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White pine inventory dynamics in Minnesota: Review of FIA data

White pine inventory dynamics in Minnesota: Review of FIA data. Alan R. Ek and Grant M. Domke Department of Forest Resources, University of Minnesota. aek@umn.edu January 12, 2009 – Cloquet, MN. Outline. Introduction Type area (timberland) Area by age class Area by ownership

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White pine inventory dynamics in Minnesota: Review of FIA data

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  1. White pine inventory dynamics in Minnesota: Review of FIA data Alan R. Ek and Grant M. Domke Department of Forest Resources, University of Minnesota aek@umn.edu January 12, 2009 – Cloquet, MN

  2. Outline • Introduction • Type area (timberland) • Area by age class • Area by ownership • Species and type associations • Tree numbers • Conclusions

  3. Introduction • WP as major timber species 1860-1920 (peak harvest 1899) • Impacts of fire and land clearing • Restoration problems (Blister rust, deer, etc.) • WP management and markets 1920-1990 • WP restoration efforts 1990+

  4. Type area Original forestland in MN by type1 1Estimates for 1850 from the U.S. Land Office Survey.

  5. Type areaChange in WP type acreage* *For Timberland only from 1936-2008

  6. Type areaInterpretation of inventory data • 19th Century mapping lacks precision and detail for precise interpretation / comparisons • FIA methodology has changed several times since early inventories • WP is small percentage of the forest and thus subject to large sampling error • Type classification system error is also an important factor in precision and interpretation

  7. Type areaChange in pine acreage

  8. Type areaChange in WP acreage

  9. Area by age class WP acreage x age class distribution

  10. Area by age class Acreage x age class distribution - Federal

  11. Area by age class Acreage x age class distribution - State

  12. Area by age class Acreage x age class distribution – Local* * County, etc.

  13. Area by age classAcreage x age class distribution - Private

  14. Area by ownershipPublic vs private timberland 2008

  15. Area by ownershipTimberland acreage by ownership 2008

  16. Species and type associationsWP growing stock volume by type group 2008

  17. Species and type associations Total GS volume (all species) for WP type*

  18. Species and type associations Annual net growth of GS for WP type

  19. Species and type associations Annual GS mortality for WP type

  20. Species and Type Associations WP species harvest 2004-2008 Estimates from Minnesota’s Forest Resources 2004-2008, MN DNR Division of Forestry

  21. Tree numbers FIA Forest plots containing WP - 2008 • 1 in every 16 plots contains a live WP tree • 276 FIA plots…(1 in 16) contain a live WP tree • 6166 FIA plots in total for 2004-2008 period. • Thus 4.5 % of plots have a live WP tree • Given 16,990,266 million acres of Forest, approximately 760,000+ acres have a live WP tree • Note map includes BWCAW plots with WP

  22. Tree NumbersDistribution of WP by Site Index class

  23. Tree NumbersNumber of WP by size class* and region** *Saplings: ≤ 4.9 inches, Poletimber: 5.0 – 8.9 inches, Sawtimber: 9.0+ inches “-” Data not available **Region 1 Aspen - Birch 2 Northern Pine 3 Central Hardwood 4 Prairie

  24. Tree numbersNumber of WP by ownership *Saplings: ≤ 4.9 inches, Poletimber: 5.0 – 8.9 inches, Sawtimber: 9.0+ inches

  25. Tree numbersAnnual WP mortality (Number of trees*) *Poletimber: 5.0 – 8.9 inches, Sawtimber: 9.0+ inches

  26. Conclusions • WP was and remains present in all FIA units • WP type and tree numbers dramatically reduced in extent from early settlement period • WP now concentrated in NC and NE MN • WP tree and type restoration efforts appear to be working but are insufficient to grow the type acreage • Given WP as small percentage of forest, interpret FIA data with caution

  27. Questions?

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