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Natural grasslands cover important extensions in different latitudes of the world, especially in arid and semiarid regions. The importance of these ecosystems is the use to which they are intended, which is livestock production. In the central semiarid region of Argentina, common vegetation types are natural grasslands (low and sandy grasslands), Prosopis woodlands and shrublands. Cattle grazing is one of the main factors causing floristic and structural changes in this region, where there are many grass species that are able to withstand this grazing pressure. Prior results show differences in plant structure when plants from grazed and non-grazed areas were compared. The hypothesis of this work was that forage species that persist today are acclimated to the action of herbivores, and are able to withstand grazing by producing tillers from increasingly buried crowns. Crown diameter and burial depth of forage species (Poa ligularis, Piptochaetium napostaense, Digitaria californica and Bothriochloa springfieldii) and non forage species (Jarava ichu, Amelichloa brachychaeta and Nassella tenuissima) were evaluated under grazing and non grazing conditions. The work was conducted in the region of hills and ridges of the Province of La Pampa where transects were established in grazed and non grazed areas. For all areas under grazing, livestock pressure was determined on the basis of time of grazing and stocking rate. Results show that crowns of forage plant species were buried deeper in grazed areas than in enclosures, whereas crown burial depth of non-forage species present no differences between grazing and non grazing sites. These results may indicate that forage species in grasslands of the semiarid central region of Argentina growing under grazing pressure tend to favor deeper buds development thus contributing to the protection of grazing basal growth points against adverse environmental conditions.

Posición de las coronas como mecanismo para tolerar el pastoreo en especies forrajeras del pastizal bajo en la región semiárida central de Argentina