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Succession and Carbon Dynamics of Boreal Permafrost Peatlands During Rapid Climate WarmingEPA Grant Number: U914999
Title: Succession and Carbon Dynamics of Boreal Permafrost Peatlands During Rapid Climate Warming
Investigators: Camill, Philip
Institution: Duke University
EPA Project Officer: Broadway, Virginia
Project Period: January 1, 1996 through January 1, 1999
Project Amount: $102,000
RFA: STAR Graduate Fellowships (1996) RFA Text | Recipients Lists
Research Category: Academic Fellowships , Ecological Indicators/Assessment/Restoration , Fellowship - Ecology and Ecosystems
The objective of this research project is to determine how succession and peat accumulation respond to changes at the local scale resulting from permafrost thaw as opposed to regional-scale changes in climate, in boreal permafrost peatlands in Manitoba, Canada. Most ecosystems will probably exhibit complex dynamics during a rapid climatic warming because: (1) local factors mediate the effects of regional climate change on vegetation migration; and (2) changes in biodiversity impact ecosystem function.
I measured rates of two key successional processes, permafrost formation and thaw, as well as peat accumulation across a 4°C mean annual temperature gradient in northern Manitoba, Canada. For successional dynamics, local factors were more important controls of ecosystem dynamics than regional climate. Permafrost thawing was more rapid in warmer regions than in colder regions. However, shading by trees and the insulation properties of hummock-forming Sphagnum were sufficient to stop thawing. For permafrost formation, the local presence of tree cover was significantly more important than differences in regional climate. Peat accumulation decreased following permafrost thaw, largely because the loss of a single tree species, Picea mariana. These results suggest that local factors and species changes may control ecosystem dynamics more than the direct impact of regional climate warming over the course of the next century.