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Forest Science Database

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Abstract

Stable carbon isotope ratios (δ13C) in tree rings have been increasingly used as indicators of climatic and ecological processes. However, compared to inter-annual δ13C variability, the factors related to inter-tree and -site variability (i.e., dendroclimatic noise) have attracted less attention....

Author(s)
Helama, S.; Arppe, L.; Hyvönen, J.; Mielikäinen, K.; Oinonen, M.
Publisher
The Geochemical Society of Japan, Tokyo, Japan
Citation
Geochemical Journal, 2018, 52, 4, pp 287-298
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
AbstractFull Text

Tree-ring data is commonly used in forest science and dendrochronology. As the collected datasets represent restricted populations of theoretical infinite sample size, an interesting question deals with the sample selection that is carried out during the fieldwork and through the data analyses....

Author(s)
Timonen, M.; Mielikäinen, K.; Helama, S.
Publisher
Institute of Forestry and Rural Engineering, Estonian Agricultural University, Tartu, Estonia
Citation
Forestry Studies / Metsanduslikud Uurimused, 2012, 56, pp 5-15
Abstract

The climate conditions of the current and previous growing seasons have been shown to influence growth of coniferous trees in mineral soils sites. These dependencies may be different in peatlands where growth is generally more dependent on variations in soil water conditions. In the Nordic and...

Author(s)
Hökkä, H.; Salminen, H.; Ahti, E.
Publisher
Elsevier GmbH, München, Germany
Citation
Dendrochronologia, 2012, 30, 2, pp 157-165
Abstract

The common growth signal and spatial synchrony of nine chronologies of tree rings (Pinus sylvestris L.) from the Baltic Sea region were studied using moving correlations with time windows of 50 and 100 years. Drifts from synchrony to asynchrony and again back to synchrony across several centuries...

Author(s)
Läänelaid, A.; Helama, S.; Kull, A.; Timonen, M.; Jaagus, J.
Publisher
Elsevier GmbH, München, Germany
Citation
Dendrochronologia, 2012, 30, 2, pp 147-155
Abstract

Dendroclimatic investigations of subfossil Scots pine (Pinus sylvestris) from two raised bogs in southern Sweden yielded a continuous floating 1492-year long tree-ring record. By cross-dating with bog-pine chronologies from Lower Saxony, Germany, the South Swedish record was assigned an absolute...

Author(s)
Edvardsson, J.; Leuschner, H. H.; Linderson, H.; Linderholm, H. W.; Hammarlund, D.
Publisher
Elsevier GmbH, München, Germany
Citation
Dendrochronologia, 2012, 30, 2, pp 93-103
Abstract

This article presents for the first time Scots pine tree-ring chronology created from historical timber (XVII-XIX cc.) from central Belarus. The chronology includes 59 tree-ring series which were collected from the different wood structures in the Nesvizh castle. This samples show different stages...

Author(s)
Yermokhin, M.
Publisher
Elsevier GmbH, München, Germany
Citation
Dendrochronologia, 2012, 30, 2, pp 69-72
Abstract

This proceedings comprises 14 papers presenting the usefulness of dendrochronology in providing information on scientific questions about the past and to help prepare for the future. These papers focused on growth ring chronology of different trees, indicators of mid-Holocene climate variability,...

Author(s)
Helama, S.; Devall, M. S.
Publisher
Elsevier GmbH, München, Germany
Citation
Dendrochronologia, 2012, 30, 2, pp 67-194
Abstract

The mortality of Scots pine trees in and around Helsinki has been reported in recent years, but the causalities of these deaths have not so far been rigorously examined. Tree-ring analyses have previously shown to effectively reveal historical growth variability and thus hint at the stress factors...

Author(s)
Helama, S.; Läänelaid, A.; Raisio, J.; Tuomenvirta, H.
Publisher
Springer-Verlag GmbH, Berlin, Germany
Citation
Trees: Structure and Function, 2012, 26, 2, pp 353-362
Abstract

This study presents the results of a dendrochronological and dendroclimatological study of Scots pine growth on dry sites in Estonia and Finland. Increment cores from two regions in Estonia and from five regions in Finland are used. The cores were collected from living trees nearby permanent...

Author(s)
Hordo, M.; Henttonen, H. M.; Mäkinen, H.; Helama, S.; Kiviste, A.
Publisher
Lithuanian Forest Research Institute (Lietuvos Misku Institutas), Kaunas, Lithuania
Citation
Baltic Forestry, 2011, 17, 1, pp 35-49, 163

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