Effects of pasturing cattle on the regeneration of three commercial tree species of the Argentine Chaco: a method of protection

Simon, M.; Ibrahim, M.; Finegan, B.; Pezo, D.

Agroforesteria en las Americas 5(17/18): 64-67


Accession: 003120086

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Changes in the herbaceous biomass of, and damage to, 3 timber species (Schinopsis balansae, Prosopis nigra and Geoffroea decorticans) when grazing was begun with different levels of forage availability, was studied in the Santa Fe Forest Triangle of the Argentine Chaco. Two treatments were evaluated with 3 replications: cut pasture (control) and accumulated pasture. Both treatments were grazed at an animal intensity of 3.125 AU (1 AU = 400 kg liveweight). Availability herbaceous biomass decreased from 3-5 t/ha (dry weight) at the beginning of the grazing period to 0-1.2 t/ha after 30 days of grazing. The percentage of damaged trees was lower in the accumulated pasture treatment (48 vs. 65%). Significant differences were observed among tree species and grazing times. G. decorticans and P. nigra had a smaller percentage of damaged plants than S. balansae, with means of 45, 65 and 86% for cut pasture and 43, 45 and 76% for the accumulated pasture, respectively. It is concluded that forage availability affects the level of damage which cattle grazing causes to regeneration of S. balansae, P. nigra and G. decorticans. These species differ in palatability with that of S. balansae > P. nigra > G. decorticans.