Abstract
Panicum prionitis (“paja de techar”) tall grasslands are one of the most extensive vegetation types in the islands of the Parana River valley. These communities are traditionally burned in order to improve its quality forage and animal consumption. Our objective was to analyze the effect of different disturbances along two years: prescribed fire, mowing and control using multivariate analyses on vegetation variables (abundance-cover, richness, evenness and diversity). P. prionitis remained as dominant species regardless of treatment and throughout the experiment. Even though disturbances affected species composition, no significant effect was detected on richness, evenness, and diversity. Mowing and the use of prescribed fire showed the same effect on this highly resilient community.
Highlights
Resilience of a Panicum prionitis Nees tall grassland under different management alternatives
Panicum prionitis (“paja de techar”) tall grasslands are one of the most extensive vegetation types in the islands of the Parana River valley. These communities are traditionally burned in order to improve its quality forage and animal consumption
Our objective was to analyze the effect of different disturbances along two years: prescribed fire, mowing and control using multivariate analyses on vegetation variables
Summary
Resiliencia de un pajonal de Panicum prionitis Nees bajo distintas alternativas de manejo. Los “pajonales” de Panicum prionitis (“paja de techar”) son una de las comunidades de mayor extensión en las islas y el valle de inundación del río Paraná. El objetivo de este trabajo fue comparar los efectos de la quema y del corte del pajonal de P. prionitis sobre la vegetación (abundancia-cobertura, riqueza, equitatividad y diversidad). Para ello se condujo un experimento con distintos tratamientos: quema, corte (simulando una labor de desmalezado mecánico) y testigo sin disturbar, y se realizaron censos de vegetación durante dos años post-disturbio. Aunque los disturbios alteraron la composición específica, aumentando la riqueza, la equitatividad y la diversidad con respecto al testigo, las diferencias desaparecieron luego de un año de haber aplicado los tratamientos. El corte tuvo el mismo efecto que el fuego, lo cual evidencia una gran resiliencia por parte de la comunidad en estudio
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