Rereading a tree-ring database to illustrate depositional histories of subfossil trees
Helama, S., Luoto, T., Nevalainen, L., & Edvardsson, J. (2017). Rereading a tree-ring database to illustrate depositional histories of subfossil trees. Palaeontologia Electronica, 20(1), Article 2A. https://doi.org/10.26879/696
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Palaeontologia ElectronicaDate
2017Copyright
© 2017 Palaeontological Association. This is an open access article distributed under the terms of a Creative Commons License.
Late Quaternary tree-ring chronologies have been constructed using data collected
from subfossil trees preserved under favourable conditions in lake sediments
and peat deposits. Tree-ring widths and densities are commonly used for reconstructions
of past climate variability. An alternative way of using these data is to explore the
replication curves of these chronologies. Here, we make use of previously collected
data that is currently available from tree-ring databases to demonstrate the depositional
histories of pine trees once accumulated into the sediment in lake (i.e., riparian
trees) and peatland sites. Divergent courses of depositional histories were obtained for
different sedimentary settings in southern Finland. Accumulation of peatland pines was
high, but that of riparian trees was low around 1.0 ka during the Medieval Climate
Anomaly (MCA). By contrast, the accumulation of peatland pines declined towards the
Little Ice Age (LIA), while that of riparian trees increased, with a culmination around 0.7
ka. We interpret these variations to mean transitional environmental changes in the
corresponding habitats and to indicate increased precipitation and a rising water table
from MCA towards the LIA. These results demonstrate the relative roles of recruitment
and preservation potentials, and thus of palaeoecological and taphonomic processes,
in controlling the tree accumulation in peatland and lake environments, respectively.
We conclude that subfossil tree-ring chronologies, even those extracted from electronic
databases, can provide important insights into palaeoecology, furnishing new
perspectives on palaeoclimate, palaeohydrology of lakes and peatlands, and for studying
the tree population responses to past climatic changes.
...
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Coquina PressISSN Search the Publication Forum
1935-3952
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http://palaeo-electronica.org/content/2017/1735-depositional-historiesPublication in research information system
https://converis.jyu.fi/converis/portal/detail/Publication/26541918
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Except where otherwise noted, this item's license is described as © 2017 Palaeontological Association. This is an open access article distributed under the terms of a Creative Commons License.
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