Dendro dating wood
In order to establish comprehensive continuous growth ring curves for periods longer than a tree’s lifetime it is necessary to use an overlapping system of individual curves for the establishment of master chronologies; in Europe trees normally live only 200 to 300 years.Standard curves exist for South and West Germany, for several regions of North Germany and, in part, for several areas in the Netherlands and France, and also for the Baltic area from which the wood for most Flemish and Dutch paintings was obtained.Hence, under adverse climatic conditions, the trees do not need to form a growth ring every year and may be characterized by totally or partially missing rings.
Only the latest measured growth ring of the panel can be determined to the exact year.
Dendrochronology focuses on the annual periodicity of growth which is controlled by the climate, e.g. In cool and temperate climates, there is a dormant season from autumn to spring and a growth season during the summer.
When the vegetative period begins, new cells for the transport of water from the roots to the top of the tree are formed.
• Sometimes the condition of a sample does not permit the determination of ring widths, as in the case of sapwood which may have suffered attack by insects, bacteria, or fungi or may have collapsed due to excess drying.
In these cases the number of rings cannot be accurately determined and no precise dating can occur.
In general terms this would mean the placement in time of one ring series relative to the other.