Henttonen, H. M.; Mäkinen, H.; Zhang QiBin
Publisher
Copernicus Gesellschaft mbH, Gottingen, Germany
Citation
Biogeosciences, 2017, 14, 12, pp 3083-3095
Abstract

Tree-ring maximum latewood density (MXD) records from Fennoscandia have been widely used to infer regional- and hemispheric-scale mean temperature variability. Here, we explore if MXD records can also be used to infer past variability of summer temperature extremes across Fennoscandia. The first...

Author(s)
Zhang Peng; Ionita, M.; Lohmann, G.; Chen DeLiang; Linderholm, H. W.
Publisher
Springer Berlin, Heidelberg, Germany
Citation
Climate Dynamics, 2017, 49, 7/8, pp 2721-2736
Abstract

Norway spruce (Picea abies (L.) H. Karst.) is predicted to decrease its abundance in the Eastern Baltic region as a result of climatic changes, and this process is already explicit at the southern limit of species lowland distribution. Still, there are uncertainties about the growth potential of...

Author(s)
Matisons, R.; Elferts, D.; Krišāns, O.; Schneck, V.; Gärtner, H.; Wojda, T.; Kowalczyk, J.; Jansons, Ā.
Publisher
MDPI AG, Basel, Switzerland
Citation
Forests, 2021, 12, 6,

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