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dc.contributor.authorGolluscio, R. A.
dc.contributor.authorBottaro, H. S.
dc.contributor.authorOesterheld, M.
dc.date.accessioned2021-03-08T18:37:43Z
dc.date.available2021-03-08T18:37:43Z
dc.date.issued2015-05
dc.identifier.citationGolluscio, R. A., Bottaro, H. S., & Oesterheld, M. (2015). Controls of Carrying Capacity: Degradation, Primary Production, and Forage Quality Effects in a Patagonian Steppe. Rangeland Ecology & Management, 68(3), 266–275.
dc.identifier.issn0022-409x
dc.identifier.doi10.1016/j.rama.2015.03.002
dc.identifier.urihttp://hdl.handle.net/10150/656925
dc.description.abstractRangeland carrying capacity depends on aboveground net primary production (ANPP) and on the sustainable harvest index (HIsust), the portion of ANPP that livestock can consume without undermining the production capacity of the system. At a regional scale, the observed harvest index (HIreal) increases with ANPP, but at a landscape scale the pattern is less clear, and controls of HIreal and HIsust are unknown. We analyzed the landscape patterns of variation of HIreal and HIsust across gradients of ANPP, pastoral value of vegetation (PV), and degradation. In 15 plots of a 2 753-ha paddock in a western Patagonian grass-shrub steppe, we estimated ANPP, consumption, forage pastoral value, and degradation. To estimate degradation we used PV weighed by forage cover because it was negatively correlated with a combination of ecosystem traits formerly linked to grazing-induced degradation. We calculated HIreal (consumption/ ANPP) and HIsust (consumption removing 40% of aerial biomass of the key species/ANPP). We choose Festuca pallescens as the key species because of its high abundance and moderate preference. As the paddock was grazed with low stocking rate to maximize among-plots selection, HIreal was lower than HIsust. As in regional models, HIsust and HIreal increased with ANPP within the paddock (R2 = 0.33 and 0.30, respectively). Multiple regressions showed that HIreal increased with ANPP and degradation, while HIsust increased with ANPP but decreased with degradation (R2 = 0.64 and 0.77, respectively). This suggests that at stocking rates lower than carrying capacity, sheep choose highly productive stands and, at a given level of ANPP, they prefer degraded stands. In contrast, carrying capacity increases with productivity and decreases with degradation. Management systems based on HIsust may result in severe biomass removal of species more preferred than the key species (Poa ligularis), and it is necessary to include strategies to preserve their individuals and populations. © 2015 Society for Range Management. Published by Elsevier Inc. All rights reserved.
dc.language.isoen
dc.publisherSociety for Range Management
dc.relation.urlhttps://rangelands.org/
dc.rightsCopyright © Society for Range Management.
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectgrazing
dc.subjectharvest index
dc.subjectrange management
dc.subjectsustainability
dc.titleControls of Carrying Capacity: Degradation, Primary Production, and Forage Quality Effects in a Patagonian Steppe
dc.typeArticle
dc.typetext
dc.identifier.journalRangeland Ecology & Management
dc.description.collectioninformationThe Rangeland Ecology & Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.source.journaltitleRangeland Ecology & Management
dc.source.volume68
dc.source.issue3
dc.source.beginpage266
dc.source.endpage275
refterms.dateFOA2021-03-08T18:37:43Z


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