Certified Forester Practice Exam

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How is the average number of trees per acre (TPA) calculated for a specific diameter class?

(# trees tallied) / (total # points)

(# trees tallied) x (per-acre conversion factor) / (total # points)

The average number of trees per acre (TPA) for a specific diameter class is most accurately calculated using the method described in the correct answer. This involves taking the total number of trees that have been tallied within that specific diameter class and then multiplying it by a per-acre conversion factor, which is essential to standardizing the tally in terms of per acre. This product is then divided by the total number of points, ensuring that the calculation accounts for the sampling method used to gather the data.

In forestry, it’s common to use a point sampling method, where various points are surveyed to estimate the density of trees over a larger area. By applying the per-acre conversion factor, one can extrapolate the data collected from the sample points to estimate the average number of trees across a one-acre area. This provides a robust measure of tree density that is useful for forest management and planning.

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(per-acre conversion factor) + (total # points)

(# trees tallied + total # points) / (per-acre conversion factor)

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