European Journal of Forest Research

, Volume 131, Issue 4, pp 1001–1012

Growth patterns and sensitivity to climate predict silver fir decline in the Spanish Pyrenees

Original Paper

DOI: 10.1007/s10342-011-0572-7

Cite this article as:
Linares, J.C. & Camarero, J.J. Eur J Forest Res (2012) 131: 1001. doi:10.1007/s10342-011-0572-7

Abstract

Patterns in radial growth have often been used to predict forest decline since they are regarded as indicators of the tree responses to long-term stressors. However, the sensitivity of tree growth to climate, as a proxy of the trees’ adaptive capacity to short-term climatic stress, has received less attention. Here, we used retrospective tree-ring analyses to determine whether growth patterns and sensitivity to climate are related to Abies alba (silver fir) decline in the Spanish Pyrenees. We used regional climatic data to calculate normalised temperatures and drought indexes. Basal-area increment (BAI) was measured for declining (defoliation >50%) and non-declining (defoliation <50%) silver firs in four stands with contrasting decline levels. A dynamic factor analysis (DFA) was applied to test the hypothesis that declining and non-declining trees have experienced different long-term growth trends. Growth sensitivity to climate was computed as the average change in BAI per unit of change in a given climate variable. Declining trees showed a negative growth trend during the last 20 years. Trees with lower relative BAI and negative BAI trends showed stronger growth sensitivity to climate and higher defoliation than trees with the opposite characteristics. Our findings underscore the idea that long-term climatic warming seems to be a major driving factor of growth decline in Pyrenean silver fir forests. Ongoing growth reduction and enhanced growth sensitivity to climate may promote vegetation shifts in these declining forests located near the xeric edge of the species distribution area.

Keywords

Abies albaBasal-area incrementClimate warmingDroughtDynamic factor analysisTree decline

Supplementary material

10342_2011_572_MOESM1_ESM.doc (359 kb)
Supplementary material 1 (DOC 359 kb)

Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  1. 1.Área de EcologíaUniversidad Pablo de OlavideSevillaSpain
  2. 2.ARAIDInstituto Pirenaico de Ecología (CSIC)ZaragozaSpain
  3. 3.Departamento de Sistemas Físicos, Químicos y NaturalesUniversidad Pablo de OlavideSevillaSpain