Compacted crown ratio

n. Percentage of the tree bole length supporting healthy, live foliage, where openings in the crown are visually adjusted (NRIS FSVEG 2005; Forest Inventory and Analysis 2005) to produce an effective crown ratio as if there were no openings.

 

  • Discussion

 

Crown ratio is the relative amount of the tree bole length supporting green, live, healthy foliage and is expressed as a percentage of the tree’s total height.  When measuring compacted crown ratios, openings in the crown or lopsided crowns are adjusted by visually transferring lower branches to fill in the openings (NRIS FSVEG 2005; Forest Inventory and Analysis 2005) to produce the effective crown ratio as if there were no openings.

 

  • Units

     

    Compacted crown ratio is usually expressed as a decimal fraction. For example, a compacted crown ratio of 0.5 means that half of the crown length, when visually adjusted for crown gaps, supports healthy live foliage.

     

  • See Also

  • References

    • Forest Inventory and Analysis National Core Field Guide. 2005. Volume 1: Field Data Collection Procedures for Phase 2 Plots, Version 3.0, [Online]. Available: http://www.fia.fs.fed.us/library/field-guides-methods-proc/docs/2006/core_ver_3-0_10_2005.pdf.

    • Natural Resource Information System Field Sampled Vegetation (NRIS FSVEG). 2005. Common Stand Exam Users Guide, Version 1.7, [Online]. Available: http://www.fs.fed.us/emc/nris/products/fsveg/index.shtml.

    • Natural Resource Information System Field Sampled Vegetation (NRIS FSVEG). 2005. Data Dictionary, Version 1.7., [Online]. Available; http://www.fs.fed.us/emc/nris/products/fsveg/index.shtml.

     

  • Notes

    • Author 

      Stephanie Rebain, Forester

      Forest Management Service Center