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Combined climate factors alleviate changes in gross soil nitrogen dynamics in heathlands

Björsne, Anna-Karin; Rütting, Tobias and Ambus, P. (2014) In Biogeochemistry 120(1). p.191-201
Abstract
The ongoing climate change affects biogeochemical cycling in terrestrial ecosystems, but the magnitude and direction of this impact is yet unclear. To shed further light on the climate change impact, we investigated alterations in the soil nitrogen (N) cycling in a Danish heathland after 5 years of exposure to three climate change factors, i.e. warming, elevated CO2 (eCO(2)) and summer drought, applied both in isolation and in combination. By conducting laboratory N-15 tracing experiments we show that warming increased both gross N mineralization and nitrification rates. In contrast, gross nitrification was decreased by eCO(2), an effect that was more pronounced when eCO(2) was combined with warming and drought. Moreover, there was an... (More)
The ongoing climate change affects biogeochemical cycling in terrestrial ecosystems, but the magnitude and direction of this impact is yet unclear. To shed further light on the climate change impact, we investigated alterations in the soil nitrogen (N) cycling in a Danish heathland after 5 years of exposure to three climate change factors, i.e. warming, elevated CO2 (eCO(2)) and summer drought, applied both in isolation and in combination. By conducting laboratory N-15 tracing experiments we show that warming increased both gross N mineralization and nitrification rates. In contrast, gross nitrification was decreased by eCO(2), an effect that was more pronounced when eCO(2) was combined with warming and drought. Moreover, there was an interactive effect between the warming and CO2 treatment, especially for N mineralization: rates increased at warming alone but decreased at warming combined with eCO(2). In the full treatment combination, simulating the predicted climate for the year 2075, gross N transformations were only moderately affected compared to control, suggesting a minor alteration of the N cycle due to climate change. Overall, our study confirms the importance of multifactorial field experiments for a better understanding of N cycling in a changing climate, which is a prerequisite for more reliable model predictions of ecosystems responses to climate change. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
N, DYNAMICS, MODELS, N-15, Geosciences, Multidisciplinary, Environmental Sciences, Warming, Nitrogen cycle, SUMMER DROUGHT, ATMOSPHERIC CARBON-DIOXIDE, TERRESTRIAL, ECOSYSTEMS, PROCESS RESPONSES, TEMPERATE HEATHLAND, GRASSLAND SOIL, Elevated CO2, N-15 tracing, Climate change
in
Biogeochemistry
volume
120
issue
1
pages
191 - 201
publisher
Springer
external identifiers
  • scopus:84904793254
ISSN
1573-515X
DOI
10.1007/s10533-014-9990-1
project
MERGE
language
English
LU publication?
no
id
9b26d6ef-e896-46ff-b55a-be8245c67968 (old id 7515413)
date added to LUP
2015-07-08 14:51:38
date last changed
2017-11-19 04:18:21
@article{9b26d6ef-e896-46ff-b55a-be8245c67968,
  abstract     = {The ongoing climate change affects biogeochemical cycling in terrestrial ecosystems, but the magnitude and direction of this impact is yet unclear. To shed further light on the climate change impact, we investigated alterations in the soil nitrogen (N) cycling in a Danish heathland after 5 years of exposure to three climate change factors, i.e. warming, elevated CO2 (eCO(2)) and summer drought, applied both in isolation and in combination. By conducting laboratory N-15 tracing experiments we show that warming increased both gross N mineralization and nitrification rates. In contrast, gross nitrification was decreased by eCO(2), an effect that was more pronounced when eCO(2) was combined with warming and drought. Moreover, there was an interactive effect between the warming and CO2 treatment, especially for N mineralization: rates increased at warming alone but decreased at warming combined with eCO(2). In the full treatment combination, simulating the predicted climate for the year 2075, gross N transformations were only moderately affected compared to control, suggesting a minor alteration of the N cycle due to climate change. Overall, our study confirms the importance of multifactorial field experiments for a better understanding of N cycling in a changing climate, which is a prerequisite for more reliable model predictions of ecosystems responses to climate change.},
  author       = {Björsne, Anna-Karin and Rütting, Tobias and Ambus, P.},
  issn         = {1573-515X},
  keyword      = {N,DYNAMICS,MODELS,N-15,Geosciences,Multidisciplinary,Environmental Sciences,Warming,Nitrogen cycle,SUMMER DROUGHT,ATMOSPHERIC CARBON-DIOXIDE,TERRESTRIAL,ECOSYSTEMS,PROCESS RESPONSES,TEMPERATE HEATHLAND,GRASSLAND SOIL,Elevated CO2,N-15 tracing,Climate change},
  language     = {eng},
  number       = {1},
  pages        = {191--201},
  publisher    = {Springer},
  series       = {Biogeochemistry},
  title        = {Combined climate factors alleviate changes in gross soil nitrogen dynamics in heathlands},
  url          = {http://dx.doi.org/10.1007/s10533-014-9990-1},
  volume       = {120},
  year         = {2014},
}