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Feedback from soil inorganic nitrogen on soil organic matter mineralisation and growth in a boreal forest ecosystem

Eliasson, Peter LU and Ågren, Göran I (2011) In Plant and Soil 338(1-2). p.193-203
Abstract
Current nitrogen (N) deposition rates are considerably higher than during pre- industrial times and the growing interest in forest fertilisation requires better understanding of how the N and carbon (C) cycles interact. This study is based on experimental data showing how Scots pine (Pinus sylvestris L.) forests respond to single or consecutive pulse doses of N. The data were used to support the implementation of a dynamic feedback mechanism in the Q model, allowing for changes in soil N availability to regulate the rate of decomposer efficiency. Simulations of the long-term effects of slowly increasing N deposition with and without dynamic decomposer efficiency were then compared. Both versions of the model accurately predicted the... (More)
Current nitrogen (N) deposition rates are considerably higher than during pre- industrial times and the growing interest in forest fertilisation requires better understanding of how the N and carbon (C) cycles interact. This study is based on experimental data showing how Scots pine (Pinus sylvestris L.) forests respond to single or consecutive pulse doses of N. The data were used to support the implementation of a dynamic feedback mechanism in the Q model, allowing for changes in soil N availability to regulate the rate of decomposer efficiency. Simulations of the long-term effects of slowly increasing N deposition with and without dynamic decomposer efficiency were then compared. Both versions of the model accurately predicted the response of tree growth to N fertilisation. Slowly increasing inputs of N over a century in the modified version acted on the inputs and outputs of soil C in opposing ways: (a) rate of litter input slowed down because more N was retained in the soil and thus not available for tree growth; (b) rate of C output, through soil heterotrophic respiration, was also gradually reduced due to increasing decomposer efficiency, although not enough to sufficiently balance the reduced litter input. Accurate prediction of the amount of added N retained in the ecosystem seems to be one of the key issues for estimating enhanced C sequestration. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
deposition, saturation, norway spruce, lodgepole pine, litter decomposition, repeated fertilization, scots pine, feedback, soil organic matter, nitrogen cycle, fertilisation, carbon sequestration, decomposer efficiency, productivity, temperate
in
Plant and Soil
volume
338
issue
1-2
pages
193 - 203
publisher
Springer
external identifiers
  • scopus:78650310698
ISSN
0032-079X
DOI
10.1007/s11104-010-0478-z
language
English
LU publication?
no
id
a91e3468-cec9-4636-a00e-529beabfd134 (old id 3808628)
alternative location
http://link.springer.com/article/10.1007%2Fs11104-010-0478-z
http://apps.webofknowledge.com/full_record.do?product=WOS&search_mode=OneClickSearch&qid=3&SID=V2beF69pkF3BfBnEIA4&page=1&doc=2
date added to LUP
2013-06-27 20:51:57
date last changed
2017-01-01 06:19:56
@article{a91e3468-cec9-4636-a00e-529beabfd134,
  abstract     = {Current nitrogen (N) deposition rates are considerably higher than during pre- industrial times and the growing interest in forest fertilisation requires better understanding of how the N and carbon (C) cycles interact. This study is based on experimental data showing how Scots pine (Pinus sylvestris L.) forests respond to single or consecutive pulse doses of N. The data were used to support the implementation of a dynamic feedback mechanism in the Q model, allowing for changes in soil N availability to regulate the rate of decomposer efficiency. Simulations of the long-term effects of slowly increasing N deposition with and without dynamic decomposer efficiency were then compared. Both versions of the model accurately predicted the response of tree growth to N fertilisation. Slowly increasing inputs of N over a century in the modified version acted on the inputs and outputs of soil C in opposing ways: (a) rate of litter input slowed down because more N was retained in the soil and thus not available for tree growth; (b) rate of C output, through soil heterotrophic respiration, was also gradually reduced due to increasing decomposer efficiency, although not enough to sufficiently balance the reduced litter input. Accurate prediction of the amount of added N retained in the ecosystem seems to be one of the key issues for estimating enhanced C sequestration.},
  author       = {Eliasson, Peter and Ågren, Göran I},
  issn         = {0032-079X},
  keyword      = {deposition,saturation,norway spruce,lodgepole pine,litter decomposition,repeated fertilization,scots pine,feedback,soil organic matter,nitrogen cycle,fertilisation,carbon sequestration,decomposer efficiency,productivity,temperate},
  language     = {eng},
  number       = {1-2},
  pages        = {193--203},
  publisher    = {Springer},
  series       = {Plant and Soil},
  title        = {Feedback from soil inorganic nitrogen on soil organic matter mineralisation and growth in a boreal forest ecosystem},
  url          = {http://dx.doi.org/10.1007/s11104-010-0478-z},
  volume       = {338},
  year         = {2011},
}