Dear all,
We know that some tree species could be hundreds years old. My question is how can determine a healthy tree plant is young, middle age or near to death.
By test the telomere length and telomerase activity or other ways. Zha
Estimating a Tree's Age by Species
Begin by determining the tree species and taking a diameter measurement (or convert a circumference to a diameter measurement) using a tape measure at diameter breast height or 4.5 feet above stump level. If you are using circumference, you will need to make this calculation to determine the tree diameter: Diameter = Circumference divided by 3.14 (pi)
Then calculate the age of a tree by multiplying the tree's diameter by its growth factor as determined by species (see list below): Here is the formula: Diameter X Growth Factor = Approximate Tree Age. Let's use a red maple to calculate age. A red maple's growth factor has been determined to be 4.5 and you have determined that its diameter is 10 inches: 10 inch diameter X 4.5 growth factor = 45 years. Remember that the growth factors provided are more accurate when taken from forest grown trees with competition.
Growth Factors by Tree Species
Red Maple Species - 4.5 Growth Factor X diameter Silver Maple Species - 3.0 Growth Factor X diameter Sugar Maple Species - 5.0 Growth Factor X diameter River Birch Species - 3.5 Growth Factor X diameter White Birch Species - 5.0 Growth Factor X diameter Shagbark Hickory Species - 7.5 Growth Factor X diameter Green Ash Species - 4.0 Growth Factor X diameter Black Walnut Species - 4.5 Growth Factor X diameter Black Cherry Species - 5.0 Growth Factor X diameter Red Oak Species - 4.0 Growth Factor X diameter White Oak Species - 5.0 Growth Factor X diameter Pin Oak Species - 3.0 Growth Factor X diameter Basswood Species - 3.0 Growth Factor X diameter American Elm Species - 4.0 Growth Factor X diameter Ironwood Species - 7.0 Growth Factor X diameter Cottonwood Species - 2.0 Growth Factor X diameter Redbud Species - 7.0 Growth Factor Dogwood Species - 7.0 Growth Factor X diameter Aspen Species - 2.0 Growth Factor X diameter.
From:https://www.thoughtco.com/estimating-forest-trees-age-1343321
A good explanation by Dr Ali Alhayany through which you can calculate approximate age. as such there is no calculation can definitely tell the age as the growth is governed by the environment prevailing during the period.
Dear, age of tree may also be worked out by measuring annual growth ring using increment borer.
Bye clicking below given link you get other ways for knowing the age of tree.
https://m.wikihow.com/Determine-the-Age-of-a-Tree
In fact, I want to ask how can I estimate how many years a tree can still live, especially about some rare and old trees. Even the tree looks healthy now.
Sorry for my English
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