Harvest methods used to estimate plant biomass can be replaced by non-destructive methods, which are cost effective and allow for multiple estimates of biomass in the same location ([Catchpole and Catchpole, 1993] and [Sala and Austin, 2000]). Flombaum and Sala (2007) developed a method based on a model relating plant cover and aboveground biomass of dominant grass species of the Patagonian steppe. The study enlarged the range of cover and biomass by removing portions of individual tussock grasses and obtained significant relationships between cover and biomass data for all categories (Flombaum and Sala, 2007). Mont�s (2009) pointed out that reducing the area of a tuft could lead to an overestimation of the relationship between grass [...]
