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New Zealand Journal of Forestry (1985) 30(2): 251–266
©New Zealand Institute of Forestry

Research article
A quantity of forest.

B. J. Allison

A way of measuring forests under even-aged management in terms of an equivalent normal forest, ENF, is described. Uses of the measure are illustrated with reference to yield forecasting and forest reporting.

Growing stocks of possible normal forests, with the area and growth potential of an actual forest, are represented as wedges: rotation along the base, annual yield per hectare on the perpendicular, age class area by the breadth. The apices of these wedges lie along the m.a.i, curve. The one best fitting an actual forest is found by simulation under standard rules. The ENF rotation is essentially twice the average age present in the forest, with allowance for the effect on increment of differences between the present stock and that which will emerge from regeneration.

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