INVESTIGADORES
GHERMANDI luciana
artículos
Título:
Seasonal patterns in the seed bank of a grassland in north-western Patagonia
Autor/es:
GHERMANDI L.
Revista:
JOURNAL OF ARID ENVIRONMENTS
Referencias:
Año: 1997 vol. 35 p. 215 - 224
ISSN:
0140-1963
Resumen:
The qualitative and quantitative composition of a seed bank in a semi-arid
grassland of Stipa speciosa Trinius et Rupecht in north-western Patagonia
(Argentina) was studied. The total number of seeds was compared in late
summer, winter and spring, both inside and outside a fenced area. Each time
the same three species contributed most seed to the bank: Erophila verna L.,
with a persistent bank of type III, Rumex acetosella L., with a persistent bank
of type IV, and Vulpia australis (Nees) Blom, with a transient bank of type I.
The native and dominant species, Stipa speciosa, was among the rarest species
in the bank. The highest total number of seeds was found in March (early
autumn). A greater number of seeds was found inside than outside the fenced
area in the two first sampling months, March and August, whereas no
significant difference could be observed in December.Stipa speciosa Trinius et Rupecht in north-western Patagonia
(Argentina) was studied. The total number of seeds was compared in late
summer, winter and spring, both inside and outside a fenced area. Each time
the same three species contributed most seed to the bank: Erophila verna L.,
with a persistent bank of type III, Rumex acetosella L., with a persistent bank
of type IV, and Vulpia australis (Nees) Blom, with a transient bank of type I.
The native and dominant species, Stipa speciosa, was among the rarest species
in the bank. The highest total number of seeds was found in March (early
autumn). A greater number of seeds was found inside than outside the fenced
area in the two first sampling months, March and August, whereas no
significant difference could be observed in December.Erophila verna L.,
with a persistent bank of type III, Rumex acetosella L., with a persistent bank
of type IV, and Vulpia australis (Nees) Blom, with a transient bank of type I.
The native and dominant species, Stipa speciosa, was among the rarest species
in the bank. The highest total number of seeds was found in March (early
autumn). A greater number of seeds was found inside than outside the fenced
area in the two first sampling months, March and August, whereas no
significant difference could be observed in December.Rumex acetosella L., with a persistent bank
of type IV, and Vulpia australis (Nees) Blom, with a transient bank of type I.
The native and dominant species, Stipa speciosa, was among the rarest species
in the bank. The highest total number of seeds was found in March (early
autumn). A greater number of seeds was found inside than outside the fenced
area in the two first sampling months, March and August, whereas no
significant difference could be observed in December.Vulpia australis (Nees) Blom, with a transient bank of type I.
The native and dominant species, Stipa speciosa, was among the rarest species
in the bank. The highest total number of seeds was found in March (early
autumn). A greater number of seeds was found inside than outside the fenced
area in the two first sampling months, March and August, whereas no
significant difference could be observed in December.Stipa speciosa, was among the rarest species
in the bank. The highest total number of seeds was found in March (early
autumn). A greater number of seeds was found inside than outside the fenced
area in the two first sampling months, March and August, whereas no
significant difference could be observed in December.