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Forest growth responses to drought at short- and long-term scales in spain : squeezing the stress memory from tree rings / Jesús Julio Camarero in Frontiers in ecology and evolution, 6 (2018) 

Public Citation [article]  inFrontiers in ecology and evolution > 6 (2018) . - 10.3389/fevo.2018.00009 Titre : Forest growth responses to drought at short- and long-term scales in spain : squeezing the stress memory from tree rings Type de document : Électronique Auteurs : Jesús Julio Camarero ; Antonio Gazol ; Gabriel Sangüesa-Barreda ; Alejandro Cantero ; Angela Sánchez-Miranda ; Elena Granda ; Xavier Serra-Maluquer ; Ricardo Ibáñez Année de publication : 2018 Article en page(s) : 10.3389/fevo.2018.00009 Langues : Anglais (eng) Catégories : [CBNPMP-Géographique] Espagne [CBNPMP-Thématique] Relations climat-végétation Résumé : Drought-triggered declines in forest productivity and associated die-off events have increased considerably due to climate warming in the last decades. There is an increasing interest in quantifying the resilience capacity of forests against climate warming and drought to uncover how different stands and tree species will resist and recover after more frequent and intense droughts. Trees form annual growth rings that represent an accurate record of how forest growth responded to past droughts. Here we use dendrochronology to quantify the radial growth of different forests subjected to contrasting climatic conditions in Spain during the last half century. Particularly, we considered four climatically contrasting areas where dominant forests showed clear signs of drought-induced dieback. Studied forests included wet sites dominated by silver fir (Abies alba) in the Pyrenees and beech (Fagus sylvatica) stands in northern Spain, and drought-prone sites dominated by Scots pine (Pinus sylvestris) in eastern Spain andblack pine (Pinus nigra) in the semi-arid south-eastern Spain. We quantified the growth reduction caused by different droughts and assessed the short-and long-term resilience capacity of declining vs. non-declining trees in each forest. In all cases, drought induced a marked growth reduction regardless tree vigor. However, the capacity to recover after drought (resilience) at short- and long-term scales varied greatly between declining and non-declining individuals. In the case of beech and silver fir, non-declining individuals presented greater growth rates and capacity to recover after drought than declining individuals. For Scots pine, the resilience to drought was found to be lower in recent years regardless the tree vigor, but the growth reduction caused by successive droughts was more pronounced in declining than in non-declining individuals. In the black pine forest an extreme drought induced a marked growth reduction in declining individuals when accounting for age effects on growth rates. We demonstrate the potential of tree-ring data to record short- and long-term impacts of drought on forest growth and to quantify the resilience capacity of trees. Lien pérenne : DOI : 10.3389/fevo.2018.00009 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=143483 Camarero, Jesús Julio, Gazol, Antonio, Sangüesa-Barreda, Gabriel, Cantero, Alejandro, Sánchez-Miranda, Angela, Granda, Elena, Serra-Maluquer, Xavier, Ibáñez, Ricardo 2018 Forest growth responses to drought at short- and long-term scales in spain : squeezing the stress memory from tree rings. Frontiers in ecology and evolution, 6: 10.3389/fevo.2018.00009.

Documents numériques

Consultable Article (2018) URL

Functional diversity enhances silver fir growth resilience to an extreme drought / Antonio Gazol in Journal of ecology, 104 (2016) 

Public Citation [article]  inJournal of ecology > 104 (2016) . - 1063-1075 Titre : Functional diversity enhances silver fir growth resilience to an extreme drought Type de document : Électronique Auteurs : Antonio Gazol ; Jesús Julio Camarero Année de publication : 2016 Article en page(s) : 1063-1075 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Relations climat-végétation Résumé : It is expected that extreme climate events such as droughts will increase in both severity and intensity as a consequence of forecasted climate change. Complementarity among tree species in resource acquisition strategy may reduce interspecific competition and increase the occurrence of facilitative interactions, resulting in an improved tree growth and resilience to extreme climatic events. However, the response of individual trees growing in more functionally diverse stands to extreme events is still under debate. We investigate the growth response of silver fir (Abies alba) to an extreme drought event which occurred in 1985–1986 in the Central Spanish Pyrenees and how the growth and resilience of trees relate to their neighbourhood functional diversity, stand heterogeneity and intraspecific and interspecific competition. Dendroecological methods were used to reconstruct radial growth. We recorded all tree species living around each sampled tree and calculated indices of intra- and interspecific competition among coexisting trees. Functional diversity around each focal tree was calculated by using the Rao's quadratic entropy. Silver fir growth decreased significantly in response to the drought in the vast majority of trees, but most of them showed a growth recovery 3 years later. Despite most trees showed negative growth trends following the drought event (70%), those trees growing in more functionally diverse stands were more resilient, recovered more quickly and displayed greater growth and growth trends. Synthesis. The presented findings support the growing body of evidence that shows a positive impact of diversity on forest function. In addition, we provide a direct linkage between tree growth response to climate at the individual tree scale and a direct quantification of neighbourhood functional diversity and competition. An enhanced functional diversity facilitating a more efficient use of resources at the interspecific level and potentially increasing facilitative interactions contributes to lessening the negative impacts of extreme events as droughts on forest growth. Lien pérenne : DOI : 10.1111/1365-2745.12575 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=143484 Gazol, Antonio, Camarero, Jesús Julio 2016 Functional diversity enhances silver fir growth resilience to an extreme drought. Journal of ecology, 104: 1063-1075.

Documents numériques

Consultable Article (2016) URL