Data/hora: 04/06/2024 06:30:51

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 03/04/1995
Data da última atualização: | 04/04/2017
Autoria: | GIBSON, D. J.; HARTNETT, D. C.; MERRILL, G. L. S.
Título: | Fire temperature heterogeneity in contrasting fire prone habitats: Kansas tallgrass prairie and Florida sandhill.
Ano de publicação: | 1990
Fonte/Imprenta: | Bulletin of the Torrey Botanical Club, v.117, n.4, p.349-356, 1990.
Idioma: | Inglês
Conteúdo: | Spatial patterns of fire temperatures from a tallgrass prairie and adjacent Gallery forest in northeast Kansas and a sandhill community in central Florida were recorded using temperature-sensitive pyrometers. The objectives of the study were to determine in both habitats the range of temperatures reached during prescribed burning under a range of different conditions. Both habitats are characterized by frequent, low-intensity fires to the herbaceous vegetation and low shrubs. In tallgrass prairie, fiore temperature maxima ranged from 19 to 399C (n=243). The highest temperatures were associated with fires in isolated tree and shrub canopies (399C). Fires were hotter in headfires compared with backfires (47C difference) on lowlands compared with uplands (12C difference) and in areas that had not been burned for many years compared with areas burned annually (34C difference). In the Florida sandhill fire temperature maxima ranged from 35 to 538C (n=240), with the highest temperatures recorded at ground level in sites which had not been burned for a least 5 years. Compared with frequently burned areas, areas that have not burnet for many years build up high fuel loads that a more homogeneous, hotter fire. In the tallgrass prairie, homogeneity of fire temperatures was greatest in areas of intermediate fire frequencies. The greater spatial heterogeneity in fire characteristics of prairie with very high fire frequency (annual fire) and very low frequency (>15 years between fires) is likely a result of low fuel loads and more patchy vegetation structure, respectively. In sandhill, low fuel loads and patchy distribution of fuel contribute to high spatial variability in fire temperatures in annually burned sites.
Palavras-Chave: | Ambiente; Fire; Grassland; Sandhill.
Thesagro: | Floresta; Pastagem; Queimada; Temperatura.
Thesaurus Nal: | temperature.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (27886-1) - ADD - SP - PP - SP14193 -  - 14193 - DIS