Grasses have larger response than shrubs to increased nitrogen availability a fertilization experiment in the Patagonian steppe
Nitrogen limits plant growth in almost all terrestrial ecosystems, even in low-precipitation ecosystems. Vegetation in arid ecosystems is usually composed of two dominant plant-functional types, grasses and shrubs, which have different rooting and water acquisition patterns. These plant-functional t...
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| Otros Autores: | , |
| Formato: | Artículo |
| Lenguaje: | Español |
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| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2014yahdjian.pdf LINK AL EDITOR |
| Aporte de: | Registro referencial: Solicitar el recurso aquí |
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| 022 | |a 0140-1963 | ||
| 024 | |a 10.1016/j.jaridenv.2013.11.002 | ||
| 040 | |a AR-BaUFA | ||
| 100 | 1 | |9 16176 |a Yahdjian, María Laura | |
| 245 | 0 | 0 | |a Grasses have larger response than shrubs to increased nitrogen availability |b a fertilization experiment in the Patagonian steppe |
| 520 | |a Nitrogen limits plant growth in almost all terrestrial ecosystems, even in low-precipitation ecosystems. Vegetation in arid ecosystems is usually composed of two dominant plant-functional types, grasses and shrubs, which have different rooting and water acquisition patterns. These plant-functional types may respond differently to N availability because they have different strategies to absorb and retranslocate N. We hypothesized that grasses are more N limited than shrubs, and consequently will show higher responses to N addition. To test this hypothesis, we added 50kgNha-1year-1 as NH4NO3 during two years in the Patagonian steppe, Argentina, and we evaluated the responses of aboveground net primary production and N concentration of green leaves of the dominant grass and shrub species. Grass biomass significantly [P=0.007] increased with increased N availability whereas shrub biomass did not change after two years of N addition. Shrubs have higher nitrogen concentration in green leaves than grasses, particularly the leguminous Adesmia volkman n i, and showed no response to N addition whereas foliar N concentration of grasses significantly increased with N fertilization [P less than 0.05]. Grasses may have a larger response to increase N availability than shrubs because they have a more open N economy absorbing up to 30 percent of their annual requirement from the soil. In contrast, shrubs have a closer N cycle, absorbing between 7 and 16 percent of their annual N requirement from the soil. Consequently shrubs depend less on soil N availability and are less responsive to increases in soil N. | ||
| 653 | 0 | |a ADESMIA | |
| 653 | 0 | |a ANNUAL VARIATION | |
| 653 | 0 | |a ARID ECOSYSTEMS | |
| 653 | 0 | |a CONCENTRATION [COMPOSITION] | |
| 653 | 0 | |a FERTILIZATION [REPRODUCTION] | |
| 653 | 0 | |a FOLIAR NITROGEN | |
| 653 | 0 | |a GRASS | |
| 653 | 0 | |a GROWTH RATE | |
| 653 | 0 | |a GROWTH RESPONSE | |
| 653 | 0 | |a NITROGEN | |
| 653 | 0 | |a NITROGEN FERTILIZATION | |
| 653 | 0 | |a NUTRIENT AVAILABILITY | |
| 653 | 0 | |a PATAGONIA | |
| 653 | 0 | |a PLANT FUNCTIONAL TYPES | |
| 653 | 0 | |a POACEAE | |
| 653 | 0 | |a PRIMARY PRODUCTION | |
| 653 | 0 | |a SHRUB | |
| 653 | 0 | |a SOIL NUTRIENT | |
| 653 | 0 | |a STEPPE | |
| 653 | 0 | |a WATER USE | |
| 700 | 1 | |a Gherardi Arbizu, Laureano |9 22726 | |
| 700 | 1 | |9 21158 |a Sala, Osvaldo Esteban | |
| 773 | |t Journal of Arid Environments |g vol.102 (2014), p.17-20 | ||
| 856 | |u http://ri.agro.uba.ar/files/intranet/articulo/2014yahdjian.pdf |i En reservorio |q application/pdf |f 2014yahdjian |x MIGRADOS2018 | ||
| 856 | |u http://www.elsevier.com/ |x MIGRADOS2018 |z LINK AL EDITOR | ||
| 942 | 0 | 0 | |c ARTICULO |
| 942 | 0 | 0 | |c ENLINEA |
| 976 | |a AAG | ||