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Cooperative Forest Ecosystem Research
Research Projects

Stand Structure and Biotic Responses to Changes in
Structure of Young Forests of Western Oregon

Primary management activities in young forest stands include thinning and fuels management. Changes in forest structure from these activities can affect plant and animal communities. Although general relationships of structural features to stand density are well-established, the responses of plant and animal species to structural changes have not been quantified. This research is examining some of these relationships for plant and animal species that are of concern to forest managers.

Goals
The two interrelated goals in this theme are:
1.
To understand changes in stand structure that result from management
  2. To understand some of the more important biotic responses to changes in forest structure



Objectives
There are five objectives to be accomplished using both experimental and retrospective approaches.


Objective 1: Evaluate tree establishment and growth, as well as growth and seed production of native shrubs, herbs, and nonvascular plants, in conifer stands.
  Objective 2: Evaluate the structure, composition and development of old-growth forests and explore methods for creating or maintaining similar structures in younger forests.
  Objective 3: Assess the influence of density management and thinning intensity on abundance and reproductive success of diurnal songbirds and small mammals.
  Objective 4: Determine the relationship of coarse wood volume and fuels management with the abundance and survival of forest-floor vertebrates.
  Objective 5: Develop wildlife habitat models based on stand structural characteristics.

Project Studies

1.
Influence of Canopy Type on Biodiversity of Epiphytic Lichens and Bryophytes in Riparian Forests (McCune/Ruchty)
Completion Year: 2000
2. The Ecology of Rare Plants (Tappeiner/Latham)
3. Old-Growth Stand Development (Tappeiner/ Poage/ Sensenig)
Completion Year: 2002
4. Thinning to Increase Vigor of Old-Growth Trees (Tappeiner/Latham)
Completion Year: 2000
5. Bird Response to Thinning (Hayes)
Completion Year: 2001
6. Monitoring Avian Response to Density Management (Edge/Weikel)
Completion Year: 2000
7. Small Mammal Response to Thinning (Hayes/Larson)
Completion Year: 2001
8. Trophic Relations among Birds, Arthropods, and Shrubs (Starkey/Hagar)
Completion Year: 2003
9. Influence of Silviculture and Downed Wood on Small Mammals in the Oregon Coast Range (Hayes/Waldien)
Completion Year: 2005
10. Response of Small Mammals to Fuels Management in Southwest Oregon (Edge/Manning)
Completion Year: 2002
11. Validation of Songbird Habitat Models (Edge/Wilson)
Completion Year: 2001
12. Influences of Post-fire Salvage Logging on Wildlife Populations: The Davis Lake Salvage Study (Hayes/Manning)
13. Response of Birds to Fire Mosaics (Cannon/Hayes)
14. Tree Species Controls on Nutrient Cycling in the Oregon Coast Range (Cross/Perakis)
15. Contrasting Fire Severity between Riparian and Upslope Forests in the Biscuit Fire of Southwestern Oregon (Halofsky/Hibbs)
16. Bureau of Land Management Density Management Study (Cissel/Anderson/
Berryman/Chan/
Olson/Puettmann)
17. Nitrogen Dynamics across Gaps in Young, Thinned Forests of the Density Management Study (Thiel/Perakis)
18. Predicting Post-fire Regeneration Needs: Spatial and Temporal Variation in Natural Regeneration in Southwestern Oregon and Northern California (Shatford/Hibbs)
19. Four Centuries of Soil Carbon and Nitrogen Change after Severe Fire in a Western Cascades Forest Landscape (Giesen/Perakis)
Completion Year: 2006


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