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Artículo

Plant production along a grazing gradient in a semiarid Patagonian rangeland, Argentina

Campanella, María VictoriaIcon ; Bisigato, Alejandro JorgeIcon ; Rostagno, Cesar MarioIcon
Fecha de publicación: 12/2016
Editorial: Springer
Revista: Plant Ecology
ISSN: 1385-0237
e-ISSN: 1573-5052
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ciencias Biológicas

Resumen

Patagonian rangelands have been grazed by sheep since early twentieth century. However, there is still a degree of uncertainty regarding how production of grass and shrub species changes along a grazing gradient. The study was undertaken in Northeastern Patagonia, Argentina. The characteristic vegetation in the area is a mosaic of herbaceous steppe with shrubs (HSS) and shrub steppe (SS). Grazing intensity was estimated through sheep paths density. Individual plant production and plant density were used to determine grass and shrub production per unit area, in both plant communities over three years. Community production was obtained as the sum of grass and shrub components. Differences were explored in shrub and grass production among communities and years, and linear regressions between sheep paths density and the proportion of each plant community along the transect were performed. Mean community production was lower in SS than HSS; shrubs did not compensate for the decline in grass production in spite of the increase in shrub density. SS presented the highest community production in the most humid year, while HSS production peaks in the year of average precipitation. We found that as the number of sheep paths increases (i.e., higher grazing intensities), the SS community replaces HSS, resulting in a reduction of forage for sheep. The results showed that changes in vegetation structure as a result of grazing strongly influenced above-ground production. Results also indicate that the response of vegetation to changes in annual precipitation is community specific.
Palabras clave: Grass Production , Inter-Annual Precipitation , Shrub Encroachment , Shrub Production
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/61534
DOI: http://dx.doi.org/10.1007/s11258-016-0668-8
URL: https://link.springer.com/article/10.1007%2Fs11258-016-0668-8
Colecciones
Articulos(IPEEC)
Articulos de INSTITUTO PATAGONICO PARA EL ESTUDIO DE LOS ECOSISTEMAS CONTINENTALES
Citación
Campanella, María Victoria; Bisigato, Alejandro Jorge; Rostagno, Cesar Mario; Plant production along a grazing gradient in a semiarid Patagonian rangeland, Argentina; Springer; Plant Ecology; 217; 12; 12-2016; 1553-1562
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