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Complex climate constraints of upper treeline formation in the Pyrenees
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SYSNO ASEP 0473340 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Complex climate constraints of upper treeline formation in the Pyrenees Author(s) Gonzalez de Andres, E. (ES)
Julio Camarero, J. (ES)
Büntgen, Ulf (UEK-B) RID, ORCID, SAINumber of authors 3 Source Title Trees: structure and function. - : Springer - ISSN 0931-1890
Roč. 29, č. 3 (2015), s. 941-952Number of pages 12 s. Language eng - English Country DE - Germany Keywords pinus-uncinata ; spanish pyrenees ; summer temperature ; sierra-nevada ; wood density ; ring growth ; variability ; altitude ; mountain ; dynamics ; Basal area increment ; Drought stress ; Mediterranean ; Pinus uncinata ; Temperature ; Treeline Subject RIV EH - Ecology, Behaviour Institutional support RVO:67179843 - RVO:67179843 UT WOS 000354484000029 EID SCOPUS 84940005209 DOI 10.1007/s00468-015-1176-5 Annotation Key Message In the Pyrenees low temperature and scarce precipitation limit radial growth at treeline. The climatic drivers of treeline formation in mid-latitude mountains are temperature and also moisture variability.
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 tains, where changes in precipitation can also ecosystem functioning and productivity at moun-affect 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 degrees 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.Workplace Global Change Research Institute Contact Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Year of Publishing 2017
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