Influencia de la introducción de Eragrostis lehmanniana sobre la comunidad de gramíneas en la Reserva de Ñacuñán (Mendoza, Argentina)
E. lehmanniana Nees was seeded in Ñacuñán Reserve in 1976. The linear rate of spread, the abundance of this exotic grass and the impact of its introduction on the native perennial grass community were evaluated after 24 years seeding. Sites dominated by the exotic grass and those including onl...
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| Publicado en: | Revista de la Facultad de Ciencias Agrarias |
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| Autores principales: | , , |
| Materias: | |
| Acceso en línea: | https://bdigital.uncu.edu.ar/fichas.php?idobjeto=1519 |
| Sumario: | E. lehmanniana Nees was seeded in
Ñacuñán Reserve in 1976. The linear rate of
spread, the abundance of this exotic grass and
the impact of its introduction on the native
perennial grass community were evaluated
after 24 years seeding. Sites dominated by
the exotic grass and those including only
native vegetation were compared. The Mann-
Whitney test was applied to compare grass
canopy cover, number of species per plot and
abundance of the exotic grass between the
mentioned sites. The exotic grass spread
32 m year-1. It was present in tracks where the
native woody vegetation had been removed,
and in 45 % of the sites located in undisturbed
areas adjacent to tracks. The total native grass
canopy cover was significantly reduced in the
sites where lovegrass was present. The
number of total grass species per plot was not
affected by the presence of the exotic grass.
Pappophprum caespitosum, the dominant
grass in Ñacuñán, and Sporobolus cryptandrus
presented lower canopy cover in the
sites dominated by the exotic species than that
in the undisturbed ones. The introduction of
E. lehmanniana has had a negative impact
on the composition of the native perennial
grass community in the disturbed sites of
the Reserve.
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