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Tree Line USA is a program sponsored by the Arbor Day Foundation in cooperation with the National Association of State Foresters which recognizes public and private utilities across the United States that demonstrate best practices that protect and enhance America's urban forests.
Shield of the Programme for the Endorsement of Forest Certification Schemes (PEFC) at Marburg-Schröck, Germany. PEFC International is the only international forest certification scheme that bases its criteria on internationally accepted intergovernmental conventions and guidelines, [5] thereby linking its sustainability benchmark criteria with existing governmental processes.
The following is a partial listing of Tree Cities USA. [1] To be a Tree City, the community must meet four standards set by the National Arbor Day Foundation and the National Association of State Foresters: The community must have a tree board or department. The community must have established a community ordinance for tree care.
An alpine tree line is the highest elevation that sustains trees; higher up it is too cold, or the snow cover lasts for too much of the year, to sustain trees. [ 2 ] : 151 The climate above the tree line of mountains is called an alpine climate , [ 14 ] : 21 and the habitat can be described as the alpine zone . [ 15 ]
ANSI A300 is the tree care industry standard of care in the USA. It was developed by Tree Care Industry Association and maintained by consensus of various industry stakeholders through periodically reviewing and updating the guidelines.
American Forests enlists hundreds of volunteers in the United States to locate, protect, and register the largest trees, and to educate the public about the benefits of mature trees and forests. It is active in all 50 states, the District of Columbia and has been used as a model for many state big tree programs and several international ones ...
Krummholz Pinus albicaulis in Wenatchee National Forest Wind-sculpted krummholz trees, Ona Beach, Oregon. Krummholz (German: krumm, "crooked, bent, twisted" and Holz, "wood") — also called knieholz ("knee timber") — is a type of stunted, deformed vegetation encountered in the subarctic and subalpine tree line landscapes, shaped by continual exposure to fierce, freezing winds.
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