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Natural Variability as a Management Paradigm

Natural Variability as a Management Paradigm. Paleo-Landscape Ecology: Reconstructing the Spatial and Temporal Dynamics of Pacific Northwest Forests. Natural Resources Management Paradigms. Commodity Production. Species Preservation. Natural Variability. Commodity Production.

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Natural Variability as a Management Paradigm

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  1. Natural Variability as a Management Paradigm Paleo-Landscape Ecology: Reconstructing the Spatial and Temporal Dynamics of Pacific Northwest Forests

  2. Natural Resources Management Paradigms Commodity Production Species Preservation Natural Variability

  3. Commodity Production • Maximize the production of one or more commodities • Minimize impacts on other resources

  4. Species Preservation • “…maintain viable populations of all native and desirable non-native species well distributed throughout their range.” (NFMA) • Economic and social consequences are secondary • Essentially, this represents reversal of priorities of Commodity Production Paradigm

  5. Natural Variability: The Precautionary Principle of Ecosystem Management • Describe the range of stand and landscape-level conditions that existed in these forests prior to Euro-American settlement • Design management plans that maintain the system somewhere within this range

  6. Natural Resources Management Paradigms Commodity Production 1950’s 1980’s 1990’s Species Preservation Natural Variability

  7. “New” Forestry: circa mid 1990’s “Old” Forestry: circa 1950’s – 1980’s

  8. Return Interval Swanson et al. 1993

  9. Implementing the Natural Variability Concept How do you quantify “The Range of Natural Variability”

  10. Reconstructing Fire History

  11. Number of fires

  12. Fire Frequency and Size

  13. Fire vs. Timber Harvest: Impact on disturbance rate

  14. 100 yr disp rotation 50 yr agg rotation 100 yr disp rotation 50 yr agg rotation

  15. 50 and 100 yr rotations 50 and 100 yr rotations

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