Per citar aquest document: http://ddd.uab.cat/record/126587
Shifts in the elemental composition of plants during a very severe drought
Urbina Barreto, Ifigenia (Centre de Recerca Ecològica i Aplicacions Forestals)
Sardans i Galobart, Jordi (Centre de Recerca Ecològica i Aplicacions Forestals)
Beierkuhnlein, Carl (Universität Bayreuth. Department of Biogeography)
Jentsch, Anke (Universität Bayreuth. Disturbance Ecology and Vegetation Dynamics)
Backhausd, Sabrina (Universität Bayreuth. Disturbance Ecology and Vegetation Dynamics)
Grant, Kerstin (Universität Bayreuth. Disturbance Ecology and Vegetation Dynamics)
Kreyling, Juergen (Universität Bayreuth. Department of Biogeography)
Peñuelas, Josep (Centre de Recerca Ecològica i Aplicacions Forestals)

Data: 2015
Resum: Diverse plant functions (e. g. , growth, storage, defense and anti-stress mechanisms) use elements disproportionally. We hypothesized that plants growing under different abiotic and biotic conditions would shift their elemental compositions in response to a very severe drought. We tested this hypothesis by investigating the changes in foliar stoichiometry and species composition from a very severe drought. We also tested the effects of previous droughts (acclimation) on this response. Different species growing in the same community responded more similarly to a very severe drought than did individual species growing in different communities. The stoichiometric shifts were thus more community-dependent than species-dependent. The results also suggested that plants grown in monoculture were less stoichiometrically plastic during the drought than plants grown in a more diverse community. Previous exposure to long-term drought treatments in the same communities did not significantly affect the stoichiometric shifts during the new drought. Differential use of resources may have been responsible for these responses. Monocultured plants, which used the same resources in similar proportions, had more difficulty avoiding direct competition when the resources became scarcer. Moreover, each species tested had a particular elemental composition in all communities and climatic treatments. The differences in foliar elemental compositions were largest between plant functional groups (shrubs and grasses) and smallest among species within the same functional group. Global principal components analyses (PCAs) identified a general tendency for all species, independently of the community in which they grew, toward lower concentrations of K, N, P, Mg and S, and to higher concentrations of C and Fe as the drought advanced. This study has demonstrated the utility of analyses of differences and shifts in plant elemental composition for understanding the processes underlying the responses of plants to changes in biotic and abiotic environmental conditions.
Nota: Número d'acord de subvenció EC/FP7/610028
Nota: Número d'acord de subvenció MICINN/CSD2008-00040
Nota: Número d'acord de subvenció MINECO/CGL2013-48074-P
Nota: Número d'acord de subvenció AGAUR/2014/SGR-274
Drets: Tots els drets reservats
Llengua: Anglès
Document: article ; recerca ; acceptedVersion
Matèria: Biogeochemical niche ; Ecological stoichiometry ; Elemental composition ; Extreme Drought ; Nitrogen ; Phosphorus
Publicat a: Environmental and experimental botany, Vol. 111 (March 2015) , p. 63-73, ISSN 0098-8472

DOI: 10.1016/j.envexpbot.2014.10.005


Post-print
37 p, 855.7 KB

Accepted version
38 p, 1.8 MB

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Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals) > Imbalance-P
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 Registre creat el 2014-11-27, darrera modificació el 2016-06-09



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