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Johannes Edvardsson

Johannes Edvardsson

Forskare

Johannes Edvardsson

Impacts of regional climatic fluctuations on radial growth of Siberian and Scots pine at Mukhrino mire (central-western Siberia)

Författare

  • Guillaume Blanchet
  • Sébastien Guillet
  • Baptiste Calliari
  • Christophe Corona
  • Johannes Edvardsson
  • Markus Stoffel
  • Luca Bragazza

Summary, in Swedish

Ring width (TRW) chronologies from Siberian (Pinus sibirica) and Scots (Pinus sylvestris) pine trees were sampled at Mukhrino – a large mire complex in central-western Siberia – to evaluate the impacts of hydroclimatic variabil- ity on tree growth over the last three centuries. For this purpose, we compared climate-growth correlation pro- files from trees growing on peat soils with those growing on adjacent mineral soils. Tree growth at both peat and mineral soils was positively correlated to air temperature during the vegetation period. This finding can be ex- plained by (i) the positive influence of temperature on plant physiological processes (i.e. growth control) during the growing season and (ii) the indirect impact of air temperatures on water table fluctuations. We observe also a strong link between TRW and the winter Palmer Drought Severity Index (PDSI), especially in Siberian pine, reflecting the isolating effect of snow and limited freezing damage in roots. Significant negative relations were, by contrast, observed between bog TRW chronologies and hydroclimatic indices during spring and summer; they are considered an expression of the negative impacts of high water levels and moist peat soils on root devel- opment. Some unusually old bog pines – exhibiting N500 growth rings – apparently colonized the site at the beginning of the Little Ice Age, and therefore seem to confirm that (i) peat conditions may have been drier in Siberia than in most other regions of western Europe during this period. At the same time, the bog trees also point to (ii) their strong dependence on surface conditions.

Avdelning/ar

  • Kvartärgeologi
  • BECC: Biodiversity and Ecosystem services in a Changing Climate

Publiceringsår

2017-01-01

Språk

Engelska

Sidor

1209-1216

Publikation/Tidskrift/Serie

Science of the Total Environment

Volym

574

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Climate Research
  • Environmental Sciences

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1879-1026