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Forests on drained agricultural peatland are potentially large sources of greenhouse gases – insights from a full rotation period simulation

Journal article
Authors Hongxing He
Per-Erik Jansson
Magnus Svensson
Jesper Björklund
Lasse Tarvainen
Leif Klemedtsson
Åsa Kasimir
Published in Biogeosciences Discussions
Volume 12
Pages 19673-19710
ISSN 1810-6277
Publication year 2015
Published at Department of Earth Sciences
Department of Biological and Environmental Sciences
Pages 19673-19710
Language en
Links dx.doi.org/10.5194/bgd-12-19673-201...
Subject categories Earth and Related Environmental Sciences, Climate Research, Geosciences, Multidisciplinary, Physical Geography, Agricultural Science, Forestry and Fisheries

Abstract

The CoupModel was used to simulate a Norway Spruce forest on fertile drained peat over 60 years, from planting in 1951 until 2011, describing abiotic, biotic and greenhouse gas (GHG) emissions (CO2 and N2O). By calibrating the model against tree ring data we obtained a "reference" model by which we were able to describe the fluxes and controlling factors over the 60 years. We discuss some conceptual issues relevant to improving the model in order to better understand peat soil simulations. However, the present model was able to describe the most important ecosystem dynamics such as the plant biomass development and GHG emissions. The GHG fluxes are composed of two important quantities, the forest carbon (C) uptake, 405 g C m−2 yr−1 and the decomposition of peat soil, 396 g C m−2 yr−1. N2O emissions contribute to the GHG emissions by 0.5 g N m−2 yr−1, corresponding to 56.8 g C m−2 yr−1. The 60-year-old Spruce forest has an accumulated biomass of 164 Mg C ha−1. However, over this period 208 Mg C ha−1 GHG has been added to the atmosphere, which means a net addition of GHG emissions. The main losses are from the peat soil and, indirectly, from forest thinning products, which we assume have a short lifetime. We conclude that after harvest at an age of 80 years, most of the stored biomass carbon is liable to be released, the system having captured C only temporarily and with a cost of disappeared peat, adding CO2 to the atmosphere.

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