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dc.contributor.authorKirdyanov, Alexander V
dc.contributor.authorSaurer, Matthias
dc.contributor.authorSiegwolf, Rolf
dc.contributor.authorKnorre, Anastasia A
dc.contributor.authorProkushkin, Anatoly S
dc.contributor.authorChurakova (Sidorova), Olga V
dc.contributor.authorFonti, Marina V
dc.contributor.authorBüntgen, Ulf
dc.date.accessioned2020-03-06T07:46:40Z
dc.date.available2020-03-06T07:46:40Z
dc.date.issued2020-03-06
dc.date.submitted2019-12-06
dc.identifier.othererlab7469
dc.identifier.otherab7469
dc.identifier.othererl-108011.r2
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/303100
dc.description.abstractAbstract: Wildfires are an important factor in controlling forest ecosystem dynamics across the circumpolar boreal zone. An improved understanding of their direct and indirect, short- to long-term impacts on vegetation cover and permafrost–vegetation coupling is particularly important to predict changes in carbon, nutrient and water cycles under projected climate warming. Here, we apply dendrochronological techniques on a multi-parameter dataset to reconstruct the effect of wildfires on tree growth and seasonal permafrost thaw depth in Central Siberia. Based on annually-resolved and absolutely dated information from 19 Gmelin larch (Larix gmelinii (Rupr.) Rupr.) trees and active soil layer thickness measurements, we find substantial stand-level die-off, as well as the removal of ground vegetation and the organic layer following a major wildfire in 1896. Reduced stem growth coincides with increased δ13C in the cellulose of the surviving trees during the first decade after the wildfire, when stomatal conductance was reduced. The next six to seven decades are characterized by increased permafrost active soil layer thickness. During this period of post-wildfire ecosystem recovery, enhanced tree growth together with positive δ13C and negative δ18O trends are indicative of higher rates of photosynthesis and improved water supply. Afterwards, a thinner active soil layer leads to reduced growth because tree physiological processes become limited by summer temperature and water availability. Revealing long-term effects of forest fires on active soil layer thickness, ground vegetation composition and tree growth, this study demonstrates the importance of complex vegetation–permafrost interactions that modify the trajectory of post-fire forest recovery across much of the circumpolar boreal zone. To further quantify the influence of boreal wildfires on large-scale carbon cycle dynamics, future work should consider a wide range of tree species from different habitats in the high-northern latitudes.
dc.languageen
dc.publisherIOP Publishing
dc.subjectLetter
dc.subjectactive soil layer
dc.subjectboreal forest
dc.subjectpermafrost
dc.subjectSiberia
dc.subjectstable isotopes
dc.subjecttree rings
dc.subjectwildfire
dc.titleLong-term ecological consequences of forest fires in the continuous permafrost zone of Siberia
dc.typeOther
dc.date.updated2020-03-06T07:46:39Z
prism.issueIdentifier3
prism.publicationNameEnvironmental Research Letters
prism.volume15
dc.identifier.doi10.17863/CAM.50177
dcterms.dateAccepted2020-02-10
rioxxterms.versionofrecord10.1088/1748-9326/ab7469
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/
dc.contributor.orcidChurakova (Sidorova), Olga V [0000-0002-1687-1201]
dc.contributor.orcidFonti, Marina V [0000-0002-2415-8019]
dc.contributor.orcidBüntgen, Ulf [0000-0002-3821-0818]
dc.identifier.eissn1748-9326
pubs.funder-project-idSchweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (SCOPES JRP project IZ73ZO_128035/1)
pubs.funder-project-idRussian Science Foundation (project RSF 18-14-00072)


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