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Depleted 15N in hydrolysable-N of arctic soils and its implication for mycorrhizal fungi–plant interaction
Authors
A Michelsen
A Selle
+55 more
A. E. Giblin
AE Giblin
AFS Taylor
AFS Taylor
B Zeller
C Urcelay
DA Lipson
DA Walker
DJ Read
DM Sigman
DR Keeney
E. B. Rastetter
EA Hobbie
EA Hobbie
EA Hobbie
FS Chapin III
FS Chapin III
G. R. Shaver
GR Shaver
GR Shaver
GR Shaver
H Knicker
JE Hobbie
JK Friedel
JP Schimel
JP Schimel
K Kielland
K Nadelhoffer
KE Clemmensen
KE Clemmensen
KE Clemmensen
KS Emmerton
KS Emmerton
LD Hinzman
M Chalot
MG Kramer
ML Cabrera
ML Fogel
NJ Ostle
P Dijkstra
R Bol
RA Abuzinadah
RA Abuzinadah
RA Werner
RB McKane
RL Mulvaney
RM Holmes
S Smith
SA Macko
SA Macko
SJ Kerley
SJ Kerley
X Zang
X Zhang
Y. Yano
Publication date
1 August 2009
Publisher
'Springer Science and Business Media LLC'
Doi
Cite
Abstract
Author Posting. © The Author(s), 2009. This is the author's version of the work. It is posted here by permission of Springer for personal use, not for redistribution. The definitive version was published in Biogeochemistry 97 (2009): 183-194, doi:10.1007/s10533-009-9365-1.Uptake of nitrogen (N) via root-mycorrhizal associations accounts for a significant portion of total N supply to many vascular plants. Using stable isotope ratios (δ15N) and the mass balance among N pools of plants, fungal tissues, and soils, a number of efforts have been made in recent years to quantify the flux of N from mycorrhizal fungi to host plants. Current estimates of this flux for arctic tundra ecosystems rely on the untested assumption that the δ15N of labile organic N taken up by the fungi is approximately the same as the δ15N of bulk soil. We report here hydrolysable amino acids are more depleted in 15N relative to hydrolysable ammonium and amino sugars in arctic tundra soils near Toolik Lake, Alaska, USA. We demonstrate, using a case study, that recognizing the depletion in 15N for hydrolysable amino acids (δ15N = -5.6 ‰ on average) would alter recent estimates of N flux between mycorrhizal fungi and host plants in an arctic tundra ecosystem.This study was funded by NSF-DEB-0423385and NSF-DEB 0444592. Additional support was provided by Arctic Long Term Ecological Research program, funded by National Science Foundation, Division of Environmental Biology
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