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(den-droh-cruh-NOL-uh-gee) means “the study of tree time.” Usually called tree-ring dating, dendrochronology is a science based on the fact that every growth season a tree adds a new layer of wood to its trunk.

Over time, these yearly growth layers form a series of light and dark concentric circles, or tree rings, that are visible on cross sections of felled trees.

By counting the dark ring segments, scientists can tell a tree’s age if the cross section of the trunk is complete. Based at the University of Arizona in Tucson, Douglass wanted to know how sun spot activity affected climate, and his research soon led him to pioneering tree-ring analysis.

Because the width of tree rings varies with growing conditions, scientists also learn about local climate during the tree’s lifetime by comparing the rings’ different widths. For instance, higher rainfall and a longer growing season produces a wider ring than a year with low rainfall and prolonged cold. Douglass was among the first to notice that trees in a geographic area develop the same growth-ring patterns because they experience the same climatic conditions.

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Ring-width and stable isotope time series for three to four trees from multiple sites were statistically analyzed with a computer program commonly used in dendrochronology (COFECHA).Archaeologists sometimes study the ring patterns in beams or other pieces of wood from archaeological sites to help date the sites; they may also study the ring patterns to infer the local climatic history.Tree-ring analysis requires observation and pattern recognition.The science of dendrochronology relies on cross-dating techniques to ensure that a particular tree ring is associated with a specific year.Some tree species and environments produce ring-width time series that are difficult to cross-date.Shortly afterwards, Powell (1932) compared variation in wheat yields in Saskatchewan to ring-width variation in white spruce and some hardwood species.Much of the tree ring research in western Canada has at the Laboratory of Tree Ring research in Tucson, Arizona, including the first studies of Douglas Fir in Alberta (Schulman, 1947), the first regional dendrochronological network for western North America (Drew, 1975), regional climatic reconstructions (Fritts, 1971; Fritts, et al., 1979; Fritts and Lough, 1985), and a dendrohydrological study of the Peace-Athabasca delta (Stockton and Fritts, 1973).Instead of working with entire cross sections of trees, dendrochronologists (tree-ring researchers) often use long, slender cores extracted from trees by a hollow tool.The diagram below shows two cores from different trees in the same area.This site stores nothing other than an automatically generated session ID in the cookie; no other information is captured.In general, only the information that you provide, or the choices you make while visiting a web site, can be stored in a cookie.This results in the cambium cells becoming smaller and thicker-walled.By winter, when the sap finally stops flowing, a smooth dark ring marks the end of the tree’s annual growth.Below are the most common reasons: This site uses cookies to improve performance by remembering that you are logged in when you go from page to page.To provide access without cookies would require the site to create a new session for every page you visit, which slows the system down to an unacceptable level.




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It was added to the South Australian Heritage Register on 12 October 1995 and added to the Commonwealth Heritage List on 8 November 2011.


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