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Multi-year data-mod...
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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 ...
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2020-08-17
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IOP Publishing,2020
Nummerbeteckningar
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LIBRIS-ID:oai:lup.lub.lu.se:03aa1242-a44f-4c2b-bd3f-092d4d5186fd
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https://lup.lub.lu.se/record/03aa1242-a44f-4c2b-bd3f-092d4d5186fdURI
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https://doi.org/10.1088/1748-9326/ab865bDOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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Anmärkningar
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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 ...)
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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)
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Mastepanov, MikhailUniversity of Oulu,Aarhus University(Swepub:lu)ple-mma
(författare)
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Skov, KirstineUniversity of Copenhagen,Aarhus University
(författare)
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Westergaard-Nielsen, AndreasUniversity of Copenhagen
(författare)
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Williams, MathewUniversity of Edinburgh
(författare)
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Christensen, Torben R.Aarhus University(Swepub:lu)ekol-tch
(författare)
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Aarhus UniversityInstitutionen för naturgeografi och ekosystemvetenskap
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Environmental Research Letters: IOP Publishing15:91748-93181748-9326
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