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

Content Provider	Springer Nature Link
Author	Andrés, Ester González Camarero, J. Julio Büntgen, Ulf
Copyright Year	2015
Abstract	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 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.
Starting Page	941
Ending Page	952
Page Count	12
File Format	PDF
ISSN	09311890
Journal	Trees
Volume Number	29
Issue Number	3
e-ISSN	14322285
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-03-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Basal area increment Drought stress Mediterranean Pinus uncinata Temperature Treeline Forestry Plant Sciences Agriculture Plant Anatomy/Development Plant Pathology Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Ecology Physiology Plant Science Forestry

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