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An old-growth forest [a] (also referred to as primary forest) is a forest that has developed over a long period of time without disturbance. Due to this, old-growth forests exhibit unique ecological features. [1]
Old-growth forest, a climax forest in the late stages of stand development containing large, old trees and a complex stand structure that has been generally undisturbed by human activities. The definition of an old-growth forest varies from country to country, but most definitions share an.
define mature and old-growth forests on federal lands, complete an inventory and make it publicly available, identify threats to mature and old-growth forests, develop policies to address threats, develop Agency-specific reforestation goals by 2030, develop climate-informed reforestation plan,
Learn the definition and main characteristics of old-growth forests, their role in maintaining ecosystems, the threats they face, and more.
Based on the initial inventory, Forest Service and BLM lands contain roughly 32 million acres of old growth and about 80 million acres of mature forest. Old growth represents 18 percent and mature another 45 percent of all forested land managed by the two agencies.
Although it is challenging to define old growth in a way that incorporates the inherent ecological diversity and variety of perspectives, old growth forests are generally distinguished by old trees, later stages of stand development, and related structural attributes.
The BLM and U.S. Forest Service define old-growth pinyon and juniper woodlands to be 150-250 years old, depending on site productivity, the geographic location and other factors. Some juniper trees can exceed ages of 1,500 years, and pinyon trees more than 900 years.
The oldest are 4,000-5,000 years old. But they aren't as old as clonal organisms like the remarkable Pando, a vast quaking aspen clone that scientists estimate began growing at the end of the last ice age. Image credit: NPS. An old-growth forest is something foresters will say they’ll know when they see it.
There is no single definition for old-growth forests, because that depends on the ecosystem. Bristlecone pines can live 5,000 years. Some other tree species may only live 150 years, but if they...
Old growth forests are characterized by large, mature trees that are reaching their end point of life, oftentimes being 300, 400, even 500 years old, but there's a lot of other ecological characteristics of old growth forests that make them unique and very beneficial for the ecosystem as a whole.