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In most North European countries (Sweden, UK, Denmark) and in the US, the most frequent planting scheme is the double row design with 0.75 m distance between the double rows and 1.5 m to the next double row, and a distance between plants ranging from 1 m to 0.4 m, corresponding to an initial planting density of 10,000–25,000 plants ha −1. [8]
Populus trichocarpa, the black cottonwood, [1] western balsam-poplar [2] or California poplar, is a deciduous broadleaf tree species native to western North America. It is used for timber , and is notable as a model organism in plant biology .
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]
The flowers and fruit are very much like those of the white poplar which is a relative of the aspens (Populus sect. Populus). Large western balsam poplar. The western balsam poplar, black cottonwood, or California poplar P. trichocarpa is native to western North America, from Alaska south to northern California. It is the largest species of ...
The leaves are large, deltoid (triangular), 4–10 cm (1 + 1 ⁄ 2 –4 in) long and 4–11 cm (1 + 1 ⁄ 2 – 4 + 1 ⁄ 4 in) broad with a truncated (flattened) base and a petiole 3–12 cm (1 + 1 ⁄ 4 – 4 + 3 ⁄ 4 in) long. The leaf is very coarsely toothed, the teeth are curved and gland tipped, and the petiole is flat; they are dark ...
Although the wood from Populus is known as poplar wood, a common high-quality hardwood "poplar" with a greenish colour is actually from an unrelated genus Liriodendron. Populus wood is a lighter, more porous material. Its flexibility and close grain make it suitable for a number of applications, similar to those of willow.
They are large, deciduous trees that are 15–30 m (50–100 ft) tall and diameters of 4 m (13 ft), [2] distinguished by thick, deeply fissured bark and triangular-based to diamond-shaped leaves that are green on both sides (without the whitish wax on the undersides) and without any obvious balsam scent in spring.
The width of wood wool fibers varies from 1.5 to 20 mm (0.059 to 0.79 in), while their length is usually around 500 mm 500 mm (20 in) (depending on the production process). In the UK there are specifications for dimensions, pH, moisture content and freedom from dust and small pieces, set by British Standard BS 2548 for wood wool for general ...
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