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Western Journal of Applied Forestry Online Quiz
Derived from the 2012 January Western Journal of Applied Forestry
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The Western Journal of Applied Forestry Quiz is approved for 3.0 continuing forestry education (CFE) credit hours in Category 1-CF by the Society of American Foresters. Successful completion of the self-assessment, defined as a cumulative score of at least 70%, is required to earn CFE credit. CFE approval is valid for one year from the issue date of publication, and participants may submit the quiz at any time during that period.

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1. In their study of stand and tree growth ten years after precommercial thinning, Newton and Cole conclude that:
a) Residual density of spruce after pre-commercial thinning has little effect on diameter growth of spruce.
b) Residual density of spruce is important determinant of level of epicormic sprouting.
c) Residual density of stands affects tendency of hemlock to form stem sprouts.
2. In their study of mesoscale variation in snag and hardwood densities in old-growth forests in western Oregon, Ares et al. found that:
a) The snag diameter distribution in Coast Range stands on southern aspects exhibits the shape of a negative exponential function.
b) Snags in the smaller dbh classes, which likely originated from intermediate and suppressed trees, were more common on northern aspects than on southern aspects in the Coast Range stands.
c) Stands in the Willamette Valley foothills showed distinct patterns in snag diameter class distributions.


3. The results of the Ares et al. study suggest that guidelines on best management practices, including targets for snag and hardwood densities on federal lands in western Oregon:
a) Currently generally reflect densities found at the mesoscale and thus should not be altered.
b) Region-wide targets for snag and hardwood densities should be increased.
c) Guidelines that allow flexibility in target densities for snags and hardwoods depending on aspect and ecological sub-region may better reflect historical old-growth conditions.
4. What effect did Ritchie et al. find that increasing density generally tends to display with regard to top-height in ponderosa pine?
a) Decreased top height.
b) Increased top height.
c) No significant difference.


5. In comparing two ponderosa pine stands with the same estimated site index, one with density management and one without, Ritchie et al. conclude that:
a) The unmanaged stand will have the greater capacity for productivity as indexed by height, since site index is effectively underestimated in the unmanaged stand.
b) It is possible to underestimate the value of managed stands as the true potential site index may be higher than that observed.
c) If site index is being used to drive growth models it may lead to overestimated height growth and volume response to density management.


6. Relatively long-term experimental results support the concept that inoculum removal will reduce Armillaria root disease levels. However in their analysis of the 35-year study results, Shaw et al. posit that:
a) The particularly large and virulent genet of A. ostoyae will eventually consume all Ponderosa pine in the region.
b) Foresters must immediately begin growing species less vulnerable to Armillaria infection.
c) The type of treatment necessary to implement to provide meaningful reductions in disease losses and gains in crop-tree stocking, do not seem to warrant their cost.
7. The literature review supporting the study of Filipescu et al. mentions the use of non-linear mixed-effects models. Such models have the advantage of:
a) Using a mixture of estimation algorithms.
b) Allowing for better prediction and local calibration.
c) Providing quick solutions for parameter estimates.


8. . In their case study Filipescu et al. found that combining height with crown area resulted in models with more accurate predictions, while the addition of crown area of larger trees:
a) Further improved predictions.
b) Increased the prediction error.
c) Had no influence on the accuracy of predictions.
9. In their study of mastication and prescribed fire influences, Reiner et al. found that two years post-treatment, tree mortality was:
a) 35% lower in masticated/pull-back/fire plots than in plots where fuels were not pulled back.
b) 50% lower in masticated/pull-back/fire plots than in plots where fuels were not pulled back.
c) 65% lower in masticated/pull-back/fire plots than in plots where fuels were not pulled back.


10. In their discussion, Reiner et al. suggest the decision to use mastication-only treatments should be made considering the trade-offs between:
a) The benefits of reduced crown fire potential gained from mastication treatments and potentially greater surface fire behavior in untreated stands.
b) Low potential fire behavior immediately after treatment versus the expense of treatment.
c) Moderately high potential fire behavior immediately after treatment and the possibility of lower potential fire behavior in future years.