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Forest Science Database

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Abstract

Tree-ring chronologies are commonly extended back in time by combining samples from living trees with relict material preserved in man-made structures or natural archives (e.g. lakes). Although spatially close, these natural archives and living-tree-sites often comprise different micro-climates....

Author(s)
Düthorn, E.; Schneider, L.; Konter, O.; Schön, P.; Timonen, M.; Esper, J.
Publisher
Finnish Society of Forest Science, Helsinki, Finland
Citation
Silva Fennica, 2015, 49, 1, pp 1220
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 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

Reindeer (Rangifer tarandus) lichen grazing enhanced Scots pine (Pinus sylvestris) growth in a northeastern Fennoscandian forest (eastern Finnish Lapland). Lichen mat removal by grazing in a previously ungrazed area increased soil versus air temperature coupling. This caused faster soil spring...

Author(s)
Fauria, M. M.; Helle, T.; Niva, A.; Posio, H.; Timonen, M.
Publisher
National Research Council of Canada, Ottawa, Canada
Citation
Canadian Journal of Forest Research, 2008, 38, 12, pp 2981-2993
Abstract

For a long time, tree-rings have been thought of as containing almost no variation at timescales of centuries and millennia, i.e. at low frequencies. Here, we show that this might be an issue of data analysis rather than an actual lack of variability. A data set of subfossil and living Scots pines...

Author(s)
Helama, S.; Timonen, M.; Lindholm, M.; Meriläinen, J.; Eronen, M.
Publisher
John Wiley & Sons, Chichester, UK
Citation
International Journal of Climatology, 2005, 25, 13, pp 1767-1779
Abstract

This work seeks to analyse the importance of summer-temperatures on the tree-ring growth of Scots pine (Pinus sylvestris L.) during the past three centuries. Three living-tree chronologies, subfossil pine chronology and one composite tree-ring chronology were constructed from latitudinal and...

Author(s)
Helama, S.; Holopainen, J.; Timonen, M.; Ogurtsov, M. G.; Lindholm, M.; Meriläinen, J.; Eronen, M.
Publisher
Istituto Italiano di Dendrocronologia, Verona, Italy
Citation
Dendrochronologia, 2004, 21, 3, pp 147-154
Abstract

This study, initiated in 2001, aimed to describe the past forest fire events in the Urho Kekkonen National Park in eastern Lapland, Finland, with as good spatial and temporal resolution as possible. Scots pine [Pinus sylvestris] was the dominant tree species in the study area except in the upper...

Author(s)
Kauhanen, H.; Lehtonen, H.; Ovaskainen, R.; Timonen, M.
Publisher
Estonian Agricultural University, Tartu, Estonia
Citation
Transactions of the Faculty of Forestry, Estonian Agricultural University, 2004, No.37, pp 97-99
Abstract

We performed a spatiotemporal analysis of a network of 21 Scots pine (Pinus sylvestris) ring-width chronologies in northern Fennoscandia by means of chronology statistics and multivariate analyses. Chronologies are located on both sides (western and eastern) of the Scandes Mountains (67°N-70°N,...

Author(s)
Macias, M.; Timonen, M.; Kirchhefer, A. J.; Lindholm, M.; Eronen, M.; Gutiérrez, E.
Publisher
Institute of Arctic and Alpine Research, Boulder, USA
Citation
Arctic, Antarctic, and Alpine Research, 2004, 36, 4, pp 565-574
Abstract

Midsummer (July) temperatures are reconstructed for the last 7500 years using the long ring-width chronology of Scots pine (Pinus sylvestris) from northern Finland. The chronology was built using regional curve standardization (RCS), which allows for long term (low-frequency) variability to be...

Author(s)
Helama, S.; Lindholm, M.; Timonen, M.; Meriläinen, J.; Eronen, M.
Publisher
Arnold, London, UK
Citation
Holocene, 2002, 12, 6, pp 681-687
Abstract

This paper reviews the development of the current 'supra-long' pine (Pinus) chronology for northern Finnish Lapland. In the forest-tundra ecotone region of northern Finnish Lapland over 250 samples from living Scots pines (Pinus sylvestris) and over 1700 samples of subfossil pines have been...

Author(s)
Eronen, M.; Zetterberg, P.; Briffa, K. R.; Lindholm, M.; Meriläinen, J.; Timonen, M.
Publisher
Arnold, London, UK
Citation
Holocene, 2002, 12, 6, pp 673-680

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