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Microbial recycling of dissolved organic matter confines plant nitrogen uptake to inorganic forms in a semi-arid ecosystem

Dries Huygens UGent, S. Diaz, C. Urcelay and Pascal Boeckx UGent (2016) SOIL BIOLOGY & BIOCHEMISTRY. 101. p.142-151
abstract
Plant uptake of dissolved organic nitrogen (DON) has been proposed to explain inconsistency in the ecosystem N balance of semi-arid systems. Nevertheless, direct evidence for an ecologically important role of DON in plant nutrition in these systems remains elusive under field conditions. Here, natural abundance N-15 signatures of NO3-, NH4+, DON and whole plants from a semi-arid model forest were analyzed to provide robust estimates of plant N source partitioning and relative N cycling rates under in situ conditions. Concurrently, architectural and symbiotic root traits were determined to assess their relationship to plant N acquisition strategies. Bayesian isotope mixing models indicated an insignificant contribution of DON to ecosystem plant N nutrition. Nitrate was the dominant plant N source in this ecosystem, while the contribution of NH4+ to plant nutrition varied between herbaceous (26%) and woody plants (8%). The low C:N ratio of the dissolved organic matter pool - ranging from 12.7 to 4.9 within the soil profile indicated microbial C-limitation in this ecosystem. Dissolved organic N was significantly enriched in N-15 relative to NH4+ and NO3-, corroborating the importance of dissolved organic matter recycling as a cost-effective pathway that simultaneously supplies C and nutrients for microbial metabolism. Plants exclusively depend on inorganic N forms made available through microbial N mineralization and free-living atmospheric N-2 fixation, followed by autotrophic nitrification. (C) 2016 Elsevier Ltd. All rights reserved.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
journal title
SOIL BIOLOGY & BIOCHEMISTRY
volume
101
pages
142 - 151
Web of Science type
J
Web of Science id
000383300200016
ISSN
0038-0717
DOI
10.1016/j.soilbio.2016.07.006
UGent publication?
yes
classification
U
copyright statement
I don't know the status of the copyright for this publication
id
8520925
handle
http://hdl.handle.net/1854/LU-8520925
date created
2017-05-19 13:00:29
date last changed
2017-05-19 13:00:29
@article{8520925,
  abstract     = {Plant uptake of dissolved organic nitrogen (DON) has been proposed to explain inconsistency in the ecosystem N balance of semi-arid systems. Nevertheless, direct evidence for an ecologically important role of DON in plant nutrition in these systems remains elusive under field conditions. Here, natural abundance N-15 signatures of NO3-, NH4+, DON and whole plants from a semi-arid model forest were analyzed to provide robust estimates of plant N source partitioning and relative N cycling rates under in situ conditions. Concurrently, architectural and symbiotic root traits were determined to assess their relationship to plant N acquisition strategies. Bayesian isotope mixing models indicated an insignificant contribution of DON to ecosystem plant N nutrition. Nitrate was the dominant plant N source in this ecosystem, while the contribution of NH4+ to plant nutrition varied between herbaceous (26\%) and woody plants (8\%). The low C:N ratio of the dissolved organic matter pool - ranging from 12.7 to 4.9 within the soil profile indicated microbial C-limitation in this ecosystem. Dissolved organic N was significantly enriched in N-15 relative to NH4+ and NO3-, corroborating the importance of dissolved organic matter recycling as a cost-effective pathway that simultaneously supplies C and nutrients for microbial metabolism. Plants exclusively depend on inorganic N forms made available through microbial N mineralization and free-living atmospheric N-2 fixation, followed by autotrophic nitrification. (C) 2016 Elsevier Ltd. All rights reserved.},
  author       = {Huygens, Dries and Diaz, S. and Urcelay, C. and Boeckx, Pascal},
  issn         = {0038-0717},
  journal      = {SOIL BIOLOGY \& BIOCHEMISTRY},
  pages        = {142--151},
  title        = {Microbial recycling of dissolved organic matter confines plant nitrogen uptake to inorganic forms in a semi-arid ecosystem},
  url          = {http://dx.doi.org/10.1016/j.soilbio.2016.07.006},
  volume       = {101},
  year         = {2016},
}

Chicago
Huygens, Dries, S. Diaz, C. Urcelay, and Pascal Boeckx. 2016. “Microbial Recycling of Dissolved Organic Matter Confines Plant Nitrogen Uptake to Inorganic Forms in a Semi-arid Ecosystem.” Soil Biology & Biochemistry 101: 142–151.
APA
Huygens, Dries, Diaz, S., Urcelay, C., & Boeckx, P. (2016). Microbial recycling of dissolved organic matter confines plant nitrogen uptake to inorganic forms in a semi-arid ecosystem. SOIL BIOLOGY & BIOCHEMISTRY, 101, 142–151.
Vancouver
1.
Huygens D, Diaz S, Urcelay C, Boeckx P. Microbial recycling of dissolved organic matter confines plant nitrogen uptake to inorganic forms in a semi-arid ecosystem. SOIL BIOLOGY & BIOCHEMISTRY. 2016;101:142–51.
MLA
Huygens, Dries, S. Diaz, C. Urcelay, et al. “Microbial Recycling of Dissolved Organic Matter Confines Plant Nitrogen Uptake to Inorganic Forms in a Semi-arid Ecosystem.” SOIL BIOLOGY & BIOCHEMISTRY 101 (2016): 142–151. Print.