The allocation of assimilated carbon to shoot growth: in situ assessment in natural grasslands reveals nitrogen effects and interspecific differences
In grasslands, sustained nitrogen loading would increase the proportion of assimilated carbon allocated to shoot growth (A shoot), because it would decrease allocation to roots and also encourage the contribution of species with inherently high A shoot. However, in situ measurements of carbon alloca...
| Autores principales: | , , , , , |
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| Formato: | info:ar-repo/semantics/artículo |
| Lenguaje: | Inglés |
| Publicado: |
2018
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| Materias: | |
| Acceso en línea: | https://link.springer.com/article/10.1007/s00442-013-2838-x http://hdl.handle.net/20.500.12123/2979 https://doi.org/10.1007/s00442-013-2838-x |
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| author | Xiao, Ying Gong Berone, German Dario Agnusdei, Monica Graciela Rodríguez Palma, Ricardo Manuel Schäufele, Rudi Lattanzi, Fernando Alfredo |
| author_browse | Agnusdei, Monica Graciela Berone, German Dario Lattanzi, Fernando Alfredo Rodríguez Palma, Ricardo Manuel Schäufele, Rudi Xiao, Ying Gong |
| author_facet | Xiao, Ying Gong Berone, German Dario Agnusdei, Monica Graciela Rodríguez Palma, Ricardo Manuel Schäufele, Rudi Lattanzi, Fernando Alfredo |
| author_sort | Xiao, Ying Gong |
| collection | INTA Digital |
| description | In grasslands, sustained nitrogen loading would increase the proportion of assimilated carbon allocated to shoot growth (A shoot), because it would decrease allocation to roots and also encourage the contribution of species with inherently high A shoot. However, in situ measurements of carbon allocation are scarce. Therefore, it is unclear to what extent species that coexist in grasslands actually differ in their allocation strategy or in their response to nitrogen. We used a mobile facility to perform steady-state 13C-labeling of field stands to quantify, in winter and autumn, the daily relative photosynthesis rate (RPR~tracer assimilated over one light-period) and A shoot (~tracer remaining in shoots after a 100 degree days chase period) in four individual species with contrasting morpho-physiological characteristics coexisting in a temperate grassland of Argentina, either fertilized or not with nitrogen, and either cut intermittently or grazed continuously. Plasticity in response to nitrogen was substantial in most species, as indicated by positive correlations between A shoot and shoot nitrogen concentration. There was a notable interspecific difference: productive species with higher RPR, enhanced by fertilization and characterized by faster leaf turnover rate, allocated ~20 % less of the assimilated carbon to shoot growth than species of lower productivity (and quality) characterized by longer leaf life spans and phyllochrons. These results imply that, opposite to the expected response, sustained nitrogen loading would change little the A shoot of grassland communities if increases at the species-level are offset by decreases associated with replacement of ‘low RPR-high A shoot’ species by ‘high RPR-low A shoot’ species. |
| format | info:ar-repo/semantics/artículo |
| id | INTA2979 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2018 |
| publishDateRange | 2018 |
| publishDateSort | 2018 |
| record_format | dspace |
| spelling | INTA29792018-08-06T12:27:25Z The allocation of assimilated carbon to shoot growth: in situ assessment in natural grasslands reveals nitrogen effects and interspecific differences Xiao, Ying Gong Berone, German Dario Agnusdei, Monica Graciela Rodríguez Palma, Ricardo Manuel Schäufele, Rudi Lattanzi, Fernando Alfredo Praderas Carbono Nitrógeno Brotes Crecimiento Grasslands Carbon Nitrogen Shoots Growth In grasslands, sustained nitrogen loading would increase the proportion of assimilated carbon allocated to shoot growth (A shoot), because it would decrease allocation to roots and also encourage the contribution of species with inherently high A shoot. However, in situ measurements of carbon allocation are scarce. Therefore, it is unclear to what extent species that