Rangeland Ecology & Management

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Ecosystem changes associated with grazing intensity on the Punta Ninfas rangelands of Patagonia, Argentina
Author
Beeskow, A. M.
Ellisalde, N. O.
Rostagno, C. M.
Publisher
Society for Range Management
Publication Year
1995-11-01
Body

Changes in the vegetation and soil surface were assessed along a grazing intensity gradient on rangelands of the Punta Ninfas area in southern Argentina. Thirty-two transects were sampled in areas with different grazing intensity. Bray-Curtis polar ordination and simple correlation were used to display changes in community composition and measure association between different community attributes. The first axis expressed the changes in species composition along a gradient of grazing intensity. The extremes of the gradient were represented by shrub and grass steppes. Shrub steppes dominated in heavily grazed areas close to permanent water points, while grass steppes dominated in lightly grazed areas in the extremes of the paddocks. A significant negative relation (r = -0.81, P<0.05) between grass and shrub cover suggested that grasses decreased as shrub increased. Flechilla (Stipa tenuis Phil.) and fiechilla negra [Piptochaefirrm napostaense Speg.) Hackel ap Stuckert.] were the main decreaser grasses while quilembai (Chuquiruga avellanedue Cav.) was the main shrub invading the grass steppes. Uneroded soil surface conditions decreased, and the size and frequency of crusted and desert pavement areas and mounds increased with shrub cover. Three states or stages of range degradation were identified along the gradient of grazing intensity. Grass steppe represented the most desirable state in term of livestock production and soil stability, while shrub steppe represented the most degraded and least productive state. The Journal of Range 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. Migrated from OJS platform August 2020

Language
en
Resource Type
Text
Document Type
Journal Issue/Article
Digital Object Identifier (DOI)
10.2307/4003063
Additional Information
Beeskow, A. M., Ellisalde, N. O., & Rostagno, C. M. (1995). Ecosystem changes associated with grazing intensity on the Punta Ninfas rangelands of Patagonia, Argentina. Journal of Range Management, 48(6), 517-522.
IISN
0022-409X
OAI Identifier
oai:repository.arizona.edu:10150/644232
Journal Volume
48
Journal Number
6
Journal Pages
517-522
Journal Name
Journal of Range Management
Keywords
woody weeds
indicator species
soil types
steppes
grazing intensity
shrubs
sheep
overgrazing
biomass
Argentina
botanical composition
rangelands
canopy
grasses
forage