Complex climate constraints of upper treeline formation in the Pyrenees

González de Andrés, Ester; Camarero, Jesús Julio; Büntgen, Ulf

Publication:
Complex climate constraints of upper treeline formation in the Pyrenees

dc.contributor.author	González de Andrés, Ester
dc.contributor.author	Camarero, Jesús Julio	es_ES
dc.contributor.author	Büntgen, Ulf	es_ES
dc.contributor.department	Ciencias del Medio Natural	es_ES
dc.contributor.department	Natura Ingurunearen Zientziak	eu
dc.date.accessioned	2020-09-16T11:21:44Z
dc.date.available	2020-09-16T11:21:44Z
dc.date.issued	2015
dc.description.abstract	Alpine treelines are often induced by a threshold of minimum temperatures above which tree growth is generally not possible anymore. However, this worldwide pattern may not account for more drought-prone mountains, where changes in precipitation can also affect ecosystem functioning and productivity at higher elevations. Here, we aim to determine if tree-ring formation in ecotones along the Pyrenees indeed primarily depends on temperature means or also reflects hydroclimatic changes. The mean duration of the growing season at Pyrenean treelines was 177 days, lasting from mid-May to early November, which corresponds to a mean root-zone temperature of 8.2 °C. Temperatures during the early and late growing season were most critical for mountain pine growth at highest elevations, and above average spring temperatures also contributed to radial enlargement of tracheids. Sites showing more similar soil temperatures also presented more similar long-term growth trends indicating that local conditions trace regional influences on growth. Nevertheless, more wet conditions in summer enhanced growth at treelines subjected to more Mediterranean influence and therefore having a higher summer water deficit. A broader perspective reveals that soil moisture availability during spring and summer, however, also influence ring width formation at other treelines located in mid-latitude mountains separating temperate and semi-arid biomes. Our results suggest re-evaluating the idea of purely temperature-limited treelines, especially in mid-latitude mountains that experience moisture seasonality or where precipitation decreases with increasing elevation.	en
dc.description.sponsorship	E. González de Andrés acknowledges the support of an FPI fellowship (Economy and Innovation Ministry, Spain). J. Julio Camarero was supported by projects 387/2011 (OAPN, Agriculture an Environment Ministry, Spain) and CGL2011-26654 (Economy and Innovation Ministry, Spain). U. Büntgen was further supported by the Operational Programme of Education for Competitiveness of the Ministry of Education, Youth, and Sports of the Czech Republic (No. CZ.1.07/2.3.00/20.0248).	en
dc.format.extent	35 p.
dc.format.mimetype	application/pdf	en
dc.identifier.doi	10.1007/s00468-015-1176-5
dc.identifier.issn	1432-2285
dc.identifier.uri	https://academica-e.unavarra.es/handle/2454/38100
dc.language.iso	eng	en
dc.publisher	Springer	en
dc.relation.ispartof	Trees, 2015, 29, 941-952	en
dc.relation.projectID	info:eu-repo/grantAgreement/ES/6PN/CGL2011-26654	en
dc.relation.publisherversion	https://doi.org/10.1007/s00468-015-1176-5
dc.rights	© Springer-Verlag Berlin Heidelberg 2015	en
dc.rights.accessRights	info:eu-repo/semantics/openAccess	en
dc.rights.accessRights	Acceso abierto / Sarbide irekia	es
dc.subject	Basal area increment	en
dc.subject	Drought stress	en
dc.subject	Mediterranean	en
dc.subject	Pinus uncinata	en
dc.subject	Temperature	en
dc.subject	Treeline	en
dc.title	Complex climate constraints of upper treeline formation in the Pyrenees	en
dc.type	info:eu-repo/semantics/article	en
dc.type	Artículo / Artikulua	es
dc.type.version	info:eu-repo/semantics/acceptedVersion	en
dc.type.version	Versión aceptada / Onetsi den bertsioa	es
dspace.entity.type	Publication
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relation.isAuthorOfPublication.latestForDiscovery	006b0156-62a5-424f-b13a-319445defabb