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Abstract

Background: Dynamic Global Vegetation Models (D GVMs) compute the terrestrial carbon balance as well as the transient spatial distri bution of vegetation. We study two scenarios of moderate and strong climate change (2.9 K and 5.3 K temperature increase over present) to investigate the spatial redistribution of major vegetation types and their carbon balance in the year 2100. Results: The world's land vegetation will be more de ciduous than at present, and contain about 125 billion tons of additional carbon. While a recession of the boreal fore st is simulated in some areas, along with a general expansion to the north, we do not observe a reported collapse of the central Amazonian rain forest. Rather, a decrease of biomass and a change of vegetation type occurs in its northeastern part. The ability of the terrestrial biosphere to sequester carbon from the atmosphere declines strongly in the second half of the 21 st century. Conclusion: Climate change will cause widespread shifts in the distribution of major vegetation functional types on all continents by the year 2100