| Summary: | Knowledge of tree heights is important for classifying sites, projecting growth and yield
and estimating stand volume. Tree height is expensive and time consuming to measure so
samples should be taken in the most efficient way possible. The impact of different sample
designs and sizes on the fitting of height-diameter equations and subsequent prediction of
volume is explored in this thesis. Several different height-diameter equation forms were
compared for estimating height in second growth Douglas-fir. After selecting the best
equation, a variety of simple sampling designs and sizes were compared using this
equation. It was found that a uniform design, which was based on sampling tree height
uniformly from 3 diameter classes, gave good results for height estimation. A “large”
design, which concentrated 50% of its samples in the largest diameter class, gave the best
estimates for tree volume. In plots less than 50 years old, it was found that sampling more
than 16 tree heights produced diminishing benefits in height and volume estimates. === Forestry, Faculty of === Graduate
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