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dc.contributor.authorIbañez, Mercedes
dc.contributor.authorAltimir, Núria
dc.contributor.authorRibas Artola, Àngela
dc.contributor.authorEugster, Werner
dc.contributor.authorSebastià, Ma. T.
dc.date.accessioned2020-09-07T08:51:52Z
dc.date.available2020-10-01T22:25:14Z
dc.date.issued2020
dc.identifier.issn1469-5146
dc.identifier.urihttp://hdl.handle.net/10459.1/69462
dc.description.abstractUnderstanding the mechanisms underlying net ecosystem CO2 exchange (NEE) in mountain grasslands is important to quantify their relevance in the global carbon budget. However, complex interactions between environmental variables and vegetation on NEE remain unclear; and there is a lack of empirical data, especially from the high elevations and the Mediterranean region. A chamber-based survey of CO2 exchange measurements was carried out in two climatically contrasted grasslands (montane v. subalpine) of the Pyrenees; assessing the relative contribution of phenology and environmental variables on CO2 exchange at the seasonal scale, and the influence of plant functional type dominance (grasses, forbs and legumes) on the NEE light response. Results show that phenology plays a crucial role as a CO2 exchange driver, suggesting a differential behaviour of the vegetation community depending on the environment. The subalpine grassland had a more delayed phenology compared to the montane, being more temperature than water constrained. However, temperature increased net CO2 uptake at a higher rate in the subalpine than in the montane grassland. During the peak biomass, productivity (+74%) and net CO2 uptake (NEE +48%) were higher in the subalpine grassland than in the montane grassland. The delayed phenology at the subalpine grassland reduced vegetation's sensitivity to summer dryness, and CO2 exchange fluxes were less constrained by low soil water content. The NEE light response suggested that legume dominated plots had higher net CO2 uptake per unit of biomass than grasses. Detailed information on phenology and vegetation composition is essential to understand elevation and climatic differences in CO2 exchange.ca_ES
dc.description.sponsorshipThe current study was developed within the project CAPACITI supported by a Marie Curie Intra European Fellowship within the 7th European Community Framework for Nuria Altimir (PIEF-GA-2010-275855) and the project BIOGEI (CGL2013-49142-C21-R) supported by a FPI fellowship for Mercedes Ibáñez (BES-2014-069243) funded by the Spanish Science Foundation (FECYT).ca_ES
dc.language.isoengca_ES
dc.publisherCambridge University Pressca_ES
dc.relationMINECO/PN2013-2016/CGL2013-49142-C2-1-Rca_ES
dc.relation.isformatofVersió postprint del document publicat a: https://doi.org/10.1017/S0021859620000179ca_ES
dc.relation.ispartofThe Journal of Agricultural Science, 2020, vol. 158, núm. 1-2, p. 3-14ca_ES
dc.rights(c) Cambridge University Press, 2020ca_ES
dc.titlePhenology and plant functional type dominance drive CO2 exchange in seminatural grasslands in the Pyreneesca_ES
dc.typeinfo:eu-repo/semantics/articleca_ES
dc.identifier.idgrec030142
dc.type.versioninfo:eu-repo/semantics/acceptedVersionca_ES
dc.rights.accessRightsinfo:eu-repo/semantics/openAccessca_ES
dc.identifier.doihttps://doi.org/10.1017/S0021859620000179
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/FP7/275855ca_ES


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