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Experimentally incr...
Experimentally increased nutrient availability at the permafrost thaw front selectively enhances biomass production of deep-rooting subarctic peatland species
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- Keuper, Frida (författare)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,Systems Ecology, Department of Ecological Science, VU University Amsterdam, Amsterdam, The Netherlands ; UR1158 AgroImpact, INRA, Barenton-Bugny, France
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- Dorrepaal, Ellen (författare)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,Systems Ecology, Department of Ecological Science, VU University Amsterdam, Amsterdam, The Netherlands,Arcum
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van Bodegom, Peter M. (författare)
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van Logtestijn, Richard (författare)
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Venhuizen, Gemma (författare)
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van Hal, Jurgen (författare)
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Aerts, Rien (författare)
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(creator_code:org_t)
- 2017-07-25
- 2017
- Engelska.
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Ingår i: Global Change Biology. - : WILEY. - 1354-1013 .- 1365-2486. ; 23:10, s. 4257-4266
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Climate warming increases nitrogen (N) mineralization in superficial soil layers (the dominant rooting zone) of subarctic peatlands. Thawing and subsequent mineralization of permafrost increases plant-available N around the thaw-front. Because plant production in these peatlands is N-limited, such changes may substantially affect net primary production and species composition. We aimed to identify the potential impact of increased N-availability due to permafrost thawing on subarctic peatland plant production and species performance, relative to the impact of increased N-availability in superficial organic layers. Therefore, we investigated whether plant roots are present at the thaw-front (45 cm depth) and whether N-uptake (N-15-tracer) at the thaw-front occurs during maximum thaw-depth, coinciding with the end of the growing season. Moreover, we performed a unique 3-year belowground fertilization experiment with fully factorial combinations of deep-(thaw-front) and shallow-fertilization (10 cm depth) and controls. We found that certain species are present with roots at the thaw-front (Rubus chamaemorus) and have the capacity (R. chamaemorus, Eriophorum vaginatum) for N-uptake from the thaw-front between autumn and spring when aboveground tissue is largely senescent. In response to 3-year shallow-belowground fertilization (S) both shallow-(Empetrum hermaphroditum) and deep-rooting species increased aboveground biomass and N-content, but only deep-rooting species responded positively to enhanced nutrient supply at the thaw-front (D). Moreover, the effects of shallow-fertilization and thaw-front fertilization on aboveground biomass production of the deep-rooting species were similar in magnitude (S: 71%; D: 111% increase compared to control) and additive (S + D: 181% increase). Our results show that plant-available N released from thawing permafrost can form a thus far overlooked additional N-source for deep-rooting subarctic plant species and increase their biomass production beyond the already established impact of warming-driven enhanced shallow N-mineralization. This may result in shifts in plant community composition and may partially counteract the increased carbon losses from thawing permafrost.
Ämnesord
- NATURVETENSKAP -- Biologi -- Botanik (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Botany (hsv//eng)
Nyckelord
- belowground nitrogen
- climate change
- Empetrum hermaphroditum
- fertilization
- frozen soil
- perrmafrost thaw
- root uptake
- Rubus chamaemorus
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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