Changes in forest productivity across Alaska consistent with biome shift

Pieter S.A. Beck, Glenn P. Juday, Claire Alix, Valerie A. Barber, Stephen E. Winslow, Emily E. Sousa, Patricia Heiser, James D. Herriges, Scott J. Goetz

Research output: Contribution to journalArticlepeer-review

233 Scopus citations

Abstract

Global vegetation models predict that boreal forests are particularly sensitive to a biome shift during the 21st century. This shift would manifest itself first at the biome's margins, with evergreen forest expanding into current tundra while being replaced by grasslands or temperate forest at the biome's southern edge. We evaluated changes in forest productivity since 1982 across boreal Alaska by linking satellite estimates of primary productivity and a large tree-ring data set. Trends in both records show consistent growth increases at the boreal-tundra ecotones that contrast with drought-induced productivity declines throughout interior Alaska. These patterns support the hypothesized effects of an initiating biome shift. Ultimately, tree dispersal rates, habitat availability and the rate of future climate change, and how it changes disturbance regimes, are expected to determine where the boreal biome will undergo a gradual geographic range shift, and where a more rapid decline.

Original languageEnglish (US)
Pages (from-to)373-379
Number of pages7
JournalEcology Letters
Volume14
Issue number4
DOIs
StatePublished - Apr 2011
Externally publishedYes

Keywords

  • Boreal forests
  • Drought
  • Evergreen forests
  • Global warming
  • High latitudes
  • NDVI
  • Productivity
  • Remote sensing
  • Tree rings

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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