The objectives of this study begun in 2004 are 1) to quantify
the spatial variation of daily and seasonal NEE within the Mer Bleue peatland
and between peatlands of different types and 2) to identify the processes
and the biophysical factors controlling these variations. The main tower
in the Mer Bleue bog is the permanent research site where NEE and water
vapour and energy fluxes are continuously measured using the eddy covariance
technique. Three additional sites have been established within the Mer Bleue
bog but outside of the current flux footprint. These include a cattail marsh,
a poor fen, and an ombrotrophic bog with a different composition of species
from that of the main tower’s flux footprint. All sites are outfitted
with a basic weather station and sensors monitoring microclimate conditions
while a mobile eddy covariance system is moved to one of the three satellite
sites every 1 to 1.5 months. Fluxes of methane and input/outputs of dissolved
organic and inorganic carbon are measured in co-operation with collaborating
researchers. At each site, peatland characteristics required for PCARS simulations
are also collected. This work will contribute to the development of the
PCARS model and its ability to assess the sensitivity of northern peatland
C budgets to climate and land-use change.
Wetlands have been a major focus of research at the Blue Lab. Dr. Peter
Lafleur has been involved in research at a number of wetlands in Canada
(apart from Mer Bleue), including sites at Kesagami River on James Bay,
BOREAS FEN site at Thompson, Manitoba, the Peace-Athabasca Delta in northern
Alberta, and Cape Race on Newfoundland. The focus of most of this research
has been the study of energy and water balances of these wetland ecosystems.
Information from many of these sites was used in the CLASS project for validation
of this land surface process model for wetlands. Here are some links to
other active investigators of the PCARS project:
Prof. Tim Moore, McGill University
Prof. Nigel T. Roulet, McGill University
1) Papers Published
Basiliko, N., R. Knowles and T.R. Moore 2004. On the roles of moss species
and habitat in methane oxidation in
Wetlands 24: 178-185.
Blodau, C., N. Basiliko and T.R. Moore 2004. Carbon turnover in peatland
mesocosms exposed to different water
table levels. Biogeochemistry
Turunen, J., N. Roulet, T.R. Moore and P.J.H. Richard 2004. Nitrogen deposition
and increased carbon accumulation in
ombrotrophic peatlands in eastern Canada. Global Biogeochem.18 # 3, doi
Blodau, C. and T.R. Moore 2003. Microscale CO2 and CH4 dynamics in a peat
soil during a water table fluctuation
and sulfate pulse. Soil
Biology & Biochemistry 35: 535-547.
Blodau, C. and T.R. Moore 2003. Experimental response of peatland carbon
dynamics to a water table fluctuation.
Aquatic Sciences 65:
Bubier, J.L., G. Bhatia, T.R. Moore, N.T. Roulet and P.M. Lafleur, 2003.
Between year and site variability in growing season
net ecosystem CO2 exchange controlled by respiration at a large peatland,
Ontario, Canada. Ecosystems, 6:
Lafleur, P.M., N.T., Roulet, J.L. Bubier, S. Frolking, and T.R. Moore, 2003.
Interannual variability in the peatland-
atmosphere carbon dioxide
exchange at an ombrotrophic bog. Global Biogeochemical Cycles, 17(2), 5.1-5.13,
Blodau, C., C.L. Roehm and T.R. Moore 2002. Iron, sulphur and dissolved
organic carbon dynamics in northern
peatland. Archiv fur
Hydrobiologie 154: 561-583.
Frolking, S., N.T. Roulet, T.R. Moore, P.M. Lafleur, J.L. Bubier and P.M.
Crill 2002. Modeling the seasonal to annual carbon
balance of Mer Bleue Bog, Ontario, Canada. Global Biogeochemical Cycles
2) Papers Accepted and In Press
Lafleur, PM, R.A. Hember, S.W. Admiral, and N.T. Roulet. Annual and Seasonal
Variability in Evapotranspiration and Water
Table at a Shrub-covered Bog in southern Ontario, Canada. Hydrological Processes,
accepted August 2004.
Lafleur, P.M., T.R. Moore, N.T. Roulet, and S. Frolking. Ecosystem respiration
in a cool temperate bog depends upon peat
temperature but not water table. Ecosystems, in press.
Moore, T.R., C. Blodau, J. Turunen, N.T. Roulet & P.J.H. Richard in
press. Recent rates of N and S accumulation in peatlands,
eastern Canada. Global Change Biology.
3) Papers Submitted or In Preparation
Hember, R.A., P.M. Lafleur and J.G. Cogley. Synoptic Controls on Summer
Evapotranspiration from a Bog Peatland in
southern Canada. Submitted to International J. Climatology, August 2004.
Letts, M, P.M. Lafleur, and N.T. Roulet. On the relationship between cloudiness
and net ecosystem exchange in a
Submitted to Ecoscience July 2004.
