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The Sensitivity of Moss-Associated Nitrogen Fixation towards Repeated Nitrogen Input
Responsible organisation
2016 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 11, no 1Article in journal (Refereed) Published
Abstract [en]

Nitrogen (N(2)) fixation is a major source of available N in ecosystems that receive low amounts of atmospheric N deposition. In boreal forest and subarctic tundra, the feather moss Hylocomium splendens is colonized by N(2) fixing cyanobacteria that could contribute fundamentally to increase the N pool in these ecosystems. However, N(2) fixation in mosses is inhibited by N input. Although this has been shown previously, the ability of N(2) fixation to grow less sensitive towards repeated, increased N inputs remains unknown. Here, we tested if N(2) fixation in H. splendens can recover from increased N input depending on the N load (0, 5, 20, 80, 320 kg N ha(-1) yr(-1)) after a period of N deprivation, and if sensitivity towards increased N input can decrease after repeated N additions. Nitrogen fixation in the moss was inhibited by the highest N addition, but was promoted by adding 5 kg N ha(-1) yr(-1), and increased in all treatments during a short period of N deprivation. The sensitivity of N(2) fixation towards repeated N additions seem to decrease in the 20 and 80 kg N additions, but increased in the highest N addition (320 kg N ha(-1) yr(-1)). Recovery of N in leachate samples increased with increasing N loads, suggesting low retention capabilities of mosses if N input is above 5 kg N ha(-1) yr(-1). Our results demonstrate that the sensitivity towards repeated N additions is likely to decrease if N input does not exceed a certain threshold.

Place, publisher, year, edition, pages
2016. Vol. 11, no 1
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Natural Sciences
Identifiers
URN: urn:nbn:se:polar:diva-3508DOI: 10.1371/journal.pone.0146655OAI: oai:DiVA.org:polar-3508DiVA: diva2:1083489
Note

26731691[pmid]; PONE-D-15-47639[PII]

Available from: 2017-03-21 Created: 2017-03-21 Last updated: 2017-03-21

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Publisher's full texthttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC4712137/
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CiteExportLink to record
Permanent link

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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
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  • fi-FI
  • nn-NO
  • nn-NB
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