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Carbon and water balance of an afforested shallow drained peatland in Iceland

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dc.contributor University of Akureyri
dc.contributor.author Bjarnadóttir, Brynhildur
dc.contributor.author Aslan Sungur, Guler
dc.contributor.author Sigurðsson, Bjarni Diðrik
dc.contributor.author Kjartansson, Bjarki T.
dc.contributor.author Óskarsson, Hlynur
dc.contributor.author Oddsdottir, Edda S.
dc.contributor.author Gunnarsdottir, Gunnhildur E.
dc.contributor.author Black, Andrew
dc.date.accessioned 2022-03-26T01:01:29Z
dc.date.available 2022-03-26T01:01:29Z
dc.date.issued 2021-02-15
dc.identifier.citation Bjarnadóttir , B , Aslan Sungur , G , Sigurðsson , B D , Kjartansson , B T , Óskarsson , H , Oddsdottir , E S , Gunnarsdottir , G E & Black , A 2021 , ' Carbon and water balance of an afforested shallow drained peatland in Iceland ' , Forest Ecology and Management , vol. 482 , 118861 . https://doi.org/10.1016/j.foreco.2020.118861
dc.identifier.issn 0378-1127
dc.identifier.other PURE: 28480252
dc.identifier.other PURE UUID: 1b155cd3-8ba0-4aa8-a18d-e99b0275518c
dc.identifier.other Scopus: 85098078070
dc.identifier.other unpaywall: 10.1016/j.foreco.2020.118861
dc.identifier.other WOS: 000617965600004
dc.identifier.uri https://hdl.handle.net/20.500.11815/2978
dc.description Funding Information: This research was supported by the Energy Research fund of Landsvirkjun, the National Power Company of Iceland, with an additional support from the Iceland State Electricity. It also contributes to the Nordic CAR-ES project ( C entre of A dvanced R esearch on E nvironmental S ervices from Nordic Forest Ecosystems) and to the SNS 120 program (Nordic Forest Research on Anthropogenic greenhouse gas emissions from organic forest soils: improved inventories and implications for sustainable management). Publisher Copyright: © 2020 The Author(s)
dc.description.abstract Drainage of peatlands increases the depth of the oxic peat layer and can turn them into a carbon (C) source to the atmosphere. Afforestation of drained peatlands could help to reverse this process since the trees may enhance C sequestration. We followed the C and water dynamics of an afforested drained peatland in S-Iceland during a 2 year period, during which the Black Cottonwood (Populus balsamifera ssp. trichocarpa) plantation was 23–25 year old. Net ecosystem exchange (NEE) of carbon dioxide (CO2) was measured with the eddy covariance method and C pools of trees and ground vegetation were measured using the stock change method. Lateral losses of dissolved and particulated organic C (DOC, POC) were estimated from weekly water-runoff samples. Unexpectedly, the afforested drained peatland was a strong sink of carbon during the two years, with an average NEE value of 714 g C m−2 yr−1. Only 0.5% of the total NEE was lost through lateral DOC and POC transport, leaving 710 g C m−2 yr−1 as the total net ecosystem production (NEP). Ca. 91% of the observed NEP could be explained by the annual biomass increment of the Black Cottonwood trees and 1.3% by the ground vegetation. This means that the remaining 7.5% of the total NEP most likely accumulated in peat soil and litter, contributing to the soil C stocks. The dormant-season CO2 emissions were unexpectedly low, which was explained by a high groundwater level at this drained site outside the ca. 5 months of the active growing season. On average, 66% of the annual measured precipitation was estimated to have evaporated back to the atmosphere. This left 416 mm for potential runoff, which was somewhat lower value than the measured runoff (662 mm). These results indicate that during the age span of ca. 20–25 years, afforestation was a valid method to reverse the expected negative C-balance of this drained grassland pasture in Iceland. 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.
dc.description.abstract Drainage of peatlands increases the depth of the oxic peat layer and can turn them into a carbon (C) source to the atmosphere. Afforestation of drained peatlands could help to reverse this process since the trees may enhance C sequestration. We followed the C and water dynamics of an afforested drained peatland in S-Iceland during a 2 year period, during which the Black Cottonwood (Populus balsamifera ssp. trichocarpa) plantation was 23–25 year old. Net ecosystem exchange (NEE) of carbon dioxide (CO2) was measured with the eddy covariance method and C pools of trees and ground vegetation were measured using the stock change method. Lateral losses of dissolved and particulated organic C (DOC, POC) were estimated from weekly water-runoff samples. Unexpectedly, the afforested drained peatland was a strong sink of carbon during the two years, with an average NEE value of 714 g C m−2 yr−1. Only 0.5% of the total NEE was lost through lateral DOC and POC transport, leaving 710 g C m−2 yr−1 as the total net ecosystem production (NEP). Ca. 91% of the observed NEP could be explained by the annual biomass increment of the Black Cottonwood trees and 1.3% by the ground vegetation. This means that the remaining 7.5% of the total NEP most likely accumulated in peat soil and litter, contributing to the soil C stocks. The dormant-season CO2 emissions were unexpectedly low, which was explained by a high groundwater level at this drained site outside the ca. 5 months of the active growing season. On average, 66% of the annual measured precipitation was estimated to have evaporated back to the atmosphere. This left 416 mm for potential runoff, which was somewhat lower value than the measured runoff (662 mm). These results indicate that during the age span of ca. 20–25 years, afforestation was a valid method to reverse the expected negative C-balance of this drained grassland pasture in Iceland. 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.
dc.format.extent
dc.language.iso en
dc.relation.ispartofseries Forest Ecology and Management; 482()
dc.rights info:eu-repo/semantics/openAccess
dc.subject Kolefni
dc.subject Votlendi
dc.subject Vatn
dc.subject Carbon cycle
dc.subject Drained wetland
dc.subject Land-use change
dc.subject Mitigation
dc.subject Populus trichocarpa
dc.subject Carbon cycle
dc.subject Land-use changes
dc.subject Mitigation
dc.subject Drained wetland
dc.subject Forestry
dc.subject Nature and Landscape Conservation
dc.subject Management, Monitoring, Policy and Law
dc.title Carbon and water balance of an afforested shallow drained peatland in Iceland
dc.type /dk/atira/pure/researchoutput/researchoutputtypes/contributiontojournal/article
dc.description.version Peer reviewed
dc.identifier.doi https://doi.org/10.1016/j.foreco.2020.118861
dc.relation.url http://www.scopus.com/inward/record.url?scp=85098078070&partnerID=8YFLogxK
dc.contributor.department Nature & Forest


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