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| Titel |
Rainfall intermittency and vegetation feedbacks in drylands |
| VerfasserIn |
M. Baudena, A. Provenzale |
| 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 ; 12, no. 2 ; Nr. 12, no. 2 (2008-04-14), S.679-689 |
| Datensatznummer |
250010586
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| Publikation (Nr.) |
 copernicus.org/hess-12-679-2008.pdf |
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| Zusammenfassung |
| We discuss a simplifed, conceptual model for the dynamics of the
soil-vegetation system in drylands. The model considers
the different dynamical processes taking place in vegetated and
non-vegetated soil and it distinguishes between the upper soil
layer, where rapid evaporation dominates, and the deeper root
layer where only plant transpiration takes place. We explore the
role of rainfall intermittency and of different plant colonization
strategies, and discuss in detail the effect of two different vegetation
feedbacks: reduced evaporation due to plant shading and
increased infiltration in vegetated areas. The results of the analysis indicate
that both temporal rainfall intermittency and the shading/infiltration
feedbacks have a beneficial effect on vegetation. However, it
turns out that in this
model rainfall intermittency and vegetation feedbacks have almost a
mutually exclusive role: whenever one of these
two components is present,
the addition of the other does not further affect
vegetation dynamics in a significant way. |
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