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Following the completion of the 2005 project, Definition and Inventory of Old Growth Forests on DNR-Managed State Lands, we produced two guides for identifying old trees and forests in Washington: Identifying Mature and Old Forests in Western Washington and Identifying Old Trees and Forests in Eastern Washington, both written by Robert Van Pelt, PhD. This is a list of existing old-growth ("virgin") forests, or remnants of forest, of at least 10 acres (4.0 hectares).ecoregion information from "Terrestrial Ecoregions of the World". (NB: The terms "old growth" and "virgin" may have various definitions and meanings throughout the world. See old-growth forest for more information.).
MATURE FORESTS –Continuing the Comeback The tangled canopies and humus-rich soils of a mature forest provide homes to thousands of species, from nesting warblers to elusive martins. Many of these species show a strong preference for the quiet, secluded . The Old-Growth Forest Network is the U.S. national network of protected, native, publicly-accessible mature forests.
As young forests develop, biodiversity can begin to recover if species variety has been retained, either as seeds within the soil or in nearby mature forests. Mature forests in the Discovery Islands • Mature Forests contain mainly coniferous trees, generally more than 60 years of age. Old-growth forests are often biologically diverse, and home to many rare species, threatened species, and endangered species of plants and animals, such as the northern spotted owl, marbled murrelet and fisher, making them ecologically significant. Levels of biodiversity may be higher or lower in old-growth forests compared to that in second-growth forests, depending on specific circumstances.
Mature forests may stop sequestering (keyword:) additional carbon once mature, but up to the point of maturity, they take lots of carbon out of the air and store it, and at the point of maturity, ultimately store the most carbon that they are going to store (i.e., carbon cycles through that semi-closed mature forest system at that point).