Richard, P.J.H., A.C. Larouche and N. Morasse. Vegetation history and local
conditions of peat accumulation in two cores
from the Mer Bleue Peatland, Ontario (provisional title). In preparation
for Canadian Journal of Botany.
Richard, P.J.H., A.C. Larouche and N. Morasse. Regional vegetation history
around the Mer Bleue Peatland, Ontario (provisional
title). In preparation for Canadian Journal of Earth Sciences.
4) Theses Completed
Fraser, C. 2000. The hydrology and dissolved organic carbon (DOC) biogeochemistry
of a boreal peatland. M.Sc.
Thesis, McGill University.
Blodau, C. 2002. Carbon biogeochemistry in northern peatlands: regulation
by environmental and biogeochemical
factors. Ph.D. Thesis,
Isernhagen, B., 2002. The effect of beaver pond drainage on CO2 and CH4
fluxes in a Canadian temperate peatland. M.Sc.
Thesis, McGill University.
Reimer, A. 2002. The role of bog plants in the exchange of carbon dioxide
and water between the atmosphere and the Mer
Bleue peatland. M.Sc. Thesis, McGill University.
Roehm, C. 2003. Carbon dynamics in northern peatlands, Canada. Ph.D. Thesis,
Smith, C.R. Winter Carbon Dioxide Exchange at an Ombrotrophic Bog in Southern
Ontario, M.Sc. thesis, October 10, 2003,
Watershed Ecosystems Graduate Program, Trent University, Peterborough, Ontario.
5) Oral Presentations
Smith, R. and P.M. Lafleur, Wintertime net ecosystem exchange of CO2 from
the Mer Bleue bog peatland [poster], 60th
Eastern Snow Conference, Sherbrooke, Quebec, June 4-6, 2003.
Lafleur, P.M., Carbon exchange from Canadian Peatlands – Perspective
and Understanding (invited), Canadian
Meteorological and Oceanographic
Society, 37th Congress, June 2-5, Ottawa, 2003.
Roulet, N.T., Frolking, S., Lafleur, P.M., Moore, T.R., Richard, P.H.J,
Measurement and modelling of the sources and sinks
of greenhouse gases from northern wetlands (solicited), EGS-AAG Joint Assembly,
Nice France, 06-11 April, 2003.
Lafleur, P.M., T.R. Moore, N.T. Roulet and S. Frolking, Controls on Ecosystem
Respiration in an Ombrotrophic Bog [Poster]
29th Annual Meeting of the Canadian Geophysical Union, Banff, Alberta, 11-15
Moore, T.R., P.M. Lafleur, N.T. Roulet and S. Frolking, Dependency of Ecosystem
Respiration in a Cool Temperate Bog
on Peat Temperature and Water Table. AGU Annual Meeting, San Francisco,
CA, 8-12 December, 2003.
Rattle, J. et al., poster on N transformations at Mer Bleue, at AGU/CGU
Joint Meeting, Montreal May 2004 and
INTECOL Wetlands Meeting,
Utrecht, July 2004.
Stewart, H. et al., poster on Partitioning carbon dioxide into root- and
plant-derived sources in a bog at AGU/CGU
Joint Meeting, Montreal
May 2004 and INTECOL Wetlands Meeting, Utrecht, July 2004.
Stewart, H and N. Basiliko, oral presentation on The priming effect of roots
on peat decomposition in a bog Annual
Meeting of Canadian
Society of Soil Science, Montreal, August, 2003.
Moore, T.R., on Nitrogen at Mer Bleue (poster) and Nitrogen and sulfur accumulation
rates in eastern Canadian
ombrotrophic bogs (oral)
at INTECOL Wetlands Meeting, Utrecht, July 2004.
Cubasch, U and 40 others, 2001. Projections of future climate change. In:
Climate Change 2001: The Scientific Basis. Contribution
of Working Group I to the Third Assessment Report of the Intergovernmental
Panel on Climate Change. Cambridge
University Press, Cambridge, New York.
Frolking, S. et al., 2002. Modelling the seasonal to annual carbon balance
of Mer Bleue Bog, Ontario, Canada. Global Biogeochemical
Cycles, 16: 1029-1040.
Frolking, S. et al., 1998. Relationship between ecosystem productivity and
photosynthetically active radiation for
Global Biogeochemical Cycles, 12: 115-126.
Gorham, E., 1991. Northern peatlands: role in the carbon balance and probable
responses to climatic warming.
Lafleur, P.M., Roulet, N.T., and Admiral, S., 2001. The annual cycle of
CO2 exchange at a boreal bog peatland. J.
Turunen, J.E., T.K. Tolonen and A. Reinikainen, 2002. Estimating carbon
accumulation rates of undrained mires in
applications to boreal and subarctic regions. Holocene 12, 69-80.