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

Artikel i vetenskaplig tidskrift
Författare Hongxing He
Per-Erik Jansson
Magnus Svensson
Jesper Björklund
Lasse Tarvainen
Leif Klemedtsson
Åsa Kasimir
Publicerad i Biogeosciences
Volym 13
Sidor 2305–2318
ISSN 1726-4170
Publiceringsår 2016
Publicerad vid Institutionen för geovetenskaper
Institutionen för biologi och miljövetenskap
Sidor 2305–2318
Språk en
Länkar dx.doi.org/10.5194/bg-13-2305-2016
Ämnesord CoupModel, drained peat soil, CO2, N2O, forestry.
Ämneskategorier Geovetenskap och miljövetenskap, Ekologi, Skogsvetenskap, Markvetenskap

Sammanfattning

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 a “vegetation fitted” model was obtained 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 spruce forest carbon (C) uptake, 413 g C m-2 yr-1 and the decomposition of peat soil, 399 gCm-2 yr-1. N2O emissions contribute to the GHG emissions by up to 0.7 gNm-2 yr-1, corresponding to 76 g Cm-2 yr-1. The 60-year old spruce forest has an accumulated biomass of 16.0 kg Cm-2 (corresponding to 60 kgCO2 m-2). However, over this period, 26.4 kg m-2 (97 kgCO2eqm-2) has been added to the atmosphere, as both CO2 and N2O originating 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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