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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. - PowerPoint PPT Presentation
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Natural Variability as a Natural Variability as a Management ParadigmManagement Paradigm
Paleo-Landscape Ecology: Paleo-Landscape Ecology: Reconstructing the Spatial Reconstructing the Spatial and Temporal Dynamics of and Temporal Dynamics of Pacific Northwest ForestsPacific Northwest Forests
Natural Resources Management ParadigmsNatural Resources Management Paradigms
Commodity Production
Species Preservation
Natural Variability
Commodity ProductionCommodity Production
Maximize the production of one or Maximize the production of one or more commoditiesmore commodities
Minimize impacts on other resourcesMinimize impacts on other resources
Species PreservationSpecies Preservation
“…“…maintain viable populations of all maintain viable populations of all native and desirable non-native native and desirable non-native species well distributed throughout species well distributed throughout their range.” (NFMA)their range.” (NFMA)
Economic and social consequences Economic and social consequences are secondaryare secondary
Essentially, this represents reversal Essentially, this represents reversal of priorities of Commodity Production of priorities of Commodity Production ParadigmParadigm
Natural Variability: The Natural Variability: The Precautionary Principle of Precautionary Principle of Ecosystem ManagementEcosystem Management
Describe the range of stand and Describe the range of stand and landscape-level conditions that existed in landscape-level conditions that existed in these forests prior to Euro-American these forests prior to Euro-American settlementsettlement
Design management plans that maintain Design management plans that maintain the system somewhere within this rangethe system somewhere within this range
Natural Resources Management ParadigmsNatural Resources Management Paradigms
Commodity Production
Species Preservation
Natural Variability
1950’s
1980’s
1990’s
“Old” Forestry: circa 1950’s – 1980’s
“New” Forestry: circa mid 1990’s
Return Interval
Swanson et al. 1993
Implementing the Natural Implementing the Natural Variability ConceptVariability Concept
How do you quantify How do you quantify ““The Range of Natural The Range of Natural
Variability”Variability”
Reconstructing Fire History
Number of firesNumber of fires
Fire Frequency and SizeFire Frequency and Size
Fire vs. Timber Harvest: Impact on Fire vs. Timber Harvest: Impact on disturbance ratedisturbance rate
100 yr disp rotation
100 yr disp rotation
50 yr agg rotation
50 yr agg rotation
50 and 100 yr rotations
50 and 100 yr rotations