Ash Reduction Model 2" Diameter Class                                                                      
Version 1.0, Tara L. Eberhart, Andrew J. Storer, Linda M. Nagel  
Copyright Michigan Technological University
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.  
  Retaining Small Trees   Retaining Large Trees  
Version 1.0 Input Requirements   Target Percentages   Target Percentages  
ASH Trees Only   Diameter Limit Cut   Diameter Limit Cut    
Trees per Acre   99%   99%    
  95%   95%    
This information should be available from 90%   90%    
stand and stock tables.   75%   75%    
  2" Size Class Increments    
  DBH Class " No. Trees/Acre % Surface Area Cumulative Surface Area Ascending Cumulative Surface Area Decending slope intercept 95% calc   90%calc   99% calc   75%   50   25   60   slope intercept 95% calc   90%calc   99% calc   75%   50   25   60  
    95%   90%   99%   75%   50%   25%   60%   95%   90%   99%   75%   50%   25%   60%  
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  

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