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Growth patterns and sensitivity to climate predict silver fir decline in the Spanish Pyrenees
Authors:Juan Carlos Linares  J Julio Camarero
Institution:1. área de Ecología, Universidad Pablo de Olavide, Ctra. Utrera km. 1, 41002, Sevilla, Spain
3. Departamento de Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, Ctra.Utrera km. 1, 41013, Sevilla, Spain
2. ARAID, Instituto Pirenaico de Ecología (CSIC), Avda. Monta?ana 1005, 50192, Zaragoza, Spain
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.
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