2005 Managing Stand Density Symposium Presentation

March 16, 2005 * Canyonville, Oregon
For diagrams and charts, click here for PowerPoint presentation
SAF: Managing Stand Density

Sample Slides

Slide1: What is Clumpiness?

  1. Clumpiness is a Stand Attribute
  2. Clumpiness is an Index of Spatial Regularity
  3. How to Get There:
    • Phototype the Forest into Stand Polygons
    • Typically by Species, Size & Density
    • Set Minimum Polygon Size (Typically 5-acres)
    • Absorb Small Openings and Thickets (< 5-acres)
    • Clumpiness is the Dispersion within the Polygon
    • Use Cruise Compiler to Compute the Index
    • Load the Index into your Inventory Database

Slide 2: Tree v Plot Attributes

  1. Plot Parameters
    • Site Index
    • Stand Density (SDI, CCF, Rd, Tpa, Basal Area)
    • Clumpiness (spatial pattern)
  2. Species Parameters
    • Genetic growth form, Shade Tolerance
  3. Tree Parameters
    • Species, Dbh, Height, Taper, Age
    • Tree-centered Density (CSI)

Slide 3: Stand Density Indices

  1. Stand Density Index (SDI), Reineke (1933)
    • Assumes Quadratic Mean Dbh
    • Assumes All Trees with Dbh > 0
  2. Relative Density (Rd), Curtis (1982)
    • Assumes Quadratic Mean Dbh
    • Includes Only Trees with Dbh > 0
    • SDI = 5.8 * Rd
  3. Crown Competition Factor, Krajicek etal (1961)
    • Summation of Individual Tree Growing Space
    • Includes All Trees, All Sizes including Dbh = 0
    • CCF = 5.0 * Rd (General Rule of Thumb)

Slide 9: A Tree-Centered Density Index

  1. Competitive Stress Index (CSI), Arney (1973)
    • Uses Same Individual Tree Growing Space Area as CCF
    • Includes All Trees, All Sizes (even Dbh = 0)
    • Competing Trees Overlap into “Subject Tree” Growing Space
    • Primary Sampling Unit is the Individual Tree
    • Provides Distribution of Density across Plot
  2. Plot-Centered Density Index (CCF)
    • Competing Trees Overlap into “Plot” Growing Space
    • Primary Sampling Unit is the Plot
    • Provides only Average Density across Plot

Slide 11: Application of Clumpiness Index

  1. Spatial Variability Index on Research Plot

    • Stem Map Trees on Research Plot
    • Clumpiness = Spatial Variance / Mean Spacing
    • FPS Translates to 0 – 1 Clumpiness Scale
    • Tree Sizes and Spacing determine CSI
  2. Estimate of Density Distribution on Cruise

    • Prism Plots provide Point Estimates of CSI
    • Clumpiness = CSI Variation / Average CSI