INVESTIGADORES
GHERMANDI luciana
artículos
Título:
Post-fire seed bank dynamics in semi-arid grasslands.
Autor/es:
GONZALEZ, SOFIA & L. GHERMANDI
Revista:
PLANT ECOLOGY
Editorial:
SPRINGER
Referencias:
Año: 2008 vol. 199 p. 175 - 185
ISSN:
1385-0237
Resumen:
Abstract We evaluated the combined effects of fire
after drought on the seed bank composition and its
role in the postfire recovery of NW Patagonia
grasslands. During three years, we monitored the
seed bank and the aboveground vegetation. Species
were arranged in functional groups and Detrended
Correspondence Analysis was used to separate sites
according to species and functional groups. Similarity
between aboveground vegetation and seed bank was
calculated with SØrensen Index. In the first year, the
seed density was similar in the control and burned
sites and was lower than following years in all the
sites. The species that survived the high temperatures
were all annuals with the exception of the perennial
species Fabiana imbricata and Rumex acetosella. In
the second postfire year, the diversity and seed
density increased due to the contribution of fugitive
species (rare in the community) and exotic annual
species. Seed bank of perennial species was the most
affected by fire and just recovered in the third year.
Drought did not affect the similarity between the seed
bank and vegetation. Fire had low impact on the total
seed bank, probably due to the heat buffering nature
of the soil, whereas drought reduced significantly
seed bank size and richness. Seed bank contributes to
grassland richness maintenance.
the second postfire year, the diversity and seed
density increased due to the contribution of fugitive
species (rare in the community) and exotic annual
species. Seed bank of perennial species was the most
affected by fire and just recovered in the third year.
Drought did not affect the similarity between the seed
bank and vegetation. Fire had low impact on the total
seed bank, probably due to the heat buffering nature
of the soil, whereas drought reduced significantly
seed bank size and richness. Seed bank contributes to
grassland richness maintenance.
after drought on the seed bank composition and its
role in the postfire recovery of NW Patagonia
grasslands. During three years, we monitored the
seed bank and the aboveground vegetation. Species
were arranged in functional groups and Detrended
Correspondence Analysis was used to separate sites
according to species and functional groups. Similarity
between aboveground vegetation and seed bank was
calculated with SØrensen Index. In the first year, the
seed density was similar in the control and burned
sites and was lower than following years in all the
sites. The species that survived the high temperatures
were all annuals with the exception of the perennial
species Fabiana imbricata and Rumex acetosella. In
the second postfire year, the diversity and seed
density increased due to the contribution of fugitive
species (rare in the community) and exotic annual
species. Seed bank of perennial species was the most
affected by fire and just recovered in the third year.
Drought did not affect the similarity between the seed
bank and vegetation. Fire had low impact on the total
seed bank, probably due to the heat buffering nature
of the soil, whereas drought reduced significantly
seed bank size and richness. Seed bank contributes to
grassland richness maintenance.
the second postfire year, the diversity and seed
density increased due to the contribution of fugitive
species (rare in the community) and exotic annual
species. Seed bank of perennial species was the most
affected by fire and just recovered in the third year.
Drought did not affect the similarity between the seed
bank and vegetation. Fire had low impact on the total
seed bank, probably due to the heat buffering nature
of the soil, whereas drought reduced significantly
seed bank size and richness. Seed bank contributes to
grassland richness maintenance.
We evaluated the combined effects of fire
after drought on the seed bank composition and its
role in the postfire recovery of NW Patagonia
grasslands. During three years, we monitored the
seed bank and the aboveground vegetation. Species
were arranged in functional groups and Detrended
Correspondence Analysis was used to separate sites
according to species and functional groups. Similarity
between aboveground vegetation and seed bank was
calculated with SØrensen Index. In the first year, the
seed density was similar in the control and burned
sites and was lower than following years in all the
sites. The species that survived the high temperatures
were all annuals with the exception of the perennial
species Fabiana imbricata and Rumex acetosella. In
the second postfire year, the diversity and seed
density increased due to the contribution of fugitive
species (rare in the community) and exotic annual
species. Seed bank of perennial species was the most
affected by fire and just recovered in the third year.
Drought did not affect the similarity between the seed
bank and vegetation. Fire had low impact on the total
seed bank, probably due to the heat buffering nature
of the soil, whereas drought reduced significantly
seed bank size and richness. Seed bank contributes to
grassland richness maintenance.
the second postfire year, the diversity and seed
density increased due to the contribution of fugitive
species (rare in the community) and exotic annual
species. Seed bank of perennial species was the most
affected by fire and just recovered in the third year.
Drought did not affect the similarity between the seed
bank and vegetation. Fire had low impact on the total
seed bank, probably due to the heat buffering nature
of the soil, whereas drought reduced significantly
seed bank size and richness. Seed bank contributes to
grassland richness maintenance.
Fabiana imbricata and Rumex acetosella. In
the second postfire year, the diversity and seed
density increased due to the contribution of fugitive
species (rare in the community) and exotic annual
species. Seed bank of perennial species was the most
affected by fire and just recovered in the third year.
Drought did not affect the similarity between the seed
bank and vegetation. Fire had low impact on the total
seed bank, probably due to the heat buffering nature
of the soil, whereas drought reduced significantly
seed bank size and richness. Seed bank contributes to
grassland richness maintenance.