dc.creator | Yahdjian, María Laura | |
dc.creator | Gherardi, Laureano | |
dc.creator | Sala, Osvaldo Esteban | |
dc.date.accessioned | 2016-02-12T18:57:55Z | |
dc.date.accessioned | 2018-11-06T14:51:13Z | |
dc.date.available | 2016-02-12T18:57:55Z | |
dc.date.available | 2018-11-06T14:51:13Z | |
dc.date.created | 2016-02-12T18:57:55Z | |
dc.date.issued | 2014-01 | |
dc.identifier | Yahdjian, María Laura; Gherardi, Laureano; Sala, Osvaldo Esteban; Grasses have larger response than shrubs to increased nitrogen availability: A fertilization experiment in the Patagonian Steppe; Elsevier; Journal of Arid Environments; 102; 1-2014; 17-20 | |
dc.identifier | 0140-1963 | |
dc.identifier | http://hdl.handle.net/11336/4176 | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/1891082 | |
dc.description.abstract | 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 50 Kg N.Ha-1.year-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 volkmani, and showed no response to N addition whereas foliar N concentration of grasses significantly increased with N fertilization (P<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% of their annual requirement from the soil. In contrast, shrubs have a closer N cycle, absorbing between 7 to 16% 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. | |
dc.language | eng | |
dc.publisher | Elsevier | |
dc.relation | info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0140196313002097 | |
dc.relation | info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jaridenv.2013.11.002 | |
dc.relation | info:eu-repo/semantics/altIdentifier/issn/0140-1963 | |
dc.rights | https://creativecommons.org/licenses/by-nc-nd/2.5/ar/ | |
dc.rights | info:eu-repo/semantics/restrictedAccess | |
dc.subject | Arid ecosystems | |
dc.subject | Grasses | |
dc.subject | Manipulative experiments | |
dc.subject | Fertilization | |
dc.title | Grasses have larger response than shrubs to increased nitrogen availability: A fertilization experiment in the Patagonian Steppe | |
dc.type | Artículos de revistas | |
dc.type | Artículos de revistas | |
dc.type | Artículos de revistas | |