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dc.contributor.authorSpeed, James David Mervyn
dc.contributor.authorMartinsen, Vegard
dc.contributor.authorHester, Alison J.
dc.contributor.authorHoland, Øystein
dc.contributor.authorMulder, Jan
dc.contributor.authorMysterud, Atle
dc.contributor.authorAustrheim, Gunnar
dc.date.accessioned2015-07-27T08:19:48Z
dc.date.accessioned2015-09-02T10:57:44Z
dc.date.available2015-07-27T08:19:48Z
dc.date.available2015-09-02T10:57:44Z
dc.date.issued2015
dc.identifier.citationBiogeosciences 2015, 12(5):1615-1627nb_NO
dc.identifier.issn1726-4170
dc.identifier.urihttp://hdl.handle.net/11250/298457
dc.description.abstractTreelines differentiate vastly contrasting ecosystems: open tundra from closed forest. Treeline advance has implications for the climate system due to the impact of the transition from tundra to forest ecosystem on carbon (C) storage and albedo. Treeline advance has been seen to increase above-ground C stocks as low vegetation is replaced with trees but decrease organic soil C stocks as old carbon is decomposed. However, studies comparing across the treeline typically do not account for elevational variation within the ecotone. Here we sample ecosystem C stocks along an elevational gradient (970 to 1300 m), incorporating a large-scale and long-term livestock grazing experiment, in the southern Norwegian mountains. We investigate whether there are continuous or discontinuous changes in C storage across the treeline ecotone, and whether these are modulated by grazing. We find that vegetation C stock decreases with elevation, with a clear breakpoint between the forest line and treeline above which the vegetation C stock is constant. C stocks in organic surface horizons of the soil were higher above the treeline than in the forest, whereas C stocks in mineral soil horizons are unrelated to elevation. Total ecosystem C stocks also showed a discontinuous elevational pattern, increasing with elevation above the treeline (8 gm-2 per metre increase in elevation), but decreasing with elevation below the forest line (-15 gm-2 per metre increase in elevation), such that ecosystem C storage reaches a minimum between the forest line and treeline. We did not find any effect of short-term (12 years) grazing on the elevational patterns. Our findings demonstrate that patterns of C storage across the treeline are complex, and should be taken account of when estimating ecosystem C storage with shifting treelines.nb_NO
dc.language.isoengnb_NO
dc.publisherEuropean Geosciences Unionnb_NO
dc.titleContinuous and discontinuous variation in ecosystem carbon stocks with elevation across a treeline ecotonenb_NO
dc.typeJournal articlenb_NO
dc.typePeer revieweden_GB
dc.date.updated2015-07-27T08:19:48Z
dc.source.pagenumber1615-1627nb_NO
dc.source.volume12nb_NO
dc.source.journalBiogeosciencesnb_NO
dc.source.issue5nb_NO
dc.identifier.doi10.5194/bg-12-1615-2015
dc.identifier.cristin1202529
dc.relation.projectNorges forskningsråd: 179569nb_NO
dc.description.localcode© Author(s) 2015. This work is distributed under the Creative Commons Attribution 3.0 License.nb_NO


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