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FVS Regeneration

FVS Regeneration Imputation Don Vandendriesche USDA Forest Service Forest Management Service Center Growth and Yield Group. - Regeneration Imputation. To impute implies the assignment of something to another.

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FVS Regeneration

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  1. FVS Regeneration ImputationDon VandendriescheUSDA Forest ServiceForest Management Service CenterGrowth and Yield Group

  2. - Regeneration Imputation • To impute implies the assignment of something to another. • The process calls for querying existing data sets for representative stand types and tabulating their seedling/sapling component.

  3. - Regeneration Questions •  Relative to stand conditions … • Quantity ~ Seedling Count? • Quality ~ Species Composition?

  4. Regeneration Imputation Methods Colville-Okanogan-Wenatchee National Forests

  5. - Spatial Data: 5.6 million acres

  6. - Inventory Data: CVS

  7. Ground Rules Pattern Revelation Repute the Program Prorating Multipliers West vs. East Topics

  8. Established seedlings generally have an acceptable minimum girth and height that indicates having a root system firmly entrenched in mineral soil. Vegetation states are described as a composite of size and density classes. Size is based on QMD. Density is based on canopy cover. I. Ground Rules

  9. - Ground Rules • Tally 2” saplings • - {1” – 3” diameter, ~ 10’ height} • Bracket Tally by 5” size class • - {0-5”, 5-10”, 10-15”, 15-20”, 20-25”} • Bracket Tally by 30% canopy cover • - {10-40%, 40-70%, 70%+}

  10. II. Pattern Revelation: “½ - Rule”

  11. - Pattern Revelation: “½ - Rule”

  12. III. REPUTE the Program • REPUTE embodies the concept of Regeneration Imputation. • REPUTE reads the ‘Stand Table’ output files from the FVSSTAND program to develop regeneration keyword component files.

  13. Grand fir DIA. CLASS 2. TREES AVG AVG /AC DBH HGT 30.095 1.83 13.6

  14. Natural 0 Parms(GF, & ((30.095*_SAPX)* &

  15. The REPUTE program produces an average representation of the strata. This condition depicts the average size and density class. Proportioning the 2” saplings by size/density class based on shade tolerance renders multiplicative factors that can be used in conjunction with REPUTE. IV. Prorating Multipliers

  16. Colville-Okanogan-Wenatchee Plot Distribution

  17. - Shade Tolerance Mid-Tolerant: Western white pine Douglas-fir Tolerant: Grand fir Subalpine fir Engelmann spruce Pacific silver fir Western Redcedar Intolerant: Western larch Lodgepole pine Ponderosa pine Different species that have a higher tolerance to shade soon become established beneath the pioneers.

  18. - Size Class Multipliers

  19. - Canopy Cover Multipliers

  20. - Trial Results: Intolerants

  21. - Trial Results: Mid Tolerants

  22. - Trial Results: Tolerants

  23. - Trial Results: All Shade Tolerances

  24. V. West vs. East Mark Twain National Forest

  25. - Spatial Data: 1.5 million acres

  26. - Inventory Data: FIA

  27. Mark Twain Plot Distribution

  28. - Pattern Revelation: “½ - Rule”

  29. New Regeneration Paradigm

  30. "move towards a full regeneration establishment model for all variants"

  31. Questions?

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