Ash Reduction Model (Metric) 2 cm Diameter Class                
Version 1.1b, Tara L. Eberhart, Andrew J. Storer, Linda M. Nagel  
Copyright Michigan Technological University   Version 1.1b Input Requirements  
  ASH Trees Only  
    Trees per Acre  
    This information should be available from stand and stock tables.  
  Note: this model version is in METRIC units  
  2cm Size Class Increments    
  DBH Class cm No. Trees/Acre % Surface Area                
  6         Retaining Small Trees  
  8     Target Percentages    
  10           Diameter Limit Cut    
  12           99%    
  14           95%    
  16           90%    
  18           75%    
  20           *Cutting all ash down to this size limit  
  28     Retaining Large Trees    
  30       Target Percentages    
  32     Diameter Limit Cut    
  34     99%      
  36     95%      
  38     90%      
  40     75%      
  42     * Cutting all ash up to this size limit  
This version of the model serves to show what diameter limit cut would be needed in order to reduce the total surface area of ash trees in a stand by a desired amount.  
Over 500 ash trees have had their specific morphology recorded to estimate total surface area which is a good indicator of total phloem available to emerald ash borer.  
Ash species, growing conditions, and phloem widths will be incorporated in future models.  
This model only works with the ash component of a stand regardless of total stand size, other tree species presence, or how much ash there is present.  
Depending on management goals, this model can be used to determine a lower diameter limit cut to retain small trees,  
and an upper diameter limit cut to retain large trees. Surface area can be used as an estimate of phloem, a critical resource, available to  
emerald ash borer in a stand. Use of this model in management decisions will reduce the ash resource available to emerald ash borer  
by a target percentage and help maintain ash as a component in our forests and its genetic diversity  
Note: surface area reduction will reduce the amount of breeding substrate (phloem) in the stand by a target level,  
thereby reducing the population potential of eab, not ensuring remaining ash to be uninfested  

Powered By SpreadsheetConverter