Dating living trees

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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. Dendrochronology is useful for determining the precise age of samples, especially those that are too recent for radiocarbon dating , which always produces a range rather than an exact date. However, for a precise date of the death of the tree a full sample to the edge is needed, which most trimmed timber will not provide. It also gives data on the timing of events and rates of change in the environment most prominently climate and also in wood found in archaeology or works of art and architecture, such as old panel paintings.
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Dendrochronology

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List of oldest trees - Wikipedia

You can use this simple tree age calculator to determine the estimated age of living trees. Simply use a measuring tape to measure the circumference of the tree, input the type of tree, and then click on the "Calculate" button to calculate the tree's age. It can be very difficult to calculate the age of a tree if you don't know when it was planted. However, it is possible to estimate the tree's age through an approximation technique that is based on the circumference of its trunk. This method, which was first proposed by the International Society of Arboriculture ISA , relies on a simple formula that uses the tree diameter at breast height DBH , which is the tree's diameter at a point of 4.
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Dendrochronology - Tree Rings as Records of Climate Change

Until , the oldest individual tree in the world was Methuselah, a 4,year-old Great Basin bristlecone pine Pinus longaeva in the White Mountains of California. The tree — named Adonis after the Greek god of beauty, youth and desire — took root in A. Europe is home to some even longer-lived trees, but these have yet to be officially dated. For instance, living in a churchyard of the Llangernyw village in North Wales, the Llangernyw Yew is estimated to be at least 4, years old.
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The lifespan of a tree depends on the tree variety and its growing conditions. Trees have some of the longest lifespans in the plant kingdom, with some conifer species outliving all other varieties. The longest living tree species may stand alone or live in dense forests, such as the redwood and sequoias in California, or they may be used in residential landscaping as ornamental trees. The Douglas fir tree Pseudotsuga menziesii can reach heights up to feet with a width of 14 feet, living up to 1, years. Traditionally, the Douglas fir provided wood for telephone poles and railroad ties.
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