© 1990 Heron Publishing—Victoria, Canada
Climate change and forests
David M. Gates
Biological Station and Department of Biology, University of Michigan, Ann Arbor, MI 48109-1048, USA /
Summary
Factors governing long-term change in global temperature are reviewed. The magnitude and rate of change in global temperature
resulting from current increases in the concentration of atmospheric greenhouse gases are considered in relation to their
impact on forests. Movement in forest zone boundaries at a rate of 2.5 km year–1 are possible, which is nearly ten times the rate forests have been known to move by natural reproduction. Climate models
indicate that increased global temperature will affect rainfall distribution, lead to more frequent and more severe storms
and increase climatic variability. Consequences for the world’s forests include increased frequencies of fire and blow-down,
and wide-spread decline. Increased atmospheric CO2 concentrations may increase forest growth where the effect is not offset by reduced precipitation, but the overall effect
of anticipated changes in global climate is likely to be widespread loss of forests.
