Uncompacted crown ratio

n. Percentage of the tree bole length supporting green, live, healthy foliage, where openings in the crown are not visually adjusted (NRIS FSVEG 2005; Forest Inventory and Analysis 2005).

 

  • 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.  Some tree crowns are lopsided or exhibit openings or gaps within the live crown. When measuring uncompacted crown ratios, those openings in the crown are not visually adjusted by visually transferring lower branches to fill in the holes (NRIS FSVEG 2005; Forest Inventory and Analysis 2005). Correlations can be used to estimate uncompacted crown ratio if compacted crown ratio has already been measured. Uncompacted crown ratio is always greater than or equal to compacted crown ratio.

 

  • Units

     

    Crown ratio is a dimensionless ratio expressed as a decimal fraction.

     

  • 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