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Short- and long-ter...
Short- and long-term plant and microbial uptake of 15N-labelled urea in a mesic tundra heath, West Greenland
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- Barthelemy, Hélène (author)
- Department of Biological Science, University of Bergen, Bergen, Norway
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- Nobel, Liv Alexa (author)
- Department of Biology, Terrestrial Ecology, University of Copenhagen, Copenhagen, Denmark; Center for Permafrost (CENPERM), University of Copenhagen, Copenhagen, Denmark
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- Stark, Sari (author)
- Arctic Centre, University of Lapland, Rovaniemi, Finland
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- Väisänen, Maria (author)
- Arctic Centre, University of Lapland, Rovaniemi, Finland; Ecology and Genetics Research Unit, University of Oulu, Oulu, Finland
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- Olofsson, Johan (author)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap
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- Michelsen, Anders (author)
- Department of Biology, Terrestrial Ecology, University of Copenhagen, Copenhagen, Denmark; Center for Permafrost (CENPERM), University of Copenhagen, Copenhagen, Denmark
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(creator_code:org_t)
- Springer Nature, 2024
- 2024
- English.
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In: Polar Biology. - : Springer Nature. - 0722-4060 .- 1432-2056. ; 47:1, s. 1-15
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https://doi.org/10.1...
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https://umu.diva-por... (primary) (Raw object)
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Abstract
Subject headings
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- Terrestrial animals are key elements in the cycling of elements in the Arctic where nutrient availability is low. Waste production by herbivores, in particular urine deposition, has a crucial role for nitrogen (N) recycling, still, it remains largely unexplored. Also, experimental evidence is biased toward short-term studies and Arctic regions under high herbivore pressure. In this study, we aimed to examine the fate of N derived from urine in a nutrient poor tundra heath in West Greenland, with historical low level of herbivory. We performed a pulse labelling with 15N-urea over the plant canopy and explored ecosystem N partition and retention in the short-term (2 weeks and 1 year) and longer-term (5 years). We found that all vascular plants, irrespective of their traits, could rapidly take up N-urea, but mosses and lichens were even more efficient. Total 15N enrichment was severely reduced for all plants 5 years after tracer addition, with the exception of cryptogams, indicating that non-vascular plants constituted a long-term sink of 15N-urea. The 15N recovery was also high in the litter suggesting high N immobilization in this layer, potentially delaying the nutrients from urine entering the soil compartment. Long-term 15N recovery in soil microbial biomass was minimal, but as much as 30% of added 15N remained in the non-microbial fraction after 5 years. Our results demonstrate that tundra plants that have evolved under low herbivory pressure are well adapted to quickly take advantage of labile urea, with urine having only a transient effect on soil nutrient availability.
Subject headings
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
Keyword
- 15N labelling
- Arctic tundra
- Ecosystem N retention
- Microbial N immobilization
- Plant nitrogen uptake
- Urine
Publication and Content Type
- ref (subject category)
- art (subject category)
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