Dating Trees

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Dendrochronology - Wikipedia
Dendrochronology - Determining the Age of a Tree - Tree . . .
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Dendrochronology (or tree -ring dating ) is the scientific method of dating tree rings (also called growth rings) to the exact year they were formed . As well as dating them, this can give data for dendroclimatology , the study of climate and atmospheric conditions during different periods in history from wood .
The tree -ring dating method works well for most trees ; however, it cannot be used to find the age of all trees . That is because some trees don't have rings or they have rings that are very hard to discern from a trunk cross section or sample . Trees that cannot be dated using the tree -ring method include some species of palm trees , as well as certain trees that grow in desert conditions .
Tree ring dating (dendrochronology) has been used in an attempt to extend the calibration of carbon-14 dating earlier than historical records allow . The oldest living trees , such as the Bristlecone Pines ( Pinus longaeva) of the White Mountains of Eastern California, were dated in 1957 by counting tree rings at 4,723 years old .
Several species of trees live almost indefinitely . The giant sequoia trees of California are known to live over 3,000 years, discerned through tree ring dating . Under normal circumstances, woody trees add one ring per year . A ring typically consists of a light-colored growth portion and a dark-colored portion produced in a stabilization season .
The date tree provides shade in the arid environment, as well as nutrition and medicine . In the desert climate, dates provide a staple food like potatoes, wheat, and rice in cooler climates . You can even grow a date tree from a date seed, found in a grocery store date .
Dates come from a large variety of date palm . The tree grows up to 40ft . tall and has 8in . spikes . The dates grow in large clusters at top of tree .Peel the date and eat flesh and spit out seeds . The fruit can also be dried and eaten dried .
Dates grow large, up to 120 feet (36 m .), and can live for 100 years . The large trees need room to grow and spread out the adventitious surface roots that anchor the plant and help it gather surface water . Take care when planting date palms to choose a location with plenty of space both vertically and horizontally .
Rings are not all the same width due to environmental factors, so when the same unique pattern of wider and narrower rings is found in different trees , this allows matching years to be lined up (called cross- dating ) . We currently have a cross-dated tree record over 14,000 rings in length before encountering a gap .
www .iqtree .org › doc › Dating
Now run IQ- TREE : iqtree -s ALN_FILE --date DATE_FILE --date-tip 0 This means that except for taxon6, all other taxa have the date of 0 for presence . If you know the root date, then you can set it via --date-root option . Dating an existing tree . If you already have a tree , you can use option -te TREE_FILE to ask IQ- TREE to load and fix this tree topology:
Palm trees , date palms included, propagate by creating new tree growth at the base of the parent tree . These new trees are called suckers or offshoots . These offshoots are a clone of the parent tree . Propagating by seed is also possible, but may produce a hybrid tree from cross-pollination .
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Dating Trees