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Trace Gas Biogeochemistry (TGB)

TGB-3: Carbon Dioxide and Methane Exchanges Between Wetland and Upland Soils and the Atmosphere, NSA

P.I.(s): Timothy R. Moore, Roger Knowles -- McGill University
Co-I's: John Amaral, Lianne Bellisario, Jill Bubier, Kathleen Savage -- McGill University

Objectives: At sites representing the range of wetlands in the NSA, methane emissions were measured by a static chamber method. Emission rates respond to changes in the thermal and hydraulic regimes of the soils, and will be used to test predictive models based on vegetation, water table or mechanisms. Carbon dioxide and methane fluxes weree measured from upland soils at the major sites, and are being related to microbial and environmental characteristics, as well as vegetation (e.g. post-fire succession). Samples of peat and upland soils were incubated under lab conditions to establish the major controls on microbial production or consumption of these gases. Measurements were made at approximately weekly intervals from late May to September 1994. DOC concentrations in soil water and streams were measured to provide an estimate of DOC flux within the C cycle.

Location: NSA
Sites: NSA-Fen, NSA-OJP, NSA-YJP, NSA-Aspen and other auxiliary sites
Duration: May-September 1994

TGB-3 Pictures

The gas collectors in the collapsed palsa at NSA-Fen

TGB-3 Data Sets

  • Gas Flux CH4
  • Gas Flux CO2
  • Gas Flux CO2 and PAR
  • Soil Profile CH4
  • Soil Profile CO2
  • Soil profile Water table and Peat Temp
  • Substrate DOC

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    TGB-3 BOREAS Operations 1994

    The objective of the study was to measure the flux of carbon dioxide and methane between the atmosphere and upland forest and peatland soils in the NSA, Thompson and to relate these fluxes to environmental variables which will allow spatial extrapolation and modeling of the fluxes.

    Types of Data and Equipment:
    Measurements of CO2 and CH4 were made with small static chambers placed over the soil surface, enclosing the ground layer of vegetation. In the upland soils, these were comprised of dark chambers ca. 30 cm diameter and 40 cm height. In the peatland soils, the dark chambers were supplemented at some sites with clear chambers in which net ecosystem exchange (NEE) was also measured, along with CH4 flux. Measurements were conducted over periods up to 30 min. and calculated as mass of gas fluxed m-2 h-1 or d-1.

    Summary of Places and Times of Measurements:
    Measurements were made at approximately weekly intervals at 11 upland and 15 peatland sites, each with 6 replicate chambers, from early June to mid September, 1994. Upland sites included stands of black spruce (Old Black Spruce trail and Gillam Road), aspen (Old Black Spruce trail and Gillam Road), pine (Young Jack Pine tower), palsa moss and birch (palsa near Fen Tower site) and three regenerating burn sites (aspen and spruce-pine along Gillam Road and spruce near Footprint River). Peatland sites were selected near the Fen Tower to represent the gradients of wet-dry and rich-poor. NEE measurements concentrated on the wet, rich end of this gradient.
    Ancillary measurements included soil temperature and water regimes and available N contents (upland soils) and water table depth and soil thermal regime (peatland soils).
    Laboratory analyses were also conducted of soils to establish the location of CH4 consumption in the upland soil profiles and to identify the controls on this microbial consumption.

    Known Problems or Caveats:
    Caveats on the quality of the data are that only short periods were used for measurement of fluxes, and the constants of the static chamber technique in determining gas fluxes.

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    Last Updated: November 5, 1997