Certified Forester Practice Exam

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What is the purpose of systematic sampling in forest inventory?

To create randomized plots across the land
To construct a grid layout for variance measurement
To quantify the number of tree species
To assess timber quality visually

The correct answer is: To construct a grid layout for variance measurement

Systematic sampling in forest inventory is designed to provide a structured approach to data collection across the landscape, often implemented through a grid layout. This method is significant because it allows for consistent spacing of sample plots, which helps in reducing bias that may come from random placement. By using this systematic approach, forest managers and researchers can effectively measure variance in forest characteristics, such as tree density, growth rates, and species composition, across different areas of the forest. This structured sampling technique facilitates a more accurate and efficient estimation of the overall forest attributes, ensuring that the data collected is both representative and reliable. It is particularly valuable when assessing large and heterogeneous areas, where random sampling might miss or overrepresent certain sections. As a result, systematic sampling directly contributes to understanding ecological patterns and supports informed decision-making regarding forest management and conservation efforts.