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Both male and female clones are grown. This is the tree most commonly grown in Great Britain and Ireland as Lombardy poplar. [11] 'Manchester' is a cultivar of P. nigra subsp. betulifolia widely planted in northwest England. It is a male clone, and currently seriously threatened by poplar scab disease. [12] [13]
The selection of increasingly fast-growing cultivars has at least halved the revolution in poplar plantations.. Transgenic poplars are being or have been tested, in North America and in France in particular, with poplars intended for energy production and poplars potentially destined for the paper industry, [3] [4] as well as with short rotation coppice or very short rotation coppice, with ...
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 is a genus of 25–30 species of deciduous flowering plants in the family Salicaceae, native to most of the Northern Hemisphere.English names variously applied to different species include poplar (/ ˈ p ɒ p l ər /), aspen, and cottonwood.
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When stocking, a tree's basal area is measured. The basal area is a cross-sectional area of the stump taken about 4.5 feet (1.4 m) above the ground. [7] The equation for calculating the basal area of trees in a stand is Basal Area = 0.005454 DBH 2, where DBH is the diameter of the tree at the aforementioned measuring height. [7]
Agronomic studies often focus on the above-ground part of plant biomass, and consider crop growth rates rather than individual plant growth rates. Nonetheless there is a strong corollary between the two approaches. More specifically, the ULR as discussed above shows up in crop growth analysis as well, as: = . = .
The system of energy forestry has faced criticism over food vs. fuel, whereby it has become financially profitable to replace food crops with energy crops. However, such energy forests do not necessarily compete with food crops for highly productive land as they can be grown on slopes, marginal, or degraded land as well – sometimes even with ...