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New Zealand Journal of Forestry (2010) 54(4): 39–42
©New Zealand Institute of Forestry

Professional Paper
Predicting carbon for Douglas-fir

Leith Knowles 1, Mark Kimberley 1, Piers Maclaren* 2 and this paper is dedicated to the late Leith Knowles

1 Scion Research, Private Bag 3020, Rotorua, New Zealand
2 Piers Maclaren and Associates Ltd, 20 Labyrinth Lane, RD 1 Takaka, New Zealand. Corresponding author:
*Corresponding author.

Abstract: A method was developed to estimate the total carbon in live Douglas-fir stands (ie stemwood, bark, crown, and roots). The weight of stemwood was estimated by a pre-existing volumetric model (DFNAT) combined with a measurement of basic density. Bark was estimated as a proportion of stemwood. The weight of the crowns, and the weight of roots, was linked to the oven-dry weight of stemwood plus bark. Elemental carbon was assumed to be half the dry weight. These equations were installed in a pre-existing delivery mechanism (“The Douglas-fir Calculator”) that predicts the physical and financial outcomes from a single hectare of even-aged trees. The equations in this paper are an improvement on previous estimates that had used linear rather than non-linear relationships, as well as an intercept value that gave irrational results for very low levels of stem biomass.
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