A synthesis of radial growth patterns preceding tree mortality
CAMARERO, Jesus J.
Instituto Pirenaico de Ecologìa = Pyrenean Institute of Ecology [Zaragoza] [IPE - CSIC]
Instituto Pirenaico de Ecologìa = Pyrenean Institute of Ecology [Zaragoza] [IPE - CSIC]
COCHARD, Hervé
Laboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
Laboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
GEA-IZQUIERDO, Guillermo
Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria = National Institute for Agricultural and Food Research and Technology [INIA]
Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria = National Institute for Agricultural and Food Research and Technology [INIA]
LOPEZ RODRIGUEZ, Rosa Ana
Laboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
Laboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
SANGUESA-BARREDA, Gabriel
Instituto Pirenaico de Ecologìa = Pyrenean Institute of Ecology [Zaragoza] [IPE - CSIC]
Instituto Pirenaico de Ecologìa = Pyrenean Institute of Ecology [Zaragoza] [IPE - CSIC]
SUAREZ, Maria L.
Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires] [CONICET]
< Reduce
Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires] [CONICET]
Language
en
Article de revue
This item was published in
Global Change Biology. 2016, vol. 23, n° 4, p. 16 p.
Wiley
English Abstract
Tree mortality is a key factor influencing forest functions and dynamics, but our understanding of the mechanisms leading to mortality and the associated changes in tree growth rates are still limited. We compiled a new ...Read more >
Tree mortality is a key factor influencing forest functions and dynamics, but our understanding of the mechanisms leading to mortality and the associated changes in tree growth rates are still limited. We compiled a new pan-continental tree-ring width database from sites where both dead and living trees were sampled (2970 dead and 4224 living trees from 190 sites, including 36 species), and compared early and recent growth rates between trees that died and those that survived a given mortality event. We observed a decrease in radial growth before death in ca. 84% of the mortality events. The extent and duration of these reductions were highly variable (1-100years in 96% of events) due to the complex interactions among study species and the source(s) of mortality. Strong and long-lasting declines were found for gymnosperms, shade- and drought-tolerant species, and trees that died from competition. Angiosperms and trees that died due to biotic attacks (especially bark-beetles) typically showed relatively small and short-term growth reductions. Our analysis did not highlight any universal trade-off between early growth and tree longevity within a species, although this result may also reflect high variability in sampling design among sites. The intersite and interspecific variability in growth patterns before mortality provides valuable information on the nature of the mortality process, which is consistent with our understanding of the physiological mechanisms leading to mortality. Abrupt changes in growth immediately before death can be associated with generalized hydraulic failure and/or bark-beetle attack, while long-term decrease in growth may be associated with a gradual decline in hydraulic performance coupled with depletion in carbon reserves. Our results imply that growth-based mortality algorithms may be a powerful tool for predicting gymnosperm mortality induced by chronic stress, but not necessarily so for angiosperms and in case of intense drought or bark-beetle outbreaks.Read less <
Keywords
angiosperme
gymnosperme
pathogène
mort
sécheresse
développement
mortalité des arbres
English Keywords
angiosperms
death
drought
growth
gymnosperms
pathogens
ring-width
tree mortality
development
Origin
Hal imported