Landscape Scale Investigation of
Greenhouse Gas Exchange (LAGGE)
Leif Klemedtsson, Department of Earth Sciences
Gothenburg University Contact: [email protected]
To quantify GHG balances, and matter transport at the
landscape scale in forested regions that include land-
atmosphere, land-water, and water-atmosphere exchange
of CO2, CH4 and N2O as well as DOC/DON.
To incorporate new measurements and technologies as
well as available data from ongoing environmental monitoring
to estimate the overall watershed net C and GHG balances
at different scales, by linking data with models.
The aims of this project are:
Large team within LAGGE and at
Skogaryd
L. Klemedtsson1, D, Allbrand1, D. Bastviken2, R.G. Björk1, A.-K.
Björsne1, P. Boeckx3, P. Crill4, A. Ekblad5, M. Ernfors1, H. He1, M.
Hellstöm6, J. Holst6 P-E. Jansson7, E. Julén1, C. Kalin6, A. Lindroth6, A.
Meyer1, S. Natchimuthu2, A. Nousratpour1, J. Nylinder1, E.
Podgrajsek8, A. Rutgersson8, T. Rütting1, M. Räntfors1, E. Sahlée9,
L.Shubhangi1, S. Sobek9, L. Tarvainen1, L. Tranvik8, J. Uddling1, G.
Wallin1, P. Weslien1, and G. Weyhenmeyer8 and more!
1University of Gothenburg, Sweden, 2Linköping University, Sweden, 3Ghent University,
Belgium, 4Stockholm University, Sweden, 5Örebro University, Sweden, 6Royal Institute of
Technology, Sweden, 7Lund University, Sweden, 8Uppsala University, Sweden.
Terrestrial ecosystems
are sinks for C
The global land sink is estimated to be 2.6 T 1.7 Pg
of C year−1 (variability T range, excluding C emissions
because of deforestation) (K. L. Denman et al., 2007)
The problem…
From Benoy et al. 2007
CO2 equivalents
Aquatic CH4
return 25 % of the
land CO2 eq.
sink!?
(CO2+CH4 = 79%) Bastviken et al. 2011
Tranvik et al. 2009
Lake organic matter is related to the soil
organic matter in the catchments
Weyhenmeyer et al., 2012 (GCB)
Skogaryd Research station (58°23’N, 12°09’E).
Ecosystems
“Catchment”
Lake Erssjön
Team Rutgersson et al. and Team Bastviken et al.
Mire systems
Mire Micrometeorological
station
Team Crill et al.,/Lindroth et al.
and UGOT
Mire systems
Mire stream station
NEE versus TOC
Degrö mire
• Of the annual net CO2-C uptake, 37% and 31% was lost
through runoff (with runoff TOC>DIC >> CH4).
• ….. the variability in runoff export of Total Organic
Carbon (TOC) from boreal continental mires originates
from variations in the annual specific discharge,
rather than TOC concentration.
Nilsson et al., 2008 (Global Change Biology)
Forest ecosystems
The global land sink is estimated to be 2.6 T 1.7 Pg
of C year−1 (variability T range, excluding C emissions
because of deforestation) (K. L. Denman et al., 2007)
But, is this true for all forest ecosystems?
No real net uptake of
CO2 in relation to
biomass production
on drained organic
soils
2.7 (±1.0)
+13.1 (±2.2)
-2.0 (±0.3a) -0.01 (±2.6b)
Decay of roots and mycelia
+8.2 (±1.9b)
Decay of plant litter
-8.2 (±1.7)
NEEmeas NEEcalc
Approach 1 Approach 2
+6.2
-
Measured soil efflux RSOM
Residual soil efflux Rres
2.2(±0.4)
a assuming 15% data uncertaintyb propagated error estimates are calculated by the Gaussian error propagation scheme
assuming that components are independent
CO2
(?)
N2O equal to about 1 ton C
Conclusion so far…
• The drained afforested organic soils, former under
agricultural use, are most likely a net source for GHG, -
the DOC contribution is still unknown.
• They represent abort 1/3 of drained forests. Ernfors et al.
(2008)
• Ernfors et al. (2008) estimated that afforested organic
soils contribute by 18% to the total Swedish
anthropogenic N2O emissions.
• The mineral sites are under investigation!
Question
• What are the implications for the
management of land, forests and water in
a changing climate?
Thank You
