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03-Feb-2018 14:24

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Wood is a solid and strong material as we all know, valued for its longevity and strength.

Each season of growth (typically annual but not always, we will examine this problem later) a new ring is set down in the body of the tree.

Some trees are also better than others for study (5). In this article we make the assumption that growth is annual with a distinct growing season.

Most tree species are reliable; oak is the most reliable tree type for tree rings - with not a single known case of a missing annual growth ring.

Alder and pine are notorious for occasionally “missing a year” which is confusing enough without the fact that those species also sometimes “double up”, by having two rings in the same growth season (8).

Birch and willow are not used at all because of the erratic nature of their growth cycle.

American Astronomre A E Douglass, who had a strong interest in studying the climate, developed the method around 1900 (4).

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On its own, a single record can tell us only a little about the environmental conditions of the time in a specific year of the growth of the tree, and of course the age of the tree at felling, but when we put hundreds and thousands of tree-ring records together, it can tell us a lot more. Due to the sweeping and diverse applications of this data, specialists can come from many academic disciplines.There are no degrees in dendrochronology because though it is useful across the board, the method itself is fairly limited.Trees are a ubiquitous form of plant life on planet Earth.

They are the lungs of the world, breathing in carbon dioxide and breathing out the oxygen on which animal life depends.These represent growth patterns that reflect the conditions of the season or the year (4) and it is these rings on which the entire study of dendrochronology is based.



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