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FVS Regeneration

Learn about the innovative regeneration imputation methods implemented by the USDA Forest Service. Explore topics such as stand conditions, seedling counts, species composition, and more. Gain insights into the processes involved in regeneration estimation.

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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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