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In Santa Cruz province, nearly 2.83 million hectares are occupied by a shrub steppe dominated by Mulguraea tridens (locally called matorral de mata negra), where the main activity is extensive sheep farming. This paper focuses on the effects of management practices such as removal in strips of the above ground shrub layer. The treatments were the control and the cutting of 4 and 8 m wide strips. Meteorological variables (humidity, rainfall, temperature and wind), the effect of treatments on soil variables, shrub regrowth capacity and aspects related to soil seed bank (SSB), potential germination and seedling recruitment in the field were monitored for a term of three years. The vegetation cover and grassland productivity was assessed after one, three and five years of treatments application. Shrub litter from cutting strip treatments varied between 5700 and 8000 kg/ha of dry matter, resulting in a decrease in soil range temperature (2-5 °C) and an increase in soil moisture (2.5-7.5%) during spring-summer months. Short grasses and herb productivity in the control was 11.6 kg/ha of dry matter and under strips management was up to 88.2 kg/ha of dry matter in the fifth year possibly due to better soil water use rather than seedling establishment. No significant effect of treatments on the SSB was observed. Shrubs showed ability to resprout, which provide flexibility in long term management allowing a rotational scheme of strips.

Respuesta de la vegetación al manejo por corte en fajas en un arbustal de Mulguraea tridens en Patagonia sur