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| Titel |
The role of tectonic uplift, climate, and vegetation in the long-term terrestrial phosphorous cycle |
| VerfasserIn |
C. Buendía, A. Kleidon, A. Porporato |
| 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 ; 7, no. 6 ; Nr. 7, no. 6 (2010-06-25), S.2025-2038 |
| Datensatznummer |
250004853
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| Publikation (Nr.) |
 copernicus.org/bg-7-2025-2010.pdf |
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| Zusammenfassung |
| Phosphorus (P) is a crucial element for life and therefore for
maintaining ecosystem productivity. Its local availability to the
terrestrial biosphere results from the interaction between climate,
tectonic uplift, atmospheric transport, and biotic cycling. Here we
present a mathematical model that describes the terrestrial P-cycle
in a simple but comprehensive way. The resulting dynamical system
can be solved analytically for steady-state conditions, allowing us
to test the sensitivity of the P-availability to the key parameters
and processes. Given constant inputs, we find that humid ecosystems
exhibit lower P availability due to higher runoff and losses, and
that tectonic uplift is a fundamental constraint. In particular, we
find that in humid ecosystems the biotic cycling seem essential to
maintain long-term P-availability. The time-dependent P dynamics for
the Franz Josef and Hawaii chronosequences show how tectonic uplift
is an important constraint on ecosystem productivity, while
hydroclimatic conditions control the P-losses and speed towards
steady-state. The model also helps describe how, with limited uplift
and atmospheric input, as in the case of the Amazon Basin,
ecosystems must rely on mechanisms that enhance P-availability and
retention. Our novel model has a limited number of parameters and
can be easily integrated into global climate models to provide a
representation of the response of the terrestrial biosphere to
global change. |
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