Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/124894
Title: Disparate effects of global-change drivers on mountain conifer forests: warming-induced growth enhancement in young trees vs. CO2 fertilization in old trees from wet sites
Author: Camarero, J.J.
Gazol, A.
Galván, J.D.
Sangüesa-Barreda, G.
Gutiérrez Merino, Emilia
Keywords: Canvis climàtics
Ecologia forestal
Climatic changes
Forest ecology
Issue Date: 31-Oct-2014
Publisher: John Wiley & Sons
Abstract: Theory predicts that the postindustrial rise in the concentration of CO2 in the atmosphere (ca ) should enhance tree growth either through a direct fertilization effect or indirectly by improving water use efficiency in dry areas. However, this hypothesis has received little support in cold-limited and subalpine forests where positive growth responses to either rising ca or warmer temperatures are still under debate. In this study, we address this issue by analyzing an extensive dendrochronological network of high-elevation Pinus uncinata forests in Spain (28 sites, 544 trees) encompassing the whole biogeographical extent of the species. We determine if the basal area increment (BAI) trends are linked to climate warming and increased ca by focusing on region- and age-dependent responses. The largest improvement in BAI over the past six centuries occurred during the last 150 years affecting young trees and being driven by recent warming. Indeed, most studied regions and age classes presented BAI patterns mainly controlled by temperature trends, while growing-season precipitation was only relevant in the driest sites. Growth enhancement was linked to rising ca in mature (151-300 year-old trees) and old-mature trees (301-450 year-old trees) from the wettest sites only. This finding implies that any potential fertilization effect of elevated ca on forest growth is contingent on tree features that vary with ontogeny and it depends on site conditions (for instance water availability). Furthermore, we found widespread growth decline in drought-prone sites probably indicating that the rise in ca did not compensate for the reduction in water availability. Thus, warming-triggered drought stress may become a more important direct driver of growth than rising ca in similar subalpine forests. We argue that broad approaches in biogeographical and temporal terms are required to adequately evaluate any effect of rising ca on forest growth.
Note: Versió postprint del document publicat a: https://doi.org/10.1111/gcb.12787
It is part of: Global Change Biology, 2014, vol. 21, num. 2, p. 738-749
URI: http://hdl.handle.net/2445/124894
Related resource: https://doi.org/10.1111/gcb.12787
ISSN: 1354-1013
Appears in Collections:Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)

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