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      Boreal forest health and global change

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      American Association for the Advancement of Science (AAAS)

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          Changes in forest productivity across Alaska consistent with biome shift.

          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. © 2011 Blackwell Publishing Ltd/CNRS.
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            Mapping the World's Intact Forest Landscapes by Remote Sensing

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              Mapping U.S. forest biomass using nationwide forest inventory data and moderate resolution information

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                Journal
                10.1126/science.aaa9092

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