Download - DENDROCHRONOLOGY
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DENDROCHRONOLOGY
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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
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What is dendrochronology?
Tree-rings: Each ring is a year of
growth Each year has early
wood (light-colored) & late wood (dark-colored)
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What is dendrochronology? How do we get wood samples?
If the tree is living, we take a core
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What is dendrochronology? How do we get wood samples?
If the tree is dead, we take a cross-section of the whole tree
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What is dendrochronology?
The Life of a Tree 1769 AD - The tree began
from seed 1867 - The tree was 4 inches
in diameter and 26 feet tall when Alaska was purchased from the Russians.
1917 - The tree was nearly 6 inches in diameter and 37 feet tall during WW I.
1959 - The tree was 22 inches in diameter and 77 feet tall when Alaska became the 49th State.
1977 - The tree was 25 inches in diameter and nearly 90 feet tall when it was felled.
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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
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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
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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
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Why is it important?
Many possibilities Such as settling the age
of an historic violin http://
libpub.dispatch.com/cgi-bin/documentv1?DBLIST=cd01&DOCNUM=55928&TERMV=253:4:333:5:21004:4:36400:4
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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
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How do we date tree-rings?
Step 1: Making skeleton plots http://www.ltrr.arizona.edu/skeletonplot/plotting.ht
m Step 2: Cross-dating
Match pattern with a master chronology http://www.ltrr.arizona.edu/skeletonplot/
patternmatching.htm