INVESTIGADORES
GHERMANDI Luciana
artículos
Título:
Fire effect on two perennial grasses from northwestern Patagonian grasslands.
Autor/es:
GONZALEZ S.; GHERMANDI L.; PELAEZ D.
Revista:
ECOLOGICAL RESEARCH
Editorial:
SPRINGER TOKYO
Referencias:
Lugar: Tokyo; Año: 2014
ISSN:
0912-3814
Resumen:
Abstract Post-fire recovery of perennial plants depends
17 on their capacity to regrow from surviving meristems.
18 Plants are adapted to a particular fire regime, which can
19 be altered by human activities and climatic change.
20 Therefore, predicting the impact of changing fire regimes
21 on post-fire vegetation recovery has become a major
22 ecological concern. We studied the effects of fire tem-
23 perature on survival and growth of the dominant tus-
24 sock grasses Festuca pallescens and Pappostipa speciosa
25 for two post-fire growing seasons in NW Patagonian
26 grasslands. Using a portable propane burner, we applied
27 two fire temperature treatments to individual plants:
28 200?500 C (low temperature) and 500?900 C (high
29 temperature). Plant mortality was higher in F. pallescens
30 than in P. speciosa, possibly due to morphological dif-
31 ferences. Fire damaged active meristems in both species,
32 which delayed emergence of new tillers. This in turn
33 affected leaf length of tillers, which was lower in burned
34 plants during the first growing season. Despite this,
35 growth rate was higher in burned plants once they re-
36 grow only during the first growing season. In summer,
37 post-fire hot and dry conditions affected F. pallescens
38 survival. Although fire temperature affected negatively
39 F. pallescens survival, both tussock grasses recovered
40 quickly after the experimental burns. This response
41 could favour their persistence and dominance in the
42 community. Our study increases understanding of post-
43 fire responses in grasslands and will provide important
44 rangeland management information for grasslands in
45 Patagonia.