Southern
Research Station

• Authors: Cleland, D.T.; Freeouf, J.A.; Keys, J.E.; Nowacki, G.J.; Carpenter, C.A.; McNab, W.H.
• Publication Year: 2007
• Publication Series: General Technical Report (GTR)
• Source: General Technical Report WO-76D

Abstract

This map and accompanying descriptions were developed through participation with numerous individuals from federal and state agencies and non-governmental organizations using criteria defined in the National Hierarchical Framework of Ecological Units. Delineation generally involved the “top-down approach” of subdividing section level units. A “bottom-up approach” was used where landscape level units had been developed. Additional information is available on the process used for delineation of map units. Subsection maps were compiled at scales of 1:500,000 and 1:1,000,000, recompiled and joined at a scale of 1:1,000,000 and presented at a scale of 1:3,500,000.

• Citation: Cleland, D.T.; Freeouf, J.A.; Keys, J.E.; Nowacki, G.J.; Carpenter, C.A.; and McNab, W.H. 2007. Ecological Subregions: Sections and Subsections for the conterminous United States. Gen. Tech. Report WO-76D [Map on CD-ROM] (A.M. Sloan, cartographer). Washington, DC: U.S. Department of Agriculture, Forest Service, presentation scale 1:3,500,000; colored.
• Keywords: ecoregions, ecological zones, map, continental United States
• Posted Date: July 17, 2015
• Modified Date: July 17, 2015

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Publication Notes

• This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
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