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
9/25/2006										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
	22
	24
	26
	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
	44
	46
	48
	50
	52
	54
	56
	58
	Total
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.
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