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Ten years of elevated atmospheric carbon dioxide alters soil nitrogen transformations in a sheep-grazed pasture

Rutting, T; Clough, TJ; Muller, C; Lieffering, M and Newton, PCD (2010) In Global Change Biology 16(9). p.2530-2542
Abstract
The increasing concentration of atmospheric carbon dioxide (CO(2)) is expected to lead to enhanced competition between plants and microorganisms for the available nitrogen (N) in soil. Here, we present novel results from a 15N tracing study conducted with a sheep-grazed pasture soil that had been under 10 years of CO(2) enrichment. Our study aimed to investigate changes in process-specific gross N transformations in a soil previously exposed to an elevated atmospheric CO(2) (eCO(2)) concentration and to examine indicators for the occurrence of progressive nitrogen limitation (PNL). Our results show that the mineralization-immobilization turnover (MIT) was enhanced under eCO(2), which was driven by the mineralization of recalcitrant organic... (More)
The increasing concentration of atmospheric carbon dioxide (CO(2)) is expected to lead to enhanced competition between plants and microorganisms for the available nitrogen (N) in soil. Here, we present novel results from a 15N tracing study conducted with a sheep-grazed pasture soil that had been under 10 years of CO(2) enrichment. Our study aimed to investigate changes in process-specific gross N transformations in a soil previously exposed to an elevated atmospheric CO(2) (eCO(2)) concentration and to examine indicators for the occurrence of progressive nitrogen limitation (PNL). Our results show that the mineralization-immobilization turnover (MIT) was enhanced under eCO(2), which was driven by the mineralization of recalcitrant organic N. The retention of N in the grassland was enhanced by increased dissimilatory NO(3)- reduction to NH(4)+ (DNRA) and decreased NH(4)+ oxidation. Our results indicate that heterotrophic processes become more important under eCO(2). We conclude that higher MIT of recalcitrant organic N and enhanced N retention are mechanisms that may alleviate PNL in grazed temperate grassland. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
elevated CO(2), grazing, gross N transformation, model, 15N tracing, progressive N limitation, soil, temperate grassland
in
Global Change Biology
volume
16
issue
9
pages
2530 - 2542
publisher
Wiley-Blackwell
external identifiers
  • scopus:77955236237
ISSN
1354-1013
DOI
10.1111/j.1365-2486.2009.02089.x
project
BECC
language
English
LU publication?
no
id
eb9d1d2e-b89d-4c16-bd17-547eccb8e697 (old id 4448802)
date added to LUP
2014-05-23 12:11:32
date last changed
2018-07-15 03:19:42
@article{eb9d1d2e-b89d-4c16-bd17-547eccb8e697,
  abstract     = {The increasing concentration of atmospheric carbon dioxide (CO(2)) is expected to lead to enhanced competition between plants and microorganisms for the available nitrogen (N) in soil. Here, we present novel results from a 15N tracing study conducted with a sheep-grazed pasture soil that had been under 10 years of CO(2) enrichment. Our study aimed to investigate changes in process-specific gross N transformations in a soil previously exposed to an elevated atmospheric CO(2) (eCO(2)) concentration and to examine indicators for the occurrence of progressive nitrogen limitation (PNL). Our results show that the mineralization-immobilization turnover (MIT) was enhanced under eCO(2), which was driven by the mineralization of recalcitrant organic N. The retention of N in the grassland was enhanced by increased dissimilatory NO(3)- reduction to NH(4)+ (DNRA) and decreased NH(4)+ oxidation. Our results indicate that heterotrophic processes become more important under eCO(2). We conclude that higher MIT of recalcitrant organic N and enhanced N retention are mechanisms that may alleviate PNL in grazed temperate grassland.},
  author       = {Rutting, T and Clough, TJ and Muller, C and Lieffering, M and Newton, PCD},
  issn         = {1354-1013},
  keyword      = {elevated CO(2),grazing,gross N transformation,model,15N tracing,progressive N limitation,soil,temperate grassland},
  language     = {eng},
  number       = {9},
  pages        = {2530--2542},
  publisher    = {Wiley-Blackwell},
  series       = {Global Change Biology},
  title        = {Ten years of elevated atmospheric carbon dioxide alters soil nitrogen transformations in a sheep-grazed pasture},
  url          = {http://dx.doi.org/10.1111/j.1365-2486.2009.02089.x},
  volume       = {16},
  year         = {2010},
}