INVESTIGADORES
DEFOSSE Guillermo Emilio
artículos
Título:
The relative sensitivity of two bunchgrass species to fire.
Autor/es:
ROBBERECHT, R.; DEFOSSÉ G. E.
Revista:
INTERNATIONAL JOURNAL OF WILDLAND FIRE
Editorial:
CSIRO PUBLISHING
Referencias:
Lugar: Collingwood; Año: 1995 vol. 5 p. 127 - 134
ISSN:
1049-8001
Resumen:
The
response of two bunchgrass species, Festuca
idahoensis and Agropyron spicatum, to
fire was examined under three levels of fire severity. The fire treatment was applied with an
instrument system that allowed precise control over the intensity and duration
of fire, and full documentation of the temperatures experienced in various
regions of each plant during the fire and the postfire cooling phases. A quantitative index of fire exposure, or severity,
for each plant was obtained by integrating the temperature curve for the
meristematic crown region over the fire and postfire cooling periods. No significant plant mortality was observed
at any fire severity level. Although
tissue damage in newly initiated culms were observed for Festuca, this did not significantly affect culm or biomass productivity. Culm production was initiated earlier and
more rapidly for Festuca than for Agropyron, and within 60 days after fire
exposure the total number of culms produced in Festuca was nearly that of unburned plants. Aboveground biomass for both species was
significantly less than unburned plants at the end of this 60-day period. Agropyron exhibited
significantly less culm and biomass production at a moderately fire severity,
whereas high fire severity was required for this reduction in Festuca. Contrary to previous studies, Festuca thus appears as less sensitive
to fire than Agropyron.