Slow recovery of High Arctic heath communities from nitrogen enrichment

Lorna E. Street, Nancy R. Burns, Sarah J. Woodin

Research output: Contribution to journalArticle

14 Citations (Scopus)
6 Downloads (Pure)

Abstract

Summary

•Arctic ecosystems are strongly nutrient limited and exhibit dramatic responses to nitrogen (N) enrichment, the reversibility of which is unknown. This study uniquely assesses the potential for tundra heath to recover from N deposition and the influence of phosphorus (P) availability on recovery.
•We revisited an experiment in Svalbard, established in 1991, in which N was applied at rates representing atmospheric N deposition in Europe (10 and 50 kg N ha−1 yr−1; ‘low’ and ‘high’, respectively) for 3–8 yr. We investigated whether significant effects on vegetation composition and ecosystem nutrient status persisted up to 18 yr post-treatment.
•Although the tundra heath is no longer N saturated, N treatment effects persist and are strongly P-dependent. Vegetation was more resilient to N where no P was added, although shrub cover is still reduced in low-N plots. Where P was also added (5 kg P ha−1 yr−1), there are still effects of low N on community composition and nutrient dynamics. High N, with and without P, has many lasting impacts. Importantly, N + P has caused dramatically increased moss abundance, which influences nutrient dynamics.
•Our key finding is that Arctic ecosystems are slow to recover from even small N inputs, particularly where P is not limiting.
Original languageEnglish
Pages (from-to)682-695
Number of pages14
JournalNew Phytologist
Volume206
Issue number2
Early online date19 Jan 2015
DOIs
Publication statusPublished - Apr 2015

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Arctic region
Nitrogen
Ecosystem
Food
tundra
nutrients
nitrogen
ecosystems
Svalbard
Bryophyta
vegetation
Phosphorus
mosses and liverworts
shrubs
phosphorus
Tundra

Keywords

  • bryophytes
  • critical load
  • nitrogen (N) deposition
  • phosphorus (P)
  • recovery
  • tundra
  • winter injury

Cite this

Slow recovery of High Arctic heath communities from nitrogen enrichment. / Street, Lorna E.; Burns, Nancy R.; Woodin, Sarah J.

In: New Phytologist, Vol. 206, No. 2, 04.2015, p. 682-695.

Research output: Contribution to journalArticle

Street, Lorna E. ; Burns, Nancy R. ; Woodin, Sarah J. / Slow recovery of High Arctic heath communities from nitrogen enrichment. In: New Phytologist. 2015 ; Vol. 206, No. 2. pp. 682-695.
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abstract = "Summary•Arctic ecosystems are strongly nutrient limited and exhibit dramatic responses to nitrogen (N) enrichment, the reversibility of which is unknown. This study uniquely assesses the potential for tundra heath to recover from N deposition and the influence of phosphorus (P) availability on recovery.•We revisited an experiment in Svalbard, established in 1991, in which N was applied at rates representing atmospheric N deposition in Europe (10 and 50 kg N ha−1 yr−1; ‘low’ and ‘high’, respectively) for 3–8 yr. We investigated whether significant effects on vegetation composition and ecosystem nutrient status persisted up to 18 yr post-treatment.•Although the tundra heath is no longer N saturated, N treatment effects persist and are strongly P-dependent. Vegetation was more resilient to N where no P was added, although shrub cover is still reduced in low-N plots. Where P was also added (5 kg P ha−1 yr−1), there are still effects of low N on community composition and nutrient dynamics. High N, with and without P, has many lasting impacts. Importantly, N + P has caused dramatically increased moss abundance, which influences nutrient dynamics.•Our key finding is that Arctic ecosystems are slow to recover from even small N inputs, particularly where P is not limiting.",
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N1 - Acknowledgements We are indebted to Ian Alexander who initiated the fertilisation experiment with SJW; to successive researchers involved in the experiment, John Baddeley, Nanette Madan, Lars Hogbom, Bernard Moyersen, Carmen Gordon; and to field assistants, Alison Horsburgh, Andrew Coughlan, Jo Wynn, Lora Crabtree. We thank Hans Kruijer and Michael Stech for assistance with bryophyte species identification in 2011. Funding for the initial experiment was provided by the NERC Arctic Terrestrial Ecology Special Topic Programme (GR3/9424, GR9/3433) with additional support from the CEC TMR Programme, Ny-Ålesund LSF and the British Ecological Society. This recovery study was funded by NERC (NE/I016899/1). The research was made possible by use of NERC facilities at Harland Huset; special thanks to Nick Cox and colleagues for their unfailing hospitality and support.

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N2 - Summary•Arctic ecosystems are strongly nutrient limited and exhibit dramatic responses to nitrogen (N) enrichment, the reversibility of which is unknown. This study uniquely assesses the potential for tundra heath to recover from N deposition and the influence of phosphorus (P) availability on recovery.•We revisited an experiment in Svalbard, established in 1991, in which N was applied at rates representing atmospheric N deposition in Europe (10 and 50 kg N ha−1 yr−1; ‘low’ and ‘high’, respectively) for 3–8 yr. We investigated whether significant effects on vegetation composition and ecosystem nutrient status persisted up to 18 yr post-treatment.•Although the tundra heath is no longer N saturated, N treatment effects persist and are strongly P-dependent. Vegetation was more resilient to N where no P was added, although shrub cover is still reduced in low-N plots. Where P was also added (5 kg P ha−1 yr−1), there are still effects of low N on community composition and nutrient dynamics. High N, with and without P, has many lasting impacts. Importantly, N + P has caused dramatically increased moss abundance, which influences nutrient dynamics.•Our key finding is that Arctic ecosystems are slow to recover from even small N inputs, particularly where P is not limiting.

AB - Summary•Arctic ecosystems are strongly nutrient limited and exhibit dramatic responses to nitrogen (N) enrichment, the reversibility of which is unknown. This study uniquely assesses the potential for tundra heath to recover from N deposition and the influence of phosphorus (P) availability on recovery.•We revisited an experiment in Svalbard, established in 1991, in which N was applied at rates representing atmospheric N deposition in Europe (10 and 50 kg N ha−1 yr−1; ‘low’ and ‘high’, respectively) for 3–8 yr. We investigated whether significant effects on vegetation composition and ecosystem nutrient status persisted up to 18 yr post-treatment.•Although the tundra heath is no longer N saturated, N treatment effects persist and are strongly P-dependent. Vegetation was more resilient to N where no P was added, although shrub cover is still reduced in low-N plots. Where P was also added (5 kg P ha−1 yr−1), there are still effects of low N on community composition and nutrient dynamics. High N, with and without P, has many lasting impacts. Importantly, N + P has caused dramatically increased moss abundance, which influences nutrient dynamics.•Our key finding is that Arctic ecosystems are slow to recover from even small N inputs, particularly where P is not limiting.

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