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Extramural Research

Grantee Research Project Results

NCER Grantee Research Project Results

Succession and Carbon Dynamics of Boreal Permafrost Peatlands During Rapid Climate Warming

EPA 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)
Research Category: Academic Fellowships , Ecological Indicators/Assessment/Restoration , Fellowship - Ecology and Ecosystems

Description:

Objective:

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.

Approach:

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.

Supplemental Keywords:

fellowship, climate warming, permafrost peatlands, ecosystem, peat accumulation, succession, successional dynamics, permafrost formation, thaw, Manitoba, Canada, ecosystem dynamics., RFA, Scientific Discipline, Air, INTERNATIONAL COOPERATION, Geographic Area, climate change, Air Pollution Effects, Environmental Monitoring, International, Country & Regional Programs, Atmosphere, Global Climate Change, carbon sequestration, biodiversity, climatic influence, consequences of vegetation change, Canada, climate variability, peat accumulation

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The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.

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