Fecha/hora: 03/06/2024 04:10:22

Biblioteca(s): | INIA Las Brujas.
Fecha corriente: | 05/04/2021
Fecha de la última actualización: | 05/04/2021
Autoria: | ALTESOR, A.; PIÑEIRO, G.; LEZAMA, F.; JACKSON, R.B; SARASOLA, M.; PARUELO, J.
Afiliación: | ALICE ALTESOR, Departamento de Ecología, Facultad de Ciencias, Universidad de la Repúbica, Montevideo, Uruguay; G. PIÑEIRO, Laboratorio de Análisis Regional Y Teledetección, IFEVA-Cátedra de Ecología, Universidad de Buenos Aires Y CONICET, Buenos Aires, Argentina; F. LEZAMA, Departamento de Ecología, Facultad de Ciencias, Universidad de la Repúbica, Montevideo, Uruguay; R.B. JACKSON, Laboratorio de Análisis Regional y Teledetección, IFEVA-Cátedra de Ecología, Facultad de Agronomía, Universidad de Buenos Aires y CONICET, Buenos Aires, Argentina; M. SARASOLA, Departamento de Ecología, Facultad de Ciencias, Universidad de la Repúbica, Montevideo, Uruguay; JOSÉ PARUELO, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay.
Título: | Ecosystem changes associated with grazing in subhumid South American grasslands.
Año de publicación: | 2006
Fuente/Imprenta: | Journal of Vegetation Science, June 2006, Volume 17, Issue 3, Pages 323-332. Doi: https://doi.org/10.1111/j.1654-1103.2006.tb02452.x
ISSN: | 1100-9233
DOI: | 10.1111/j.1654-1103.2006.tb02452.x
Idioma: | Inglés
Notas: | Article history: Received 20 September 2005; Accepted 16 January 2006; Issue Online 24 February 2006; Version of Record online 24 February 2006.

Contenido:

ABSTRACT.
Question: What are the changes in vegetation structure, soil attributes and mesofauna associated with grazing in mesic grasslands? Location: Southern Campos of the Rio de la Plata grasslands, in south-central Uruguay. Methods: We surveyed seven continuously grazed and ungrazed paired plots. Plant and litter cover were recorded on three 5-m interception lines placed parallel to the fence in each plot. We extracted soil fauna from a 10 cm deep composite sample and analysed the oribatids. Soil attributes included bulk density, water content, organic carbon (in particulate and mineral associated organic matter) and nitrogen content and root biomass at different depths. Changes in floristic, Plant Functional Types and mesofauna composition were analysed by Non-metric Multidimensional Scaling. Results: Species number was lower in ungrazed than in grazed plots. Of 105 species in grazed plots only three were exotics. Shrub and litter cover were significantly higher inside the exclosures, while the cover of Cyperaceae-Juncaceae was lower. Grazing treatments differed significantly in plant and oribatid species composition. Grazing exclusion significantly reduced soil bulk density and increased soil water content. Carbon content in particulate organic matter was lower in the upper soil of ungrazed sites, but deeper in the profile, grazing exclosures had 8% more carbon in the mineral associated organic matter. Conclusions: Our results generally agree with previous studies but deviate from the results of previous analyses in (1) the increase of shrub cover in ungrazed sites; (2) the redistribution of the soil organic carbon in the profile and (3) the low invasibility of the prairies regardless of grazing regime. 
© IAVS; Opulus Press.

Palabras-Clave: | Oribatide; Plant Functional Type; Soil attribute; Species richness.
Thesagro: | ECOSISTEMAS; URUGUAY.
Categoría del tema: | P01 Conservación de la naturaleza y recursos de La tierra
Registro original: | INIA Las Brujas (LB)
Ejemplares: | LB - (102626-1) - ADD - AP - DD - RBI LB -  -  - DIS