Certified Forester Practice Exam

What is the limiting distance for plot sampling used to determine area?

1. Area is directly proportional to plot size

2. Calculated using the formula A=πr²

3. Determined by dividing 43560 by the plot denominator

4. Is fixed regardless of the tree species

The correct answer is: Determined by dividing 43560 by the plot denominator

The limiting distance for plot sampling used to determine area is determined by dividing 43,560 by the plot denominator. This approach is grounded in the concept of sampling intensity and is essential for calculating the area represented by each plot in a forest stand. A common unit for area in forestry is acres, and since there are 43,560 square feet in one acre, this formula allows foresters to establish how many plots are needed in order to capture a representative sample of the forest stand for analysis. Using this method, the denominator often represents the number of trees, subplots, or sampling units that will adequately cover the area in question. The relationship established through this calculation helps in standardizing practices across various survey conditions, facilitating comparisons and ensuring reliability in the data collected. In contrast, the other provided options do not accurately reflect the process of determining the limiting distance for plot sampling. The first option suggests a direct proportionality that does not incorporate necessary calculations for actual area measurements. The second option describes the area of a circle but does not relate directly to the principles of plot sampling in forestry. Lastly, stating that the limiting distance is fixed regardless of the tree species ignores the variability and ecological considerations that can influence plot placement and size based on the forest type being