Skip to main content

Population Structure of Forests Over a Large Area

Buy Article:

$29.50 plus tax (Refund Policy)


Forest structure was examined along a wide transect extending from Oklahoma to North Carolina and covering a wide variety of forest types and species. A composite curve produced by all the species included in the sample showed an overall concave form of the semilogarithmic density-diameter curve, with a rotated sigmoid shape at the mid-diameter size-class range. The degree to which individual species exhibited the concave or convex shape was directly related to shade-tolerance capacities of species. Stratification of regional forest stands by diameter class (age) showed the rotated sigmoid shape to exist at the all-species level and for some individual species within the oldest stands. In eastern deciduous forests, rotated sigmoid density-diameter distributions will occur on a regional basis in response to canopy-understory interactions as stand average diameter increases and as the relative importance of shade-tolerant tree species increases. Sigmoid density-diameter distributions in contrast to linear or slightly concave/convex distributions do not necessarily indicate a deviation from the structural development patterns of undisturbed forest stands. However, effects from forest harvesting on regional forest structure cannot be totally discounted as a source of structural variation from a negative exponential pattern. Forest Sci. 27:701-710.

Keywords: Density-diameter distribution; forest structure; shade tolerance

Document Type: Journal Article

Affiliations: Ecologists, Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830

Publication date: December 1, 1981

More about this publication?
  • Membership Information
  • ingentaconnect is not responsible for the content or availability of external websites

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more