Intro Lectures Flashcards
What would create worse bias… Bad sample selection or poor quality data collection?
Poor sample selection creates a bias that is impossible to correct.
Poor data collection can be corrected for.
What is meant by the term “asymptotically unbiased”
The bias decreases towards zero as the sample size becomes larger
What causes bias?
Poor measurements
Bad sample selection
Incorrect estimation procedure
What does benchmark refer to?
What are some standard benchmarks?
An allowance for some timber left on site without penalty.
- Immature Stands: 10m3/ha
- Mature Stands: 25m3/ha
How is R and W measured?
R and W surveys (2 types)
1.Plots
- Occular Estimates
- Only where evidence indicates that the benchmark volume will not be exceeded.
What does TMS stand for?
Timber Merchantability Specifications
What does R and W encompass?
The timber volume debris left on site after harvesting
Why is measuring R and W important to the crown?
- so that the crown can gain revenue off of avoidable waste that is not removed.
- for cut control (inventory and AAC)
- to monitor companies adherence to close utilization standards
What are Intermediate Utilization Standards? What are they used for and when were they used?
Intermediate Utilization were standards used to calculate AAC before 1966. The specifications were that harvested trees had to have…
- Stumps less than 45cm
- Top DIB 20cm max
- DBH 33cm minimum
What does Close Utilization refer to? What are the specs?
After 1966, close utilization standards were introduced and used to calculate AAC in order to reduce waste. The specs are that harvested trees must have…
- Logs > 3m long
- Stumps less than 30 cm
- Top DIB max 15cm mature, 10cm immature
- DBH minimum 17.5cm mature, 12cm immature
What was a result of the implementation of close utilization standards?
- Smaller trees utilizes
- Better utilization of larger trees (less waste)
- More wood in inventory allows for a higher AAC.
What differentiates residue from waste?
Residue
- Greater than minimum size requirement in inventory
- Less than minimum grade requirement in the CP
Waste
- Greater than the minimum size and grade requirement in the CP
What kind of wood would you expect to be classified as residue?
- Y Grade logs
- Forked logs
- Crooked logs
What are some environmental constraints that could classify waste as unavoidable?
- Removal would cause excessive site or soil degradation
- Approved high stumps due to snowpack
- Stub trees to be used for biodiversity purposes
Who carries out vegetation resource inventory?
What is it designed to do?
- Carried out by FLNRO forest analysis and inventory branch
- designed to locate resource and analyze how much of a given resource is within an inventory unit.
