Ash Reduction Model 2" Diameter Class

Version 1.1a, Tara L. Eberhart, Andrew J. Storer, Linda M. Nagel

Copyright Michigan Technological University

Version 1.1a Input Requirements

9/25/2006

ASH Trees Only

Trees per Acre

This information should be available from stand and stock tables.

2" Size Class Increments

DBH Class "

No. Trees/Acre

% Surface Area

2

Retaining Small Trees

4

Target Percentages

6

Diameter Limit Cut

8

99%

10

95%

12

90%

14

75%

16

*Cutting all ash down to this size limit

18

20

22

Total

Retaining Large Trees

Target Percentages

Diameter Limit Cut

99%

95%

90%

75%

* Cutting all ash up to this size limit

Summary

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.

The bottom table of Retaining Large Trees is calculated from the same graph as the top table, with the percent axis reversed.

580 ash tree's have had their specific morphology recorded to estimate total surface area which is a good indicator of total phloem available to emerald ash borer.

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