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dc.contributor.authorSandén, Hans
dc.contributor.authorMayer, Mathias
dc.contributor.authorStark, Sari
dc.contributor.authorSandén, Taru
dc.contributor.authorNilsson, Lars Ola
dc.contributor.authorJepsen, Jane Uhd
dc.contributor.authorWäli, Oiippa Ritta
dc.contributor.authorRewald, Boris
dc.description.abstractTree mortality from insect infestations can significantly reduce carbon storage in forest soils. In subarctic birch forests (Betula pubescens), ecosystem C cycling is largely affected by recurrent outbreaks of defoliating geometrid moths (Epirrita autumnata, Operophtera brumata). Here, we show that soil C stocks in birch forests across Fennoscandia did not change up to 8 years after moth outbreaks. We found that a decrease in woody fine roots was accompanied by a lower soil CO2 efflux rate and a higher soil N availability following moth outbreaks. We suggest that a high N availability and less ectomycorrhiza likely contributed to lowered heterotrophic respiration and soil enzymatic activity. Based on proxies for decomposition (heterotrophic respiration, phenol oxidase potential activity), we conclude that a decrease in decomposition is a prime cause why soil C stocks of mountain birch forest ecosystems have not changed after moth outbreaks. Compared to disturbed temperate and boreal forests, a CO2-related positive feedback of forest disturbance on climate change might therefore be smaller in subarctic regions.nb_NO
dc.rightsNavngivelse 4.0 Internasjonal*
dc.subjectBetula pubescensnb_NO
dc.subjectdisturbed subarctic forestsnb_NO
dc.subjectEpirrita autumnatanb_NO
dc.subjectheterotrophic soil respirationnb_NO
dc.subjectOperophtera brumatanb_NO
dc.subjectroot biomassnb_NO
dc.subjectsoil carbon sequestrationnb_NO
dc.subjectsoil CO2 effluxnb_NO
dc.subjectsoil enzyme activitynb_NO
dc.subjectstructural equation modellingnb_NO
dc.titleMoth Outbreaks Reduce Decomposition in Subarctic Forest Soilsnb_NO
dc.typePeer reviewednb_NO
dc.typeJournal article
dc.rights.holder© 2019 The Author(s)nb_NO
dc.subject.nsiVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480nb_NO
dc.relation.projectNorges Forskningsråd: 24454nb_NO

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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal