Tree diameter, height and stocking in even-aged forests
Empirical observations suggest that in pure even-aged forests, the mean diameter of forest trees (D, diameter at breast height, 1.3 m above ground) tends to remain a constant proportion of stand height (H, average height of the largest trees in a stand) divided by the logarithm of stand density (N, number of trees per hectare): D = β( H−1.3) / ln ( N).
Thinning causes a relatively small and temporary change in the slope β, the magnitude and duration of which depends on the nature of the thinning.
This relationship may provide a robust predictor of growth in situations where scarce data and resources preclude more sophisticated modelling approaches.
Vanclay, JK 2009, 'Tree diameter, height and stocking in even-aged forests', Annals of Forest Science, vol. 66, no. 7, pp. 702.
The publisher's version of this article is available at http://dx.doi.org/10.1051/forest/2009063