Grass recruitment constraints along a grazing gradient in Patagonia: N-limitation x adult competition trade-off
We explored the effect of N addition and adult canopy competition on the recruitment of lost preferred species in the Patagonian steppe, where a decelerated N cycling scenario (sensu Ritchie et al., 1998) had been previously detected. In the first experiment we demonstrated that the preferred scarce...
| Autores principales: | , |
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| Formato: | Artículo |
| Lenguaje: | Inglés |
| Publicado: |
Elsevier
2021
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| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12123/8903 https://www.sciencedirect.com/science/article/pii/S014019632100046X https://doi.org/10.1016/j.jaridenv.2021.104480 |
| _version_ | 1855484288392232960 |
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| author | Garcia Martinez, Guillermo Carlos Golluscio, Rodolfo Angel |
| author_browse | Garcia Martinez, Guillermo Carlos Golluscio, Rodolfo Angel |
| author_facet | Garcia Martinez, Guillermo Carlos Golluscio, Rodolfo Angel |
| author_sort | Garcia Martinez, Guillermo Carlos |
| collection | INTA Digital |
| description | We explored the effect of N addition and adult canopy competition on the recruitment of lost preferred species in the Patagonian steppe, where a decelerated N cycling scenario (sensu Ritchie et al., 1998) had been previously detected. In the first experiment we demonstrated that the preferred scarce grass Bromus pictus has typical traits of Competitive species, while the dominant less preferred Pappostipa speciosa has typical traits of Stress tolerant species (sensu Grime, 1997): B. pictus showed higher maximum Relative Growth Rate, water consumption and competitive ability than P. speciosa. In the second experiment, we proved that without N addition, seedlings of the preferred species showed its maximum survival rate under moderate grazing, where adult competition is lower than under ungrazed conditions and N-limitation is lower than under intense grazing. Instead, with N addition, the survival rate of B. pictus was maximum under intense grazing, where N limitation is maximum and adult competition is minimum. These results suggest that in degraded systems subjected to a decelerating N cycling scenario, the revegetation with preferred species would require recovering soil N levels, and would be more successful in the most degraded sites, where the remnant canopy has low cover. |
| format | Artículo |
| id | INTA8903 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | Elsevier |
| publisherStr | Elsevier |
| record_format | dspace |
| spelling | INTA89032021-03-16T14:48:31Z Grass recruitment constraints along a grazing gradient in Patagonia: N-limitation x adult competition trade-off Garcia Martinez, Guillermo Carlos Golluscio, Rodolfo Angel Desertificación Restauración Nitrógeno Plantas para Recuperación del Suelo Pastoreo Desertification Restoration Nitrogen Soil Reclamation Plants Grazing Región Patagónica We explored the effect of N addition and adult canopy competition on the recruitment of lost preferred species in the Patagonian steppe, where a decelerated N cycling scenario (sensu Ritchie et al., 1998) had been previously detected. In the first experiment we demonstrated that the preferred scarce grass Bromus pictus has typical traits of Competitive species, while the dominant less preferred Pappostipa speciosa has typical traits of Stress tolerant species (sensu Grime, 1997): B. pictus showed higher maximum Relative Growth Rate, water consumption and competitive ability than P. speciosa. In the second experiment, we proved that without N addition, seedlings of the preferred species showed its maximum survival rate under moderate grazing, where adult competition is lower than under ungrazed conditions and N-limitation is lower than under intense grazing. Instead, with N addition, the survival rate of B. pictus was maximum under intense grazing, where N limitation is maximum and adult competition is minimum. These results suggest that in degraded systems subjected to a decelerating N cycling scenario, the revegetation with preferred species would require recovering soil N levels, and would be more successful in the most degraded sites, where the remnant canopy has low cover. EEA Esquel Fil: García Martínez, Guillermo Carlos. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agroforestal Esquel; Argentina Fil: Golluscio, Rodolfo. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Forrajicultura; Argentina Fil: Golluscio, Rodolfo. Universidad de Buenos Aires. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina 2021-03-16T14:36:35Z 2021-03-16T14:36:35Z 2021-03-09 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/8903 https://www.sciencedirect.com/science/article/pii/S014019632100046X 0140-1963 https://doi.org/10.1016/j.jaridenv.2021.104480 eng info:eu-repo/semantics/restrictedAccess application/pdf Elsevier Journal of Arid Environments 189 : 104480 (2021) |
| spellingShingle | Desertificación Restauración Nitrógeno Plantas para Recuperación del Suelo Pastoreo Desertification Restoration Nitrogen Soil Reclamation Plants Grazing Región Patagónica Garcia Martinez, Guillermo Carlos Golluscio, Rodolfo Angel Grass recruitment constraints along a grazing gradient in Patagonia: N-limitation x adult competition trade-off |
| title | Grass recruitment constraints along a grazing gradient in Patagonia: N-limitation x adult competition trade-off |
| title_full | Grass recruitment constraints along a grazing gradient in Patagonia: N-limitation x adult competition trade-off |
| title_fullStr | Grass recruitment constraints along a grazing gradient in Patagonia: N-limitation x adult competition trade-off |
| title_full_unstemmed | Grass recruitment constraints along a grazing gradient in Patagonia: N-limitation x adult competition trade-off |
| title_short | Grass recruitment constraints along a grazing gradient in Patagonia: N-limitation x adult competition trade-off |
| title_sort | grass recruitment constraints along a grazing gradient in patagonia n limitation x adult competition trade off |
| topic | Desertificación Restauración Nitrógeno Plantas para Recuperación del Suelo Pastoreo Desertification Restoration Nitrogen Soil Reclamation Plants Grazing Región Patagónica |
| url | http://hdl.handle.net/20.500.12123/8903 https://www.sciencedirect.com/science/article/pii/S014019632100046X https://doi.org/10.1016/j.jaridenv.2021.104480 |
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