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Titel |
Spatial relationship between δ15N and elevation in agricultural landscapes |
VerfasserIn |
A. Biswas, B. C. Si, F. L. Walley |
Medientyp |
Artikel
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Sprache |
Englisch
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ISSN |
1023-5809
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Digitales Dokument |
URL |
Erschienen |
In: Nonlinear Processes in Geophysics ; 15, no. 3 ; Nr. 15, no. 3 (2008-05-13), S.397-407 |
Datensatznummer |
250012656
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Publikation (Nr.) |
copernicus.org/npg-15-397-2008.pdf |
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Zusammenfassung |
Understanding of the nitrogen (N) cycle and its spatial variability is
important for managing ecosystems. Soil δ15N, as an important
indicator of different soil nitrogen cycling processes, may provide critical
information about the spatial variability in soil N cycling. The objective
of this study was to examine the dominant landscape scale variability of
δ15N, the location of the variability and its spatial
relationship with elevation. Soil δ15N and elevation were
measured along two transects (Davidson and Elstow, Saskatchewan, Canada).
Each transect had 128 points with 3 m sampling intervals. Higher δ15N values typically occurred in topographic depressions as compared
to knolls. The coefficient of determination revealed a significant linear
relationship between δ15N and elevation (r2=0.27) at
Davidson whereas no relationship (r2=0.00) was detected for the Elstow
transect. However, wavelet spectra, cross wavelet, and squared wavelet
coherency analysis revealed spatial relationships between δ15N
and elevation at both sites. A strong coherency between δ15N
and elevation at large scales (96 m or more) was detected for both
transects. The Davidson transect showed an out of phase coherency at a
topographically elevated area at the beginning and the end of the transect.
The Elstow transect had a strong out of phase correlation (negative
relationship) at the middle of the transect (corresponding to a depressions)
indicating a location dependent relationship between δ15N and
elevation. The relationship between δ15N and elevation reflects
the effects of hydrology and soil water content over the landscape on N
cycling processes. |
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