Effects of land-cover change on spatial pattern of forest communities in the Southern Appalachian Mountains (USA)

Monica G. Turner, Scott M. Pearson, Paul Bolstad, David N. Wear

Research output: Contribution to journalArticlepeer-review

96 Scopus citations

Abstract

Understanding the implications of past, present and future patterns of human land use for biodiversity and ecosystem function is increasingly important in landscape ecology. We examined effects of land-use change on four major forest communities of the Southern Appalachian Mountains (USA), and addressed two questions: (1) Are forest communities differentially susceptible to loss and fragmentation due to human land use? (2) Which forest communities are most likely to be affected by projected future land cover changes? In four study landscapes, maps of forest cover for four time periods (1950, 1970, 1990, and projections for 2030) were combined with maps of potential forest types to measure changes in the extent and spatial pattern of northern hardwoods, cove hardwoods, mixed hardwoods, and oak-pine. Overall, forest cover increased and forest fragmentation declined in all four study areas between 1950 and 1990. Among forest community types, cove hardwoods and oak-pine communities were most affected by land-cover change. Relative to its potential, cove hardwoods occupied only 30-40% of its potential area in two study landscapes in the 1950s, and oak-pine occupied ∼50% of its potential area; cove hardwoods remained reduced in extent and number of patches in the 1990s. Changes in northern hardwoods, which are restricted to high elevations and occur in small patches, were minimal. Mixed hardwoods were the dominant and most highly connected forest community type, occupying between 47 and 70% of each study area. Projected land-cover changes suggest ongoing reforestation in less populated regions but declining forest cover in rapidly developing areas. Building density in forest habitats also increased during the study period and is projected to increase in the future; cove hardwoods and northern hardwoods may be particularly vulnerable. Although increases in forest cover will provide additional habitat for native species, increases in building density within forests may offset some of these gains. Species-rich cove hardwood communities are likely to be most vulnerable to future land-use change.

Original languageEnglish (US)
Pages (from-to)449-464
Number of pages16
JournalLandscape Ecology
Volume18
Issue number5
DOIs
StatePublished - 2003

Bibliographical note

Funding Information:
We appreciate constructive comments on the manuscript from Jennifer Fraterrigo and Anna Sugden-Newbery, and three anonymous reviewers, and assistance with the graphics from Bill Feeny. Funding for this study was provided by the Long-Term Ecological Research (LTER) Program of the U.S. National Science Foundation (Coweeta LTER site, Grant DEB-9632854).

Keywords

  • Building density
  • Forest communities
  • Land-cover change
  • Land-use change
  • Landscape change
  • Southern appalachians
  • Spatial analysis

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