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Exposure to nitrogen does not eliminate N-2 fixation in the feather moss Pleurozium schreberi (Brid.) Mitt.

Rousk, Kathrin LU ; Jones, Davey L. and DeLuca, Thomas H. (2014) In Plant and Soil 374(1-2). p.513-521
Abstract
The feather moss Pleurozium schreberi (Brid.) Mitt. is colonized by cyanobacteria, which fix substantial amounts of atmospheric nitrogen (N) in pristine and N-poor ecosystems. Cyanobacterial N-2 fixation is inhibited by N deposition. However, the threshold of N input that leads to the inhibition of N-2 fixation has not been adequately investigated. Further, the ability of N-2 fixation to recover in mosses from high N deposition areas has not been studied to date. We conducted two laboratory studies in which we (1) applied a range of concentrations of N as NH4NO3 to mosses from low N-deposition areas, and (2) we deprived mosses from a high N-deposition area of N to test their ability to recover N-2 fixation. Higher addition rates (up to 10... (More)
The feather moss Pleurozium schreberi (Brid.) Mitt. is colonized by cyanobacteria, which fix substantial amounts of atmospheric nitrogen (N) in pristine and N-poor ecosystems. Cyanobacterial N-2 fixation is inhibited by N deposition. However, the threshold of N input that leads to the inhibition of N-2 fixation has not been adequately investigated. Further, the ability of N-2 fixation to recover in mosses from high N deposition areas has not been studied to date. We conducted two laboratory studies in which we (1) applied a range of concentrations of N as NH4NO3 to mosses from low N-deposition areas, and (2) we deprived mosses from a high N-deposition area of N to test their ability to recover N-2 fixation. Higher addition rates (up to 10 kg N ha(-1)) did not systematically inhibit N-2 fixation in P. schreberi. Conversely, upon weeks of N deprivation of mosses from a high N environment, N-2 fixation rates increased. The threshold of total N deposition above which N-2 fixation in P. schreberi is inhibited is likely to be > 10 kg N ha(-1). Further, cyanobacteria are able to recover from high N inputs and are able to fix atmospheric N-2 after a period of N deprivation. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Boreal forests, Bryophytes, Cyanobacteria, Nitrogenase activity, N, deposition, Symbiosis
in
Plant and Soil
volume
374
issue
1-2
pages
513 - 521
publisher
Springer
external identifiers
  • wos:000328849200039
  • scopus:84890861355
ISSN
0032-079X
DOI
10.1007/s11104-013-1908-5
language
English
LU publication?
yes
id
de3acfee-bd95-443a-bdcb-8bd9438665c1 (old id 4255907)
date added to LUP
2014-02-10 13:24:45
date last changed
2017-03-26 04:04:20
@article{de3acfee-bd95-443a-bdcb-8bd9438665c1,
  abstract     = {The feather moss Pleurozium schreberi (Brid.) Mitt. is colonized by cyanobacteria, which fix substantial amounts of atmospheric nitrogen (N) in pristine and N-poor ecosystems. Cyanobacterial N-2 fixation is inhibited by N deposition. However, the threshold of N input that leads to the inhibition of N-2 fixation has not been adequately investigated. Further, the ability of N-2 fixation to recover in mosses from high N deposition areas has not been studied to date. We conducted two laboratory studies in which we (1) applied a range of concentrations of N as NH4NO3 to mosses from low N-deposition areas, and (2) we deprived mosses from a high N-deposition area of N to test their ability to recover N-2 fixation. Higher addition rates (up to 10 kg N ha(-1)) did not systematically inhibit N-2 fixation in P. schreberi. Conversely, upon weeks of N deprivation of mosses from a high N environment, N-2 fixation rates increased. The threshold of total N deposition above which N-2 fixation in P. schreberi is inhibited is likely to be > 10 kg N ha(-1). Further, cyanobacteria are able to recover from high N inputs and are able to fix atmospheric N-2 after a period of N deprivation.},
  author       = {Rousk, Kathrin and Jones, Davey L. and DeLuca, Thomas H.},
  issn         = {0032-079X},
  keyword      = {Boreal forests,Bryophytes,Cyanobacteria,Nitrogenase activity,N,deposition,Symbiosis},
  language     = {eng},
  number       = {1-2},
  pages        = {513--521},
  publisher    = {Springer},
  series       = {Plant and Soil},
  title        = {Exposure to nitrogen does not eliminate N-2 fixation in the feather moss Pleurozium schreberi (Brid.) Mitt.},
  url          = {http://dx.doi.org/10.1007/s11104-013-1908-5},
  volume       = {374},
  year         = {2014},
}