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| Titel |
Dynamic nitrogen deposition thresholds during forest stand development in a Douglas fir forest analysed with two nitrogen models SMART2 and MERLIN |
| VerfasserIn |
A. Tietema, J. P. Mol-Dijkstra, J. Kros, W. Vries |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 6, no. 3 ; Nr. 6, no. 3, S.375-382 |
| Datensatznummer |
250003557
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| Publikation (Nr.) |
 copernicus.org/hess-6-375-2002.pdf |
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| Zusammenfassung |
| This study focuses on spatial variability of throughfall water
and chemistry and forest floor water content within a Douglas fir (Pseudotsuga
menziesii, Franco L.) forest plot. Spatial patterns of
water and chemistry (NH4+, NO3‾,
SO42-,
Cl‾, Mg2+, Ca2+, Na+ and K+)
were compared and tested for stability over time. The spatial coefficient of
variation (CV) was between 18 and 26% for amounts of throughfall water and ions,
and 17% for forest floor water content. Concentrations and amounts of all ions
were correlated significantly. Ion concentrations were negatively correlated
with throughfall water amounts, but, except for NH4+,
there was no such relation between throughfall water and ion amounts. Spatial
patterns of throughfall water fluxes and forest floor water contents were
consistent over time; patterns of ion fluxes were somewhat less stable. Because
of the spatial variability of forest floor thickness and drainage, it was not
possible to relate patterns in throughfall water directly to patterns in water
content. The spatial variability of throughfall nitrogen and forest floor water
contents can cause significant variability in NO3‾
production within the plot studied.
Keywords: nutrient throughfall, forest floor water, spatial variability,
time-stability, nitrogen |
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