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Cooperative Forest Ecosystem Research
Environmental Controls on Woody Plant Diversity in Western Oregon Riparian Forests
Primary Researchers: David E. Hibbs and Daniel Sarr
The Northwest Forest Plan recognizes riparian reserves as critical habitat areas of regional forests. Although it is clear that riparian corridors are ecologically important, relatively little research has been conducted to comparatively evaluate riparian corridors. Research is needed to quantify the key processes that control the development of geomorphic and vegetation diversity in western Oregon riparian forests, how these processes vary across the region, and how they can be expected to respond to management. The purpose of this study is to evaluate atmospheric, physical, and biological characteristics and processes of riparian forests in four physiographic subregions of western Oregon: the central Coast Range, the central western Cascades, the southwestern Cascades, and the eastern Siskiyou Mountains. This research will center on several fundamental questions:

What are key gradients, processes, and environmental controls underscoring woody plant diversity and distribution of native trees in riparian corridors of western Oregon?
  How do factors affecting woody plant diversity shift in importance in different environmental settings? Do important functional relationships change?
  To what degree can effects of disturbance and environmental heterogeneity on woody plant diversity be separated?
  Are factors affecting woody plant diversity patterns arranged hierarchically?

For additional information about this research study see the 2003 CFER Annual Report. (2.2 MB)

All objectives of this study have been accomplished. A dissertation titled "Multiscale Controls on Woody Riparian Vegetation: Distribution, Diversity, and Tree Regeneration in Four Western Oregon Watersheds" (Sarr 2004) has been completed and is on file with the CFER program office.


  


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