Grasses and grazers in arid rangelands impact of sheep management on forage and non - forage grass populations

Ecological modeling that includes plant population processes as a critical determinant of vegetation dynamics is useful for sustainable rangeland management. However, we know little about how long - term sheep grazing pressure drives the plant community structure through changes in different native...

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Detalles Bibliográficos
Autor principal: Oñatibia, Gastón R.
Otros Autores: Aguiar, Martín Roberto
Formato: Artículo
Lenguaje:Inglés
Materias:
FORAGE PROVISION
GRAZING-REST
LIVESTOCK
PATAGONIA
POPULATION APPROACH
RANGELAND MANAGEMENT
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2019onatibia.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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024 |a 10.1016/j.jenvman.2019.01.037 
040 |a AR-BaUFA  |c AR-BaUFA 
100 1 0 |9 33451  |a Oñatibia, Gastón R.  |u Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.  |u CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.  |u Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Recursos Naturales y Ambiente. Buenos Aires, Argentina. 
245 0 0 |a Grasses and grazers in arid rangelands  |b impact of sheep management on forage and non - forage grass populations 
520 |a Ecological modeling that includes plant population processes as a critical determinant of vegetation dynamics is useful for sustainable rangeland management. However, we know little about how long - term sheep grazing pressure drives the plant community structure through changes in different native grass species at both individual and population levels. In this study, we hypothesized that plant populations perform differently under different grazing management due to their specified preference by livestock animals. We also tested whether grazing - rest management, aimed at increasing long - term rangeland sustainability, improves the plant growth of forage grass species. We evaluated plant density, individual morphology and plant - size distribution of dominant grass populations in permanent exclosures and open fields under moderate and intensive grazing pressures in Patagonian steppes (South America). We also examined the effects of seasonal grazing - rest managements on the growth and tillering (asexual reproduction) of forage species plants, using temporary mobile exclosures. Grazing intensity changed population density and structure according to species. Compared to permanent exclosures, moderate grazing maintained the plant density of palatable species highly preferred by sheep, reduced the standing - dead biomass proportion of individual plants, and promoted the green biomass of tussocks. Conversely, intensive grazing (double stocking rates) decreased the plant density and individual size of species highly preferred by sheep, and increased the plant density of non - preferred species. Grazing - rest enhanced forage grass species growth and reproduction compared with year - round grazing management, especially during the growing season of a wet year. Our studies support that sheep can be managed to control the plant - size distribution of dominant grass species, their population dynamics, and thereby the overall forage availability at the community level. Both moderate grazing and grazing - rest management can improve the forage availability and preserve the dominant native grasses. We suggest applying a plant population dynamics perspective to facilitate sustainable management of global rangelands. 
653 |a FORAGE PROVISION 
653 |a GRAZING-REST 
653 |a LIVESTOCK 
653 |a PATAGONIA 
653 |a POPULATION APPROACH 
653 |a RANGELAND MANAGEMENT 
700 1 0 |9 12939  |a Aguiar, Martín Roberto  |u Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.  |u CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.  |u Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Recursos Naturales y Ambiente. Buenos Aires, Argentina. 
773 |t Journal of Environmental Management  |g vol.235 (2019), p.42-50, grafs, tbls. 
856 |f 2019onatibia  |i En Reservorio  |q application/pdf  |u http://ri.agro.uba.ar/files/intranet/articulo/2019onatibia.pdf  |x ARTI201904 
856 |u https://www.elsevier.com  |z LINK AL EDITOR 
942 |c ARTICULO 
942 |c ENLINEA 
976 |a AAG 

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