Early-Warning Signals of Individual Tree Mortality Based on Annual Radial Growth

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http://hdl.handle.net/10138/300854

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Cailleret , M , Dakos , V , Jansen , S , Robert , E M R , Aakala , T , Amoroso , M M , Antos , J A , Bigler , C , Bugmann , H , Caccianaga , M , Camarero , J-J , Cherubini , P , Goeya , M R , Cufar , K , Das , A J , Davi , H , Gea-Izquierdo , G , Gillner , S , Haavik , L J , Hartmann , H , Heres , A-M , Hultine , K R , Janda , P , Kane , J M , Kharuk , V I , Kitzberger , T , Klein , T , Levanic , T , Linares , J-C , Lombardi , F , Mäkinen , H , Meszaros , I , Metsaranta , J M , Oberhuber , W , Papadopoulos , A , Petritan , A M , Rohner , B , Sanguesa-Barreda , G , Smith , J M , Stan , A B , Stojanovic , D B , Laura Suarez , M , Svoboda , M , Trotsiuk , V , Villalba , R , Westwood , A R , Wyckoff , P H & Martinez-Vilalta , J 2019 , ' Early-Warning Signals of Individual Tree Mortality Based on Annual Radial Growth ' , Frontiers in plant science , vol. 9 , 1964 . https://doi.org/10.3389/fpls.2018.01964

Title: Early-Warning Signals of Individual Tree Mortality Based on Annual Radial Growth
Author: Cailleret, Maxime; Dakos, Vasilis; Jansen, Steven; Robert, Elisabeth M.R.; Aakala, Tuomas; Amoroso, Mariano M.; Antos, Joe A.; Bigler, Christof; Bugmann, Harald; Caccianaga, Marco; Camarero, Jesus-Julio; Cherubini, Paolo; Goeya, Marie R.; Cufar, Katarina; Das, Adrian J.; Davi, Hendrik; Gea-Izquierdo, Guillermo; Gillner, Sten; Haavik, Laurel J.; Hartmann, Henrik; Heres, Ana-Maria; Hultine, Kevin R.; Janda, Pavel; Kane, Jeffrey M.; Kharuk, Vlachelsav I.; Kitzberger, Thomas; Klein, Tamir; Levanic, Tom; Linares, Juan-Carlos; Lombardi, Fabio; Mäkinen, Harri; Meszaros, Ilona; Metsaranta, Juha M.; Oberhuber, Walter; Papadopoulos, Andreas; Petritan, Any Mary; Rohner, Brigitte; Sanguesa-Barreda, Gabriel; Smith, Jeremy M.; Stan, Amanda B.; Stojanovic, Dejan B.; Laura Suarez, Maria; Svoboda, Miroslav; Trotsiuk, Volodymyr; Villalba, Ricardo; Westwood, Alana R.; Wyckoff, Peter H.; Martinez-Vilalta, Jordi
Contributor: University of Helsinki, Boreal forest dynamics and biodiversity research group
Date: 2019-01-08
Language: eng
Number of pages: 14
Belongs to series: Frontiers in plant science
ISSN: 1664-462X
URI: http://hdl.handle.net/10138/300854
Abstract: Tree mortality is a key driver of forest dynamics and its occurrence is projected to increase in the future due to climate change. Despite recent advances in our understanding of the physiological mechanisms leading to death, we still lack robust indicators of mortality risk that could be applied at the individual tree scale. Here, we build on a previous contribution exploring the differences in growth level between trees that died and survived a given mortality event to assess whether changes in temporal autocorrelation, variance, and synchrony in time-series of annual radial growth data can be used as early warning signals of mortality risk. Taking advantage of a unique global ring-width database of 3065 dead trees and 4389 living trees growing together at 198 sites (belonging to 36 gymnosperm and angiosperm species), we analyzed temporal changes in autocorrelation, variance, and synchrony before tree death (diachronic analysis), and also compared these metrics between trees that died and trees that survived a given mortality event (synchronic analysis). Changes in autocorrelation were a poor indicator of mortality risk. However, we found a gradual increase in inter- annual growth variability and a decrease in growth synchrony in the last similar to 20 years before mortality of gymnosperms, irrespective of the cause of mortality. These changes could be associated with drought-induced alterations in carbon economy and allocation patterns. In angiosperms, we did not find any consistent changes in any metric. Such lack of any signal might be explained by the relatively high capacity of angiosperms to recover after a stress-induced growth decline. Our analysis provides a robust method for estimating early-warning signals of tree mortality based on annual growth data. In addition to the frequently reported decrease in growth rates, an increase in inter-annual growth variability and a decrease in growth synchrony may be powerful predictors of gymnosperm mortality risk, but not necessarily so for angiosperms.
Subject: 4112 Forestry
tree mortality
ring-width
forest
biotic agents
variance
drought-induced tree
CARBON-ISOTOPE DISCRIMINATION
SCOTS PINE
RING GROWTH
HYDRAULIC DETERIORATION
RECOVERY RATES
tpping point
forest trees
climate
death
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