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Effects of N and P fertilization on the greenhouse gas exchange in two northern peatlands with contrasting N deposition rates

Lund, Magnus LU ; Christensen, Torben LU ; Mastepanov, Mikhail LU ; Lindroth, Anders LU and Ström, Lena LU (2009) In Biogeosciences 6(10). p.2135-2144
Abstract
Peatlands are important ecosystems in the context of biospheric feedback to climate change, due to the large storage of organic C in peatland soils. Nitrogen deposition and increased nutrient availability in soils following climate warming may cause changes in these ecosystems affecting greenhouse gas exchange. We have conducted an N and P fertilization experiment in two Swedish bogs subjected to high and low background N deposition, and measured the exchange of CO2, CH4 and N2O using the closed chamber technique. During the second year of fertilization, both gross primary production and ecosystem respiration were significantly increased by N addition in the northernmost site where background N deposition is low, while gross primary... (More)
Peatlands are important ecosystems in the context of biospheric feedback to climate change, due to the large storage of organic C in peatland soils. Nitrogen deposition and increased nutrient availability in soils following climate warming may cause changes in these ecosystems affecting greenhouse gas exchange. We have conducted an N and P fertilization experiment in two Swedish bogs subjected to high and low background N deposition, and measured the exchange of CO2, CH4 and N2O using the closed chamber technique. During the second year of fertilization, both gross primary production and ecosystem respiration were significantly increased by N addition in the northernmost site where background N deposition is low, while gross primary production was stimulated by P addition in the southern high N deposition site. In addition, a short-term response in respiration was seen following fertilization in both sites, probably associated with rapid growth of nutrient-limited soil microorganisms. No treatment effect was seen on the CH4 exchange, while N2O emission peaks were detected in N fertilized plots indicating the importance of taking N2O into consideration under increased N availability. In a longer term, increased nutrient availability will cause changes in plant composition, which will further act to regulate the peatland greenhouse gas exchange. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Biogeosciences
volume
6
issue
10
pages
2135 - 2144
publisher
Copernicus Publications
external identifiers
  • wos:000271354900012
  • scopus:77953551236
ISSN
1726-4189
project
Climate Initiative
language
English
LU publication?
yes
id
e7ae3e7a-a676-465b-ada1-4ecd8554d743 (old id 1505195)
date added to LUP
2009-11-24 16:20:06
date last changed
2017-10-01 03:37:42
@article{e7ae3e7a-a676-465b-ada1-4ecd8554d743,
  abstract     = {Peatlands are important ecosystems in the context of biospheric feedback to climate change, due to the large storage of organic C in peatland soils. Nitrogen deposition and increased nutrient availability in soils following climate warming may cause changes in these ecosystems affecting greenhouse gas exchange. We have conducted an N and P fertilization experiment in two Swedish bogs subjected to high and low background N deposition, and measured the exchange of CO2, CH4 and N2O using the closed chamber technique. During the second year of fertilization, both gross primary production and ecosystem respiration were significantly increased by N addition in the northernmost site where background N deposition is low, while gross primary production was stimulated by P addition in the southern high N deposition site. In addition, a short-term response in respiration was seen following fertilization in both sites, probably associated with rapid growth of nutrient-limited soil microorganisms. No treatment effect was seen on the CH4 exchange, while N2O emission peaks were detected in N fertilized plots indicating the importance of taking N2O into consideration under increased N availability. In a longer term, increased nutrient availability will cause changes in plant composition, which will further act to regulate the peatland greenhouse gas exchange.},
  author       = {Lund, Magnus and Christensen, Torben and Mastepanov, Mikhail and Lindroth, Anders and Ström, Lena},
  issn         = {1726-4189},
  language     = {eng},
  number       = {10},
  pages        = {2135--2144},
  publisher    = {Copernicus Publications},
  series       = {Biogeosciences},
  title        = {Effects of N and P fertilization on the greenhouse gas exchange in two northern peatlands with contrasting N deposition rates},
  volume       = {6},
  year         = {2009},
}