, Volume 64, Issue 1-2, pp 365-383

The transient response of vegetation to climate change: A potential source of CO2 to the atmosphere

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Abstract

Global climate change as currently simulated could result in the broad-scale redistribution of vegetation across the planet. Vegetation change could occur through drought-induced dieback and fire. The direct combustion of vegetation and the decay of dead biomass could result in a release of carbon from the biosphere to the atmosphere over a 50- to 150-year time frame. A simple model that tracks dieback and regrowth of extra-tropical forests is used to estimate the possible magnitude of this carbon pulse to the atmosphere. Depending on the climate scenario and model assumptions, the carbon pulse could range from 0 to 3 Gt of C yr−1. The wide range of pulse estimates is a function of uncertainties in the rate of future vegetation change and in the values of key model parameters.