1 / 88

Implications of Clumpiness on Growth & Yield

Implications of Clumpiness on Growth & Yield. Managing Stand Density Symposium March 16, 2005 Canyonville, Oregon James D. Arney, Ph.D. Forest Biometrics Research Institute Missoula, Montana. What is Clumpiness?. Clumpiness is a Stand Attribute

susan
Download Presentation

Implications of Clumpiness on Growth & Yield

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Implications of Clumpinesson Growth & Yield Managing Stand Density Symposium March 16, 2005 Canyonville, Oregon James D. Arney, Ph.D. Forest Biometrics Research Institute Missoula, Montana

  2. What is Clumpiness? • Clumpiness is a Stand Attribute • Clumpiness is an Index of Spatial Regularity • 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

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

  4. Stand Density Indices • Stand Density Index (SDI), Reineke (1933) • Assumes Quadratic Mean Dbh • Assumes All Trees with Dbh > 0 • Relative Density (Rd), Curtis (1982) • Assumes Quadratic Mean Dbh • Includes Only Trees with Dbh > 0 • SDI = 5.8 * Rd • 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)

  5. Crown Competition Factor • Sum of Crown Areas: • From within-Plot Trees • On Fixed-Area Plot • Divide by Plot Area • Multiply by 100 • CCF scale 100 to 1000+ • Where: • =<100 is Open-grown • >200 crown recession • >300 suppression mortality

  6. A Tree-Centered Density Index • 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 • Plot-Centered Density Index (CCF) • Competing Trees Overlap into “Plot” Growing Space • Primary Sampling Unit is the Plot • Provides only Average Density across Plot

  7. Competitive Stress Index • Sum of Overlap Areas: • From neighboring Trees • On Subject Tree • Divide by Subject Area • Multiply by 100 • CSI scale 100 to 1000+ • Where: • 100 is Open-grown • >200 crown recession • >300 suppression mortality

  8. Application of Clumpiness Index • 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 • Estimate of Density Distribution on Cruise • Prism Plots provide Point Estimates of CSI • Clumpiness = CSI Variation / Average CSI

  9. 25 Year Mortality Storyat Stampede Creek LOGS

  10. 25 Year Mortality Storyat Stampede Creek LOGS

  11. 33 Year Thinning Trialsat OSU Black RockInitial Conditions on Three 1-acre Plots

  12. 33 Year Thinning Trialsat OSU Black Rock

  13. Observed Dbh Growth by CCF

  14. Observed Dbh Growth by CSI

  15. Typical Clumpiness Distributionsin Oregon Forests

  16. Plantation at 0.95 Clumpiness

  17. Natural Stand at 0.85 Clumpiness

More Related