Ash Reduction Model (Metric)						2 cm Diameter Class
Version 2.0, Tara L. Eberhart, Andrew J. Storer, Linda M. Nagel
Copyright Michigan Technological University									Version 2.0 Input Requirements
4/24/2007									ASH Trees Only
									Trees per Hectare
									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/Hectare	% Phloem Basal 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 of ash phloem basal area in a stand.
Over 500 ash trees were measured to find the average phloem width and calculated phloem basal area by diameter class.
Phloem is the food source and breeding substrate used by emerald ash borer in ash trees.
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.
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.
Note: basal area reduction will reduce the amount of phloem in the stand by a target level,
thereby reducing the population potential of eab, not ensuring remaining ash to be uninfested.