Letter from the State Secretary of Security and Justice to asylum seekers State Secretary Dijkhoff (Security and Justice) informs asylum seekers who enter the Netherlands, about what they can expect here. 20-10-2015 | 13:11.
Some aspen colonies become very large with time, spreading about 1 m (3.3 ft) per year, eventually covering many hectares. They are able to survive forest fires, because the roots are below the heat of the fire, with new sprouts growing after the fire burns out. Aspens do not thrive in the shade, and it is difficult for seedlings to grow 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.
Trees are also competing with a stand of grass for water and nutrients. Trees were 10 feet tall (approximately 1 1/2 inches caliper) at establishment. Trees were ranked by their actual growth rate in the first 10 years after planting.Trees rated as fast growing were at least 25 feet tall after 10 years.These included the American Elm (Ulmus americana), Silver Maple (Acer saccharinum), and the Sycamore (Platanus occidentalis). Moderately fast growing trees measured 18 to 25 feet tall.rees were 10 feet tall (approximately 1 1/2 inches caliper) at establishment. Trees were ranked by their actual growth rate in the first 10 years after planting. Trees rated as fast growing were at least 25 feet tall after 10 years.