David Olefeldt

Biographic Data

ID6015895
NAMEDavid Olefeldt
GIVEN NAMESDavid
FAMILY NAMEOlefeldt
SIGNATUREOLEFELDT D
AFFILIATIONSUniversity of Alberta
ORCID0000-0002-5976-1475
VERIFIEDYes
TOTAL WORKS7
TOTAL CITATIONS4
WORKS AS AUTHOR7
WORKS AS EDITOR0
FIRST PUBLICATION YEAR2014
LATEST PUBLICATION YEAR2021
H-INDEX1

  • The missing pieces for better future predictions in subarctic ecosystems

    Open AccessYinan He, Didac Pascual et al.ARTICLEAMBIO2021References: 70

    Arctic and subarctic ecosystems are experiencing substantial changes in hydrology, vegetation, permafrost conditions, and carbon cycling, in response to climatic change and other anthropogenic drivers, and these changes are likely to continue over this century. The total magnitude of these changes results from multiple interactions among these drivers. Field measurements can address the overall responses to different changing drivers, but are les…

  • Shallow soils are warmer under trees and tall shrubs across Arctic and Boreal ecosystems

    Open AccessHeather Kropp, M M Loranty et al.ARTICLEEnvironmental Research Letters2020

    Soils are warming as air temperatures rise across the Arctic and Boreal region concurrent with the expansion of tall-statured shrubs and trees in the tundra. Changes in vegetation structure and function are expected to alter soil thermal regimes, thereby modifying climate feedbacks related to permafrost thaw and carbon cycling. However, current understanding of vegetation impacts on soil temperature is limited to local or regional scales and lack…

  • Increased deep soil respiration detected despite reduced overall respiration in permafrost peat plateaus following wildfire

    Open AccessCarolyn Gibson, Carolyn M Gibson et al.ARTICLEEnvironmental Research Letters2019

    Wildfire in boreal permafrost peatlands causes a thickening and warming of the seasonally thawed active layer, exposing large amounts of soil carbon to microbial processes and potential release as greenhouse gases. In this study, conducted in the discontinuous permafrost zone of western Canada, we monitored soil thermal regime and soil respiration throughout the 2016 growing season at an unburned peat plateau and two nearby peat plateaus that bur…

  • Respiration of aged soil carbon during fall in permafrost peatlands enhanced by active layer deepening following wildfire but limited following thermokarst

    Open AccessCristian Estop‐Aragonés, C I Czimczik et al.ARTICLEEnvironmental Research Letters2018

    Permafrost peatlands store globally significant amounts of soil organic carbon (SOC) that may be vulnerable to climate change. Permafrost thaw exposes deeper, older SOC to microbial activity, but SOC vulnerability to mineralization and release as carbon dioxide is likely influenced by the soil environmental conditions that follow thaw. Permafrost thaw in peat plateaus, the dominant type of permafrost peatlands in North America, occurs both throug…

  • Influence of Holocene permafrost aggradation and thaw on the paleoecology and carbon storage of a peatland complex in northwestern Canada

    Open AccessNicolas Pelletier, Julie Talbot et al.ARTICLEThe Holocene2017Cited by: 4References: 4

    Permafrost in peatlands strongly influences ecosystem characteristics, including vegetation composition, hydrological functions, and carbon cycling. Large amounts of organic carbon are stored in permafrost peatlands in northwestern Canada. Their possible degradation into permafrost-free wetlands including thermokarst bogs may affect carbon (C) stocks, but the direction and magnitude of change are uncertain. Using peat core reconstructions, we cha…

  • Biomass offsets little or none of permafrost carbon release from soils, streams, and wildfire

    Open AccessBenjamin W Abbott, Jeremy B Jones et al.ARTICLEEnvironmental Research Letters2016

    As the permafrost region warms, its large organic carbon pool will be increasingly vulnerable to decomposition, combustion, and hydrologic export. Models predict that some portion of this release will be offset by increased production of Arctic and boreal biomass; however, the lack of robust estimates of net carbon balance increases the risk of further overshooting international emissions targets. Precise empirical or model-based assessments of t…

  • Influence of the permafrost boundary on dissolved organic matter characteristics in rivers within the Boreal and Taiga plains of western Canada

    Open AccessDavid Olefeldt, Anders Persson et al.ARTICLEEnvironmental Research Letters2014

    Catchment export of terrestrial dissolved organic matter (DOM) and its downstream degradation in aquatic ecosystems are important components of landscape scale carbon balances. In order to assess the influence of peatland permafrost on river DOM characteristics, we sampled 65 rivers along a 900 km transect crossing into the southern discontinuous permafrost zone on the Boreal and Tundra Plains of western Canada. Catchment peatland cover and catch…