Populousness changes of a Pampas Silvopastoral System (Argentina) as a function of tree canopy
AbstractThe aim of this research was to assess the effects of total and partial clearing and alternate grazing on succession changes of a Silvopastoral System. The experimental area is located in the State of Buenos Aires, Argentina (34º 52' LS; 58º 08' LW). At the initial time the vegetation tree appeared to be predominantly Honeylocust (Gleditsia triacanthos L.), which represented 90 p. 100 of cover. The native vegetation mainly composed by rescue grass (Bromus catharticus Vahl.) and Italian ryegrass (Lolium multiflorum Lam.), represented 4,5 p. 100 of the basal cover. During ten years, from 1985 till 1994, data were collected to describe differences between cleared and woodland areas. The treatments were subjected to a continous and noncontinous horse grazing (with distubance and resting events). Our results suggest that partial clearing and alternate grazing does not alter tree density. Furthermore, this treatment may result in a greater (p < 0.05) forage cover (23 p. 100), species diversity (2.5) and a higher nutritive value and forage biomass production (2,020 kg of dry matter/ha-1).
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