Restoration by recolonization of native species seeding in semiarid rangelands of Patagonia

  • Daniela Ferrante Instituto Nacional de Tecnología Agropecuario; Universidad Nacional de la Patagonia Austral. https://orcid.org/0000-0002-6056-3839
  • Javier Álvarez Bento Ea. Punta Loyola
  • María Eugenia Vivar Miranda Instituto Nacional de Tecnología Agropecuaria
  • Gabriel Esteban Oliva Instituto Nacional de Tecnología Agropecuario; Universidad Nacional de la Patagonia Austral. https://orcid.org/0000-0002-7839-8851
  • Victor Ricardo Utrilla Instituto Nacional de Tecnología Agropecuario; Universidad Nacional de la Patagonia Austral.

DOI:

https://doi.org/10.19137/semiarida.2023(01).17-27

Keywords:

secondary succession, disturbance, seeding, Agropyron sp, biodiversity

Abstract

A. In the Magellan Steppe of south Patagonia, degradation of Festuca grasslands leads to dwarf shrub steppes in an irreversible way, but a secondary succession following a disturbance such as plowing and seeding may aid the restoration. We studied degraded Festuca gracillima grasslands (Fg site) and Lepidophyllum cupressiforme shrublands in salty nitric soils (MV
site) that had been plowed, seeded, and seasonally grazed thereafter with sheep. The pastures (100-
500 ha) were: recent (1 year in Fg and 7 yrs in Mv), intermediate (11 yrs), and old (16 yrs). Vegetation
was assessed using 3 500-point transects in each pasture and 0-20 cm soil samples were obtained
and analyzed in a laboratory. A Canonical Correspondence analysis using soil and vegetation
properties arranged transects of the Fg site according to age since sowing, but this did not happen in
Mv. In Fg introduced Agropyron sp. and Dactylis glomerata dominated initially but grasses and native
forbs were recruited subsequently (Poa spiciformis, Deschampsia patula and Carex andina) and finally
some psamophyle grasses were incorporated (Pappostipa chrysophylla and Pappostipa ibarii). Cover
and diversity were partially recovered in this relatively short time, showing that these semiarid
rangelands retain resilience and restoration potential after a disturbance

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Patagonia Argentina (Imagen: Ferrante, Daniela)

Published

2023-08-14

Issue

Section

Artículos Científicos y Técnicos