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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 in a tree. As well as dating them, this can give data for dendroclimatology , the study of climate and atmospheric conditions during different periods in history from the wood of old trees.
In general over the lifetime of the tree the growth rate tends to increase, reach a maximum, then decline. [14] A 1987 study measured mean annual diameter increments ranging from 1.5–4.6 millimetres (0.059–0.181 in) per year with an overall average of 2.3 millimetres (0.091 in) per year.
Where: Y is the yield (volume, height, DBH, etc.) at times 1 and 2 and T 1 represents the year starting the growth period, and T 2 is the end year. Example: Say that the growth period is from age 5 to age 10, and the yield (height of the tree), is 14 feet at the beginning of the period and 34 feet at the end.
Quercus agrifolia, the California live oak, [3] or coast live oak, is an evergreen [4] live oak native to the California Floristic Province.Live oaks are so-called because they keep living leaves on the tree all year, adding young leaves and shedding dead leaves simultaneously rather than dropping dead leaves en masse in the autumn like a true deciduous tree. [5]
It is an evergreen, long-lived, monoecious tree living 1,200–2,200 years or more. [4] This species includes the tallest living trees on Earth, reaching up to 115.9 m (380.1 ft) in height (without the roots) and up to 8.9 m (29 ft) in diameter at breast height. These trees are also among the longest-living trees on Earth.
However, growth rates slow with age, and eventually turn negative as old trees senesce and the tops of the canopy are damaged in high winds, lightning strikes or during fires. Mean tree height after 8 years is about 15 m, and after 22 years is about 33 m. [26] After 50 years, trees are typically about 65 metres (213 ft) tall.