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Pando, a colony of quaking aspen, is one of the oldest-known clonal trees. Recent estimates of its age range up to 14,000 years old, and 18,000 years by the latest (2024) estimate. [ 1 ] It is located in Utah , United States.
Populus tremuloides is a deciduous tree native to cooler areas of North America, one of several species referred to by the common name aspen.It is commonly called quaking aspen, [2] [3] [4] trembling aspen, [2] [3] American aspen, [3] mountain or golden aspen, [5] trembling poplar, [5] white poplar, [5] and popple, [5] as well as others. [5]
Fast growth continues until the age of about 20 years, when crown competition increases. After that, growth speed decreases and culminates at about 30 years of age. Aspen can reach an age of 200 years. [3] It is a very hardy species and tolerates long, cold winters and short summers. [citation needed]
They are all medium-sized deciduous trees reaching 15–30 m (50–100 ft) tall. In North America, the aspen is referred to as quaking aspen or trembling aspen because the leaves "quake" or tremble in the wind. This is due to their flattened petioles which reduce aerodynamic drag on the trunk and branches. Aspen trees near Crested Butte, Colorado
Leaf of Populus grandidentata or "big-tooth aspen". Bigtooth aspens are dioecious, medium-sized deciduous trees with straight trunks and gently ascending branches.Heights at maturity are around 60–80 feet (18–24 m) with diameters of 8–10 inches (20–25 cm).
Mature trembling aspen trees (Populus tremuloides) with young regeneration in foreground, in Fairbanks, AlaskaThe genus has a large genetic diversity, and can grow from 15–50 m (49–164 ft) tall, with trunks up to 2.5 m (8 ft) in diameter.
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Measuring tree girth directly is a common educational technique allowing students to learn about their local environment in a practical manner. [14] It is often used in the primary setting to introduce topics such as measuring, using numbers and simple calculation. Simple techniques can be used to estimate tree age.