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Corpus Systématique Végétale

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Responses of the circumpolar boreal forest to 20th century climate variability

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  • boreal forest
  • climate change
  • dendrochronology
  • tree rings
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  • Andrea H Lloyd 1,2
  • Andrew G Bunn 3
  • 1) Department of Biology, Middlebury College, Middlebury, VT 05753, USA
  • 2) Author to whom any correspondence should be addressed
  • 3) Department of Environmental Sciences, Huxley College of the Environment, Western Washington University, Bellingham, WA, USA

We examined relationships between tree ring-width and climate at 232 sites around thecircumpolar boreal forest to explore variability in two types of response to temperature: abrowning response characterized by inverse correlations between growth and temperature,and a greening response characterized by positive correlations between growth andtemperature. We used moving-window correlation analysis for eight 30-year timewindows, lagged by 10 years, to characterize the climate response at each sitefrom 1902 to 2002. Inverse growth responses to temperature were widespread,occurring in all species, all time periods, and in nearly all geographic areas. Thefrequency of the browning response increased after 1942, while the frequency of thegreening response declined. Browning was concentrated in five species (Picea abies,Picea glauca, Picea mariana, Picea obovata and Pinus banksiana), and occurredmore frequently in the warmer parts of species ranges, suggesting that directtemperature stress might be a factor. In some species, dry sites were also more likely toexperience browning; moisture stress might thus be an additional explanation insome cases. As inverse responses to temperature are widespread, and occur in abroad array of species, there is unlikely to be any single explanation for theiroccurrence.

Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
Catégories Scopus
  • 1 - Health Sciences ; 2 - Medicine ; 3 - Public Health, Environmental and Occupational Health
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - General Environmental Science
  • 1 - Physical Sciences ; 2 - Energy ; 3 - Renewable Energy, Sustainability and the Environment
Catégories WoS
  • 1 - science ; 2 - meteorology & atmospheric sciences
  • 1 - science ; 2 - environmental sciences
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Environmental Research Letters

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