Dendrochronology Lab

The Dendrochonology Lab carries out investigations based on tree-ring patterns. We collaborate actively with other work groups of the Department of Geography analysing ecological processes and offering quantitative data on their direction, strength and temporal dynamics. Collaborating with landscape ecologists we have studied effects of mire restoration on radial increment of trees. Our research group has investigated how mire drainage affects tree growth in space and time in raised bogs. Results of these investigations enable us to better understand effects of mire drainage and restoration on ecosystems. Another ecological topic is investigation of intra-annual radial growth of trees by band dendrometers. This technique detects seasonal dynamics of radial growth of trees with high resolution. The dendrometer measurements are used in the context of meteorological conditions. Special methods are applied to study growth disturbances of trees, both natural and anthropogenic. In collaboration with climatologists, we study effects of meteorological factors (mainly air temperature and precipitation) on formation of series of tree-ring widths in changing climate. Our study objects involve both conifers and broadleaf tree species in Estonia as well as abroad (e.g. in Iceland, Finland, Latvia, the Himalayas and tropical rainforests). We are carrying out a comparative dendroclimatic study of growth dynamics between tree species growing on mineral and peat soils.

Another research direction is dendrochronological investigation of historical buildings, mainly for the purpose of exact dating. Conjointly, tree-ring chronologies of relevant tree species are built up and extended into the past. At present, tree-ring dating investigations in Estonia have been applied e.g. for wrecks of ships, painting panels, and musical string instruments, to name a few. A new object class for investigation is historical doors. In the dating process, often the question of wood provenance and historical timber trade (dendro-geography) arises. To follow this direction, we have excellent cooperation with many colleagues primarily in the countries around the Baltic Sea. We enjoy very good cooperation with Estonian archaeologists, art scholars, historians and restorers, and forest researchers in the Estonian University of Life Sciences.

Research at the dendrochronology lab requires persistence and punctuality in microscope work, knowledge in wood anatomy, physiology and ecology, skills in statistical methods and generalization. New scientific knowledge will be the reward.