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Título: Storm intensity and old-growth forest disturbances in the Amazon region
Autor(es): Espírito-Santo, F. D. B.
Michael Keller
Braswell, B.
Bruce Walker Nelson
S. Frolking
G. Vicente
ISSN: 0094-8276
Revista: Geophysical Research Letters
Volume: 37
Resumo: We analyzed the pattern of large forest disturbances or blow-downs apparently caused by severe storms in a mostly unmanaged portion of the Brazilian Amazon using 27 Landsat images and daily precipitation estimates from NOAA satellite data. For each Landsat a spectral mixture analysis (SMA) was applied. Based on SMA, we detected and mapped 279 patches (from 5 ha to 2,223 ha) characteristic of blow-downs. A total of 21,931 ha of forest were disturbed. We found a strong correlation between occurrence of blow-downs and frequency of heavy rainfall (Spearman's rank, r(2) = 0.84, p < 0.0003). The recurrence intervals of large disturbances were estimated to be 90,000 yr for the eastern Amazon and 27,000 yr for the western Amazon. This suggests that weather patterns affect the frequency of large forest disturbances that may produce different rates of forest turnover in the eastern and western Amazon basin. Citation: Esp rito-Santo, F. D. B., M. Keller, B. Braswell, B. W. Nelson, S. Frolking, and G. Vicente (2010), Storm intensity and old-growth forest disturbances in the Amazon region, Geophys. Res. Lett., 37, L11403, doi:10.1029/2010GL043146.
ISSN: 0094-8276
Aparece nas coleções:Coordenação de Dinâmica Ambiental (CDAM)

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