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|dc.contributor.author||Galván, Juan Diego||-|
|dc.contributor.author||Camarero, Jesús Julio||-|
|dc.contributor.author||Alla, A. Q.||-|
|dc.identifier.citation||Journal of Ecology 100: 1233- 1244 (2012)||-|
|dc.description.abstract||[EN] 1.It is expected that climate warming will enhance tree growth of mountain conifer forests in cold regions. However, trees have shown unstable, age-related and site-dependent growth responses to climate throughout the past century, but information on the drivers controlling such responsiveness at the site and tree scales is lacking. We evaluated whether such changing growth responses are more influenced by site features, such as altitude, or by tree features, such as size and sapwood area. 2.We quantified the growth trends at the site and tree levels in Iberian Pinus uncinata forests using dendrochronology. Tree-ring width was converted to basal area increment (BAI) to assess the relationships between growth and site and tree variables over three time periods (1901-1994, 1901-1947, 1948-1994) using structural equation models. 3.Trees were older at higher altitudes, and the amount of sapwood decreased as trees aged. BAI trends were lower in the period 1948-1994 than in the period 1901-1947, that is, tree growth is decelerating, despite BAI values of both periods showing the reverse pattern. Sapwood area and, to a minor extent, tree age were the main positive and negative drivers, respectively, controlling BAI during the 20th century, whereas altitude played a minor role. 4.Synthesis. Our results highlight the relevance of tree individual characteristics as the main drivers modulating growth responses to climate warming. We conclude that climate warming will have a lower effect on radial growth in slow-growing high-elevation trees than in fast-growing low-elevation trees, which produce a greater sapwood area. Trees may become relatively insensitive to climate as they age and reach a size-related functional threshold linked to reduced sapwood production. Our results highlight the relevance of tree individual characteristics as the main drivers modulating growth responses to climate warming. We conclude that climate warming will have a lower effect on radial growth in slow-growing high elevation trees than in fast-growing low elevation trees, which produce a greater sapwood area. Trees may become relatively insensitive to climate as they age and reach a size-related functional threshold linked to reduced sapwood production. © 2012 British Ecological Society.||-|
|dc.description.sponsorship||This study was supported by projects 012 ⁄ 2008 and 387 ⁄ 2011 (Organismo Auto´nomo Parques Nacionales, MMAMRM, Spain) and by a JAE-CSIC grant to the ﬁrst author. J.J.C. and A.Q.A. acknowledge the support of ARAID and AECID, respectively. We also acknowledge funding by projects which contributed to build this data set (FoRmat EU ENV4-CT97-0641, CiCyT AMB95-0160). J.J.C. thanks the collaborative efforts carried out within the Globimed network (http://www.globimed.net). We thank the editor and three referees for improving a previous version of the manuscript.||-|
|dc.title||Sapwood area drives growth in mountain conifer forests||-|
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