Fig. 7

Influences of aspect and altitude on aboveground carbon density (ACD) of (a) old-growth and (b) secondary forests in the Wellington Region of New Zealand, based on 4.5 million measurements of top-of-the-canopy height made by airborne laser scanning. Mean (± 1 standard error of the mean, as black arrows) are shown, but standard error of the mean are narrower than symbol widths because of high sample size. Note that virtually no secondary forests occur at high altitude