Reduced growth of Alaskan white spruce in the twentieth century from temperature-induced drought stress
Document Type: Journal Article
Author(s): Valerie A. Barber; Glenn P. Juday; Bruce P. Finney
Publication Year: 2000

Cataloging Information

  • carbon
  • climate change
  • forest
  • global warming
  • growth
  • Picea glauca
  • stand age
  • temperature
  • white spruce
Record Maintained By:
Record Last Modified: February 15, 2018
FRAMES Record Number: 3516


The extension of growing season at high northern latitudes seems increasingly clear from satellite observations of vegetation extent and duration. This extension is also thought to explain the observed increase in amplitude in seasonal variations in atmospheric CO2 concentration. Increased plant respiration and photosynthesis both correlate well with increases in temperature this century and are therefore the most probable link between the vegetation and CO2 observations. From these observations, it has been suggested that increases in temperature have stimulated carbon uptake in high latitudes and for the boreal forest system as a whole. Here we present multi-proxy tree-ring data (ring width, maximum late-wood density and carbon-isotope composition) from 20 productive stand of white spruce in the interior of Alaska. The tree-ring records show a strong and consistent relationship over the past 90 years and indicate that, in contrast with earlier predictions, radial growth has decreased with increasing temperatures. Our data show that temperature-induced drought stress has disproportionately affected the most rapidly growing white spruce, suggesting that, under recent climate warming, drought may have been an important factor limiting carbon uptake in a larger portion of the North American boreal forest. If this limitation in growth due to drought stress is sustained, the future capacity of northern latitudes to sequester carbon may be less than currently expected.

Online Link(s):
Barber, Valerie A.; Juday, Glenn P.; Finney, Bruce P. 2000. Reduced growth of Alaskan white spruce in the twentieth century from temperature-induced drought stress. Nature 405(6787):668-673.