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Sökning: onr:"swepub:oai:lup.lub.lu.se:03aa1242-a44f-4c2b-bd3f-092d4d5186fd" > Multi-year data-mod...

  • López-Blanco, EfrénAarhus University (författare)

Multi-year data-model evaluation reveals the importance of nutrient availability over climate in arctic ecosystem C dynamics

  • Artikel/kapitelEngelska2020

Förlag, utgivningsår, omfång ...

  • 2020-08-17
  • IOP Publishing,2020

Nummerbeteckningar

  • LIBRIS-ID:oai:lup.lub.lu.se:03aa1242-a44f-4c2b-bd3f-092d4d5186fd
  • https://lup.lub.lu.se/record/03aa1242-a44f-4c2b-bd3f-092d4d5186fdURI
  • https://doi.org/10.1088/1748-9326/ab865bDOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:art swepub-publicationtype
  • Ämneskategori:ref swepub-contenttype

Anmärkningar

  • Arctic tundra is a globally important store for carbon (C). However, there is a lack of reference sites characterising C exchange dynamics across annual cycles. Based on the Greenland Ecosystem Monitoring (GEM) programme, here we present 9-11 years of flux and ecosystem data across the period 2008-2018 from two wetland sites in Greenland: Zackenberg (74°N) and Kobbefjord (64°N). The Zackenberg fen was a strong C sink despite its higher latitude and shorter growing seasons compared to the Kobbefjord fen. On average the ecosystem in Zackenberg took up ∼-50 g C m-2 yr-1 (range of +21 to-90 g C m-2 yr-1), more than twice that of Kobbefjord (mean ∼-18 g C m-2 yr-1, and range of +41 to-41 g C m-2 yr-1). The larger net carbon sequestration in Zackenberg fen was associated with higher leaf nitrogen (71%), leaf area index (140%), and plant quality (i.e. C:N ratio; 36%). Additional evidence from in-situ measurements includes 3 times higher levels of dissolved organic carbon in soils and 5 times more available plant nutrients, including dissolved organic nitrogen (N) and nitrates, in Zackenberg. Simulations using the soil-plant-atmosphere ecosystem model showed that Zackenberg's stronger CO2 sink could be related to measured differences in plant nutrients, and their effects on photosynthesis and respiration. The model explained 69% of the variability of net ecosystem exchange of CO2, 80% for photosynthesis and 71% for respiration over 11 years at Zackenberg, similar to previous results at Kobbefjord (73%, 73%, and 50%, respectively, over 8 years). We conclude that growing season limitations of plant phenology on net C uptake have been more than counterbalanced by the increased leaf nutrient content at the Zackenberg site.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Jackowicz-Korczynski, MarcinLund University,Lunds universitet,Institutionen för naturgeografi och ekosystemvetenskap,Naturvetenskapliga fakulteten,Dept of Physical Geography and Ecosystem Science,Faculty of Science,Aarhus University(Swepub:lu)nate-mjs (författare)
  • Mastepanov, MikhailUniversity of Oulu,Aarhus University(Swepub:lu)ple-mma (författare)
  • Skov, KirstineUniversity of Copenhagen,Aarhus University (författare)
  • Westergaard-Nielsen, AndreasUniversity of Copenhagen (författare)
  • Williams, MathewUniversity of Edinburgh (författare)
  • Christensen, Torben R.Aarhus University(Swepub:lu)ekol-tch (författare)
  • Aarhus UniversityInstitutionen för naturgeografi och ekosystemvetenskap (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Environmental Research Letters: IOP Publishing15:91748-93181748-9326

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