Controls of Carrying Capacity: Degradation, Primary Production, and Forage Quality Effects in a Patagonian Steppe

Abstract

Rangeland carrying capacity depends on aboveground net primary production (ANPP) and on the sustainable 19harvest index (HIsust), the portion of ANPP that livestock can consume without undermining the production 20capacity of the system. At a regional scale, the observed harvest index (HIreal) increases with ANPP, but at a 21landscape scale the pattern is less clear, and controls of HIreal and HIsust are unknown. We analyzed the 22landscape patterns of variation of HIreal and HIsust across gradients of ANPP, pastoral value of vegetation (PV), 23and degradation. In 15 plots of a 2 753-ha paddock in a western Patagonian grass?shrub steppe, we estimated 24ANPP, consumption, forage pastoral value, and degradation. To estimate degradation we used PV weighed by 25forage cover because it was negatively correlated with a combination of ecosystem traits formerly linked to 26grazing-induced degradation. We calculated HIreal (consumption/ANPP) and HIsust (consumption removing 2740% of aerial biomass of the key species/ANPP). We choose Festuca pallescens as the key species because of its 28high abundance and moderate preference. As the paddock was grazed with low stocking rate to maximize 29among-plots selection, HIreal was lower than HIsust. As in regional models, HIsust and HIreal increased with 30ANPP within the paddock (R 31 2 = 0.33 and 0.30, respectively). Multiple regressions showed that HIreal increasedwith ANPP and degradation, while HIsust increased with ANPP but decreased with degradation (R 32 2 = 0.64 and0.77, respectively). This suggests that at stocking rates lower than carrying capacity, sheep choose highly produc- 33tive stands and, at a given level of ANPP, they prefer degraded stands. In contrast, carrying capacity increases with 34productivity and decreases with degradation. Management systems based on HIsust may result in severe 3536 biomass removal of species more preferred than the key species (Poa ligularis), and it is necessary to include37 strategies to preserve their individuals and populations.