The COST-action workshop DendroGlobal: quantifying drought tolerance by using dendrometers was held in Ghent, Belgium, from 18 to 20 September 2013 and brought together the following COST-members: Tommaso Anfodillo, Dirk de Pauw, Patrick Fonti, David Frank, Stefan Mayr, Kathy Steppe, Rafael Poyatos, Maurits Vandegehuchte and Roman Zweifel (only on September 19th). During three days, DendroGlobal aimed at: (1) verifying whether the scientific concept of using dendrometer data to quantify drought tolerance is valid; (2) preparing the strategy and the procedure for data collection of already existing dendrometer data over the globe; and (3) defining the rules for data contributors and co-authors.
To stimulate the discussion the COST action participants prepared presentations and/or preliminary data analyses from their own dendrometer data sets. A first preliminary database included seven sites and ~10 tree species for data exploration purposes. The discussion included:
- a review about the information contained in stem diameter variation data
- a list of physiological and ecological valuable metrics and their definition
- a discussion on the use of terminology (e.g., the terms “growth”, “tolerance”, “stress”)
- the link between stem diameter variation and the environment
- the evaluation of variability between trees, species, sites and environments
- the question of quantifying drought tolerance and its comparison between trees, species, sites and environments
- the preparation of an action plan
- an evaluation of capacities required to create, maintain and use the database
- an evaluation of possible conflicts with other dendrometer networks
- a description of requirements for the data entering the database
- an evaluation of participation rules considering fair conditions for data contributors and COST-action participants
- the preparation of a short text describing the role and rewards of data-contributors.
The output of the DendroGlobal workshop served as direct input to the presentation of the short- to long-term concepts and the working activities of the DendroGlobal topic group (TG 8) of the COST Action STReESS, discussed at the meeting in Sarajevo (October 2013).