DENDROCHRONOLOGY. What is dendrochronology? Dendrochronology:  ology: the study of  chronos: time, or more specifically events in past time  dendros:

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Presentation transcript:

DENDROCHRONOLOGY

What is dendrochronology? Dendrochronology:  ology: the study of  chronos: time, or more specifically events in past time  dendros: using trees, or more specifically the growth rings of trees

What is dendrochronology? Tree-rings:  Each ring is a year of growth  Each year has early wood (light-colored) & late wood (dark- colored)

What is dendrochronology? How do we get wood samples?  If the tree is living, we take a core

What is dendrochronology? How do we get wood samples?  If the tree is dead, we take a cross-section of the whole tree

What is dendrochronology? The Life of a Tree 1769 AD - The tree began from seed The tree was 4 inches in diameter and 26 feet tall when Alaska was purchased from the Russians The tree was nearly 6 inches in diameter and 37 feet tall during WW I The tree was 22 inches in diameter and 77 feet tall when Alaska became the 49th State The tree was 25 inches in diameter and nearly 90 feet tall when it was felled.

Why is it important? Using tree-rings, we can learn about: Past fires:  The white arrows indicate distinct fires of the past  Each of those fires has been dendrochronologically dated to the year it burned  This research is being done at U of A in the Tree-ring Lab

Why is it important? We can also learn about:  climatology: past droughts or cold periods  geology: past earthquakes, volcanic eruptions  anthropology: past construction, habitation, and abandonment of societies

Why is it important? We can learn about how trees respond to changes in the environment (physiology)  Chemical analysis of rings can determine rates of water loss & photosynthesis through time  By measuring width of rings, can estimate growth rates of trees through time & understand what affects tree-growth

Why is it important? Many possibilities Such as settling the age of an historic violin m/cgi- bin/documentv1?DBLIST =cd01&DOCNUM=5592 8&TERMV=253:4:333:5: 21004:4:36400:4 m/cgi- bin/documentv1?DBLIST =cd01&DOCNUM=5592 8&TERMV=253:4:333:5: 21004:4:36400:4

How do we date tree-rings? Do we simply count them?  No!  Trees are trickier than that, some years they don’t grow at all  This creates “missing rings”  Sometimes we just have part of a tree, not the whole tree like the violin This is why we use pattern matching & match sections of growth with other trees

How do we date tree-rings? Step 1: Making skeleton plots  m m Step 2: Cross-dating  Match pattern with a master chronology  ching.htm ching.htm