Forest succession on alluvial landforms of the McKenzie River Valley, Oregon
Document Type: Journal Article
Author(s): G. M. Hawk; D. B. Zobel
Publication Year: 1974

Cataloging Information

  • Abies grandis
  • Alnus rubra
  • Berberis nervosa
  • Cascades Range
  • coniferous forests
  • cover
  • ecosystem dynamics
  • forest management
  • Gaultheria
  • Gaultheria shallon
  • hardwood forests
  • moisture
  • Oregon
  • Oxalis oregana
  • plant communities
  • plant ecology
  • plant nutrients
  • Polystichum munitum
  • Populus trichocarpa
  • Salix
  • sedimentation
  • seedlings
  • shrublands
  • shrubs
  • sloping terrain
  • soil moisture
  • soils
  • statistical analysis
  • succession
  • Thuja plicata
  • Tsuga
  • Tsuga heterophylla
  • vegetation surveys
  • watershed management
  • wetlands
Record Maintained By:
Record Last Modified: June 1, 2018
FRAMES Record Number: 38868
Tall Timbers Record Number: 13487
TTRS Location Status: In-file
TTRS Call Number: Fire File DDW
TTRS Abstract Status: Okay, Fair use, Reproduced by permission

This bibliographic record was either created or modified by the Tall Timbers Research Station and Land Conservancy and is provided without charge to promote research and education in Fire Ecology. The E.V. Komarek Fire Ecology Database is the intellectual property of the Tall Timbers Research Station and Land Conservancy.


Using association tables and a two-dimensional ordination procedure, two topo-edaphic climaxes (associations) have been identified. These are: (1) the Tsuga heterophylla/Po1ystichum mumitum-OxaIis oregana association occurring on terraces with fine, sandy loom to silt loam soils derived from silty river alluvium; and (2) The Tsuga heterophyfla/Berberis nervosa-Gaultheria shallon association occurring on rockier soils with coarser alluvium or glacial outwash. Two early seral associes, each dependent on sedimentation, plus later seral associes, at least one dependent on recent fires, are also identified. A major factor leading to vegetation differences appears to be moisture availability in late summer. (The soils in the Tsuga heterophylla/Berberis nervosa Gaultheria shallon habitat type are shallower, coarser, and rockier than those in the Tsuga heterophvlla/ PoIystichum munitum-0xalis oregana habitat type). This hypothesis is supported by plant moisture stress-measurements on saplings growing in each of the topo.edaphic associations.

Hawk, G. M., and D. B. Zobel. 1974. Forest succession on alluvial landforms of the McKenzie River Valley, Oregon. Northwest Science, v. 48, no. 4, p. 245-265.