Tree ring cross dating software
For information about the general field of dendrochronology, please refer to Stokes and Smiley (1968), Fritts (1976), and Cook and Kairiukstis (1990). When you have reached the centre of the tree, insert the spoon carefully. Push it in as far as it will go, then unscrew the borer 1 turn.
Ayotte On this page is some basic information about collecting tree cores. Areas where annual rings may be distorted, such as near branches on uphill or downhill sides of the trunk, should be avoided.
Narrow rings are recorded as they occur on strips of graph paper with 2 mm divisions.
The width of each ring is compared to that of the rings on either side of it; a long vertical line is drawn where a ring is considerably narrower than its neighbor, and a shorter line when it is only slightly narrower.
Since growth of the tree begins at the root system, a core taken above the base may have a much younger estimated age than one taken directly at ground level.
You need multiple cores of a tree to be able to crossdate the cores.
The oldest cores are crossdated to all other cores in order to formulate a master chronology.
Data and study description information can be contributed by emailing decadal format data files to [email protected]
The basic dendrochronological study involves the development of a chronology derived from annual tree-ring increments.
After the cores are left to dry, they are glued vertically into a groove in a wooden block using water-soluble glue (carpenter's glue).
Problems may arise when missing, locally absent or false rings are present.
A ring is normally formed every growing season, but in some years of unfavorable climatic conditions, a tree may not develop an annual ring (missing ring).