Persistent carbon sink at a boreal drained bog forest
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Published:2018-06-15
Issue:11
Volume:15
Page:3603-3624
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ISSN:1726-4189
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Container-title:Biogeosciences
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language:en
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Short-container-title:Biogeosciences
Author:
Minkkinen Kari, Ojanen PaavoORCID, Penttilä TimoORCID, Aurela MikaORCID, Laurila TuomasORCID, Tuovinen Juha-PekkaORCID, Lohila AnnaleaORCID
Abstract
Abstract. Drainage of peatlands is expected to turn these ecosystems into carbon
sources to the atmosphere. We measured carbon dynamics of a drained forested
peatland in southern Finland over 4 years, including one with severe drought
during growing season. Net ecosystem exchange (NEE) of carbon dioxide
(CO2) was measured with the eddy covariance method from a mast
above the forest. Soil and forest floor CO2 and methane
(CH4) fluxes were measured from the strips and from ditches with
closed chambers. Biomass and litter production were sampled, and soil
subsidence was measured by repeated levellings of the soil surface. The
drained peatland ecosystem was a strong sink of carbon dioxide in all studied
years. Soil CO2 balance was estimated by subtracting the carbon
sink of the growing tree stand from NEE, and it showed that the soil itself
was a carbon sink as well. A drought period in one summer significantly
decreased the sink through decreased gross primary production. Drought also
decreased ecosystem respiration. The site was a small sink for CH4,
even when emissions from ditches were taken into account. Despite the
continuous carbon sink, peat surface subsided slightly during the 10-year
measurement period, which was probably mainly due to compaction of peat. It
is concluded that even 50 years after drainage this peatland site acted as a
soil C sink due to relatively small changes in the water table and in plant
community structure compared to similar undrained sites, and the
significantly increased tree stand growth and litter production. Although the
site is currently a soil C sink, simulation studies with process models are
needed to test whether such sites could remain C sinks when managed for
forestry over several tree-stand rotations.
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics
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