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| Titel |
Modelling post-fire vegetation recovery in Portugal |
| VerfasserIn |
A. Bastos, C. M. Gouveia, C. C. Dacamara, R. M. Trigo |
| 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 ; 8, no. 12 ; Nr. 8, no. 12 (2011-12-12), S.3593-3607 |
| Datensatznummer |
250006243
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| Publikation (Nr.) |
 copernicus.org/bg-8-3593-2011.pdf |
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| Zusammenfassung |
Wildfires in Mediterranean Europe have been increasing in number and
extension over the last decades and constitute one of the major disturbances
of these ecosystems. Portugal is the country with more burnt area in the
last decade and the years of 2003 and 2005 were particularly devastating,
the total burned areas of 425 000 and 338 000 ha being several times higher
than the corresponding average. The year of 2005 further coincided with one
of the most severe droughts since early 20th century. Due to different
responses of vegetation to diverse fire regimes and to the complexity of
landscape structures, fires have complex effects on vegetation recovery.
Remote sensing has revealed to be a powerful tool in studying vegetation
dynamics and in monitoring post-fire vegetation recovery, which is crucial
to land-management and to prevent erosion.
The main goals of the present work are (i) to assess the accuracy of a
vegetation recovery model previously developed by the authors; (ii) to
assess the model's performance, namely its sensitivity to initial
conditions, to the temporal length of the input dataset and to missing data;
(iii) to study vegetation recovery over two selected areas that were
affected by two large wildfire events in the fire seasons of 2003 and 2005,
respectively.
The study relies on monthly values of NDVI over 11 years (1998–2009), at
1 km × 1 km spatial resolution, as obtained by the VEGETATION
instrument. According to results from sensitivity analysis, the model is
robust and able to provide good estimations of recovery times of vegetation
when the regeneration process is regular, even when missing data is present.
In respect to the two selected burnt scars, results indicate that fire
damage is a determinant factor of regeneration, as less damaged vegetation
recovers more rapidly, which is mainly justified by the high coverage of
Pinus pinaster over the area, and by the fact that coniferous forests tend to recover
slower than transitional woodland-shrub, which tend to dominate the areas
following the fire event. |
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