coexist in grasslands actually differ in their allocation strategy or in their response to nitrogen. We used a mobile facility to perform steady-state 13C-labeling of field stands to quantify, in winter and autumn, the daily relative photosynthesis rate (RPR~tracer assimilated over one light-period) and A shoot (~tracer remaining in shoots after a 100 degree days chase period) in four individual species with contrasting morpho-physiological characteristics coexisting in a temperate grassland of Argentina, either fertilized or not with nitrogen, and either cut intermittently or grazed continuously. Plasticity in response to nitrogen was substantial in most species, as indicated by positive correlations between A shoot and shoot nitrogen concentration. There was a notable interspecific difference: productive species with higher RPR, enhanced by fertilization and characterized by faster leaf turnover rate, allocated ~20 % less of the assimilated carbon to shoot growth than species of lower productivity (and quality) characterized by longer leaf life spans and phyllochrons. These results imply that, opposite to the expected response, sustained nitrogen loading would change little the A shoot of grassland communities if increases at the species-level are offset by decreases associated with replacement of ‘low RPR-high A shoot’ species by ‘high RPR-low A shoot’ species. EEA Rafaela Fil: Xiao, Ying Gong. Technische Universität München. Lehrstuhl für Grünlandlehre; Alemania Fil: Berone, German Dario. Technische Universität München. Lehrstuhl für Grünlandlehre; Alemania. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Balcarce; Argentina Fil: Agnusdei, Monica Graciela. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Balcarce; Argentina Fil: Rodríguez Palma, Ricardo Manuel. Universidad de República. Facultad de Agronomía. Departamento de Producción Animal y Pasturas. Estación Experimental en Salto; Uruguay Fil: Schäufele, Rudi. Technische Universität München. Lehrstuhl für Grünlandlehre; Alemania Fil: Lattanzi, Fernando Alfredo. Technische Universität München. Lehrstuhl für Grünlandlehre; Alemania 2018-08-06T12:25:52Z 2018-08-06T12:25:52Z 2014-04 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion https://link.springer.com/article/10.1007/s00442-013-2838-x http://hdl.handle.net/20.500.12123/2979 0029-8549 1432-1939 https://doi.org/10.1007/s00442-013-2838-x eng info:eu-repo/semantics/restrictedAccess application/pdf Oecologia 174 (4) : 1085–1095 (April 2014) |
| spellingShingle | Praderas Carbono Nitrógeno Brotes Crecimiento Grasslands Carbon Nitrogen Shoots Growth Xiao, Ying Gong Berone, German Dario Agnusdei, Monica Graciela Rodríguez Palma, Ricardo Manuel Schäufele, Rudi Lattanzi, Fernando Alfredo The allocation of assimilated carbon to shoot growth: in situ assessment in natural grasslands reveals nitrogen effects and interspecific differences |
| title | The allocation of assimilated carbon to shoot growth: in situ assessment in natural grasslands reveals nitrogen effects and interspecific differences |
| title_full | The allocation of assimilated carbon to shoot growth: in situ assessment in natural grasslands reveals nitrogen effects and interspecific differences |
| title_fullStr | The allocation of assimilated carbon to shoot growth: in situ assessment in natural grasslands reveals nitrogen effects and interspecific differences |
| title_full_unstemmed | The allocation of assimilated carbon to shoot growth: in situ assessment in natural grasslands reveals nitrogen effects and interspecific differences |
| title_short | The allocation of assimilated carbon to shoot growth: in situ assessment in natural grasslands reveals nitrogen effects and interspecific differences |
| title_sort | allocation of assimilated carbon to shoot growth in situ assessment in natural grasslands reveals nitrogen effects and interspecific differences |
| topic | Praderas Carbono Nitrógeno Brotes Crecimiento Grasslands Carbon Nitrogen Shoots Growth |
| url | https://link.springer.com/article/10.1007/s00442-013-2838-x http://hdl.handle.net/20.500.12123/2979 https://doi.org/10.1007/s00442-013-2838-x |
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