Crossdating by skeleton plotting

Examples of results are presented for specimens from sensitive, moderate, and complacent sites.FORTRAN program listings are included for two subroutines for (a) identifying small rings and (b) producing the plot.There could be any number of reasons for the difference—perhaps the tree that produced the compressed sample was shaded by other trees, for example.There is a way to present tree-ring information that allows easy comparison of trees with different growth rates.This is probably the most fundamental and important aspect of tree ring research.In essence, crossdating involves a form of pattern matching.If we only use the Skeleton Chi2 values as the selection criteria when dating 80 year long blocks of Scots pine grown here in Saltsjbaden towards a reference curve from the nearby island of Nmd, we will only have some 30% of our blocks with Chi2 values above 15 though with one third of them with a wrong dating.

The purpose of this lab is to learn the basic field, lab, and computational procedures necessary to conduct dendrochronological research.

This item is part of the Tree-Ring Research (formerly Tree-Ring Bulletin) archive.

It was digitized from a physical copy provided by the Laboratory of Tree-Ring research at The University of Arizona.

Especially wide rings are marked with a "b" (broad). If you draw your plots on strips of graph paper, these strips can be horizontally shifted relative to each other so you can find where the plots match each other.

Here, the curve is shown detrended (and somewhat zoomed out) to make the calculations behind the skeleton lines more obvious.


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