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| Titel |
Interactions of local climatic, biotic and hydrogeochemical processes facilitate phosphorus dynamics along an Everglades forest-marsh gradient |
| VerfasserIn |
T. G. Troxler, C. Coronado-Molina, D. N. Rondeau, S. Krupa, S. Newman, M. Manna, R. M. Price, F. H. Sklar |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 4 ; Nr. 11, no. 4 (2014-02-18), S.899-914 |
| Datensatznummer |
250117231
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| Publikation (Nr.) |
 copernicus.org/bg-11-899-2014.pdf |
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| Zusammenfassung |
| Ecosystem nutrient cycling is often complex because
nutrient dynamics within and between systems are
mediated by the interaction of biological and geochemical
conditions operating at different temporal and spatial scales.
Vegetated patches in semiarid and wetland landscapes have
been shown to exemplify some of these patterns and processes.
We investigated biological and geochemical factors
suggested to contribute to phosphorus (P) movement and
availability along a forest-marsh gradient in an Everglades
tree island. Our study illustrated processes that are consistent
with the chemohydrodynamic nutrient (CHNT) hypothesis
and the trigger-transfer, pulse-reserve (TTPR) model developed
for semiarid systems. Comparison with the TTPR
model was constructive as it elaborated several significant
patterns and processes of the tree island ecosystem including:
(1) concentration of the limiting resource (P) in the
source patch (High Head which constitutes the reserve) compared
with the resource-poor landscape, (2) soil zone calcite
precipitation requiring strong seasonality for evapotranspiration
to promote conditions for secondary soil development
and calcium phosphate reprecipitation, (3) rewetting of previously
dry soils by early wet season precipitation events,
and (4) antecedent conditions of the source patch, including
landscape position that modulated the effect of the precipitation
trigger. Thus, our study showed how water availability
drives soil water P dynamics and, potentially, stability of
mineral soil P in this tree island ecosystem. In landscapes with extensive water management, these processes can be
asynchronous with the seasonality of hydrologic dynamics,
tipping the balance between a sink and source of a limiting
nutrient. |
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