FM Cheat Sheet 2026

The 30 highest-yield FM facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. In a mature, undisturbed forest watershed, what approximate percentage of annual precipitation typically becomes streamflow? → 10–30%
2. Why is soil health important in forest ecosystems? → It supports tree root growth and overall forest health
3. How do forest management regulations support conservation? → By ensuring sustainable management and conservation
4. In forest inventory, 'gross volume' differs from 'net volume' in that: → Gross volume includes all wood, while net volume deducts defects, cull, and waste
5. What does 'rotation age' mean in even-aged forest management? → The number of years from stand establishment to final harvest
6. LiDAR technology in modern forest inventory is primarily used to: → Measure tree heights, canopy cover, and stand structure across large areas from aircraft
7. Which US government program provides cost-share assistance to private landowners who develop forest stewardship plans that may support certification? → USDA Natural Resources Conservation Service (NRCS) through programs like EQIP
8. What is the difference between 'gross increment' and 'net increment' in stand growth accounting? → Gross is total growth; net subtracts mortality and harvest losses
9. A forest manager wants to increase structural complexity. Which management action would be LEAST effective for achieving this goal? → Conducting commercial clearcutting and removing all slash
10. Which of the following practices helps reduce soil compaction during mechanized logging? → Restricting heavy equipment to designated trails
11. What is the main purpose of conducting a 'pre-harvest inventory' on a timber sale area? → To estimate merchantable timber volume and value to set sale terms and reserve prices
12. How does climate change affect forest ecosystems? → It may alter forest composition and increase risks
13. Which tree disease, caused by the pathogen Phytophthora ramorum, has devastated oak and tanoak populations in the western United States? → Sudden Oak Death
14. When designing a stream buffer (riparian management zone), which factor should the forester weigh most heavily in determining buffer width? → Stream classification, slope gradient, and soil erodibility
15. A forester observes heavy elk browse pressure preventing conifer regeneration in a clearcut. This is an example of: → Biotic interference with regeneration
16. Which soil property is the best indicator of compaction risk from heavy logging equipment? → Bulk density
17. Which of the following is the BEST indicator of long-term site productivity for timber in a given forest ecosystem? → Site index (height of dominant trees at a reference age)
18. What is the importance of fire management in forest conservation? → It helps to maintain forest health and reduce wildfire risks
19. Which silvicultural system is most appropriate for managing Ponderosa pine, a shade-intolerant species, in the western US? → Shelterwood or clearcutting variants
20. What is the role of international forest agreements in forest policy? → To foster international cooperation on forest management
21. The 'sampling error' in a timber cruise is important because it tells the manager: → The statistical precision of the volume estimate and confidence in the cruise results
22. Which of the following is a key output of a Geographic Information System (GIS) used in forest planning? → Spatial maps integrating layers such as timber types, soils, streams, and roads
23. Why is ecosystem restoration important for forest protection? → It restores biodiversity and ecosystem functions
24. Which forest planning concept ensures that timber harvests do not exceed the forest's long-term productive capacity? → Sustained yield
25. How does coarse woody debris (CWD) on the forest floor primarily benefit watershed hydrology? → Retains soil moisture and reduces erosion by slowing runoff
26. Which of the following best describes 'provenance' in the context of tree seed selection? → The geographic origin of a seed source
27. Which of the following best describes the role of 'accreditation' in forest certification systems? → The independent oversight process that qualifies certifying bodies to conduct audits
28. Under the National Forest Management Act (NFMA), what is required before a timber sale can be approved on federal land? → Compliance with the Forest Plan and completion of NEPA analysis
29. What is the role of forest certification programs? → To promote sustainable forest management practices
30. What is the ecological concept of 'carrying capacity' as applied to wildlife in a forest ecosystem? → Maximum population size an ecosystem can sustain indefinitely