Aspen is a common name for certaintree species in thePopulus sect. Populus, of thePopulus (poplar)genus.[1]
These species are called aspens:
Aspen trees are all native to cold regions with cool summers, in the north of thenorthern hemisphere, extending south at high-altitude areas such as mountains or high plains. They are all medium-sizeddeciduous 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 flattenedpetioles which reduceaerodynamic drag on the trunk and branches.
Aspens typically grow in environments that are otherwise dominated byconiferous tree species, and which are often lacking other large deciduous tree species. Aspens have evolved several adaptations that aid their survival in such environments. One is the flattened leaf petiole, which reduces aerodynamic drag during high winds and decreases the likelihood of trunk or branch damage. Dropping leaves in the winter (like most but not all other deciduous plants) also helps to prevent damage from heavy winter snow. Additionally, the bark is photosynthetic, meaning that growth is still possible after the leaves have been dropped. The bark also containslenticels that serve as pores for gas exchange, in which their respiratory function resembles that of thestomata on leaves.
Aspens are also aided by therhizomatic nature of their root systems. Most aspens grow in largeclonal colonies, derived from a single seedling, and spread by means ofroot suckers; new stems in the colony may appear at up to 30–40 m (100–130 ft) from the parent tree. Each individual tree can live for 40–150 years above ground, but theroot system of the colony is long-lived. In some cases, this is for thousands of years, sending up new trunks as the older trunks die off above ground. For this reason, it is considered to be an indicator of ancient woodlands. One such colony in Utah, given the nickname of "Pando", has been estimated as being 80,000 years of age;[3] if validated, this would likely make it theoldest living colony of aspens. Some aspen colonies become very large with time, spreading about 1 m (3 ft) per year, eventually covering many hectares. They are able to surviveforest fires, because the roots are below the heat of the fire, and new sprouts appear after the fire burns out. The high stem turnover rate combined with the clonal growth leads to proliferation in aspen colonies. The high stem turnover regime supports a diverse herbaceous understory.[citation needed]
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Aspen seedlings do not thrive in the shade, and it is difficult for seedlings to establish in an already mature aspen stand. Fire indirectly benefits aspen trees, since it allows the saplings to flourish in open sunlight in the burned landscape, devoid of other competing tree species. Aspens have increased in popularity as a forestry cultivation species, mostly because of their fast growth rate and ability to regenerate from sprouts. This lowers the cost ofreforestation after harvesting since no planting orsowing is required.
Aspen populations have been declining in some areas; this "sudden aspen death" has been attributed to factors as diverse asclimate change exacerbating drought and modifying precipitation patterns; recruitment failure from herbivory or grazing preventing new trees from coming up after old trees die; and to successional replacement by conifers due to fire suppression altering forest diversity and creating conditions where aspen may be at less of an advantage.
In contrast with many trees, aspenbark isbase-rich, meaning aspens are important hosts forbryophytes[4] and act as food plants for thelarvae of butterfly (Lepidoptera) species.
Young aspen bark is an important seasonal forage for theEuropean hare and other animals in early spring. Aspen is also a preferred food of theEuropean beaver.Elk,deer, andmoose not only eat the leaves but also strip the bark with their front teeth.
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Aspen wood is white and soft, but fairly strong, and has low flammability. It has a number of uses, notably for makingmatches andpaper where its low flammability makes it safer to use than most other woods.[citation needed] Shredded aspen wood is used for packing and stuffing, sometimes calledexcelsior (wood wool). Aspen flakes are the most common species of wood used to makeoriented strand boards.[5] It is also a popular animal bedding, since it lacks thephenols associated withpine andjuniper, which are thought to causerespiratory system ailments in some animals. Heat-treated aspen is a popular material for the interiors ofsaunas. While standing trees sometimes tend to rot from the heart outward, the dry timber weathers very well, becoming silvery-grey and resistant to rotting and warping, and has traditionally been used for rural construction in the northwestern regions of Russia (especially for roofing, in the form of thin slats).
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