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Beyond maximum density: multi-parameter insights into Scots pine climate sensitivity.

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Summary
This summary is machine-generated.

Climate sensitivity in Scots pine (Pinus sylvestris) has shifted, particularly in minimum density, impacting dendroclimatology. This study explores tree-ring density parameters to better understand climate change responses.

Keywords:
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Area of Science:

  • Dendrochronology and Climate Science
  • Ecology and Evolutionary Biology
  • Forestry and Environmental Science

Background:

  • Pinus sylvestris L. is a key species for Eurasian dendroclimatological reconstructions.
  • Traditional methods rely on tree-ring width (TRW) and maximum latewood density (MXD).
  • Climatic signals from earlywood/latewood density (EWD/LWD) and minimum density (MND) are under-explored.

Purpose of the Study:

  • To investigate the climate change response of multiple P. sylvestris tree-ring parameters.
  • To compare these responses at two contrasting sites in Scotland and Sweden.
  • To assess the skill of EWD/LWD and MND in dendroclimatological reconstructions.

Main Methods:

  • Analysis of well-replicated tree-ring density data from Scotland and Sweden.
  • Correlation analysis between tree-ring parameters (LWD, MXD, MND) and temperature data.
  • Investigation of temporal changes in climate-growth relationships.

Main Results:

  • LWD and MXD showed strongest correlations with temperature (0.5–0.7) for July, August, and the June-August season.
  • A significant negative correlation between MND and July temperatures was found in Swedish data, diminishing since the late 20th century.
  • Northern Scotland's site showed no comparable inverse MND-temperature signal, suggesting site-specific physiological changes.

Conclusions:

  • Climate sensitivity of P. sylvestris has changed, with shifts in minimum density.
  • The stability of MXD contrasts with changes in MND, highlighting the need for additional density parameters.
  • Altered tree growth sensitivity may reduce the effectiveness of proxies from northern European sites for climate reconstructions.