Inventories - Forest inventory
9 important questions on Inventories - Forest inventory
Why do a rectangular plot?
- Easy to determine whether trees are in or out
- in rolling terrain can be oriented along slope to capture most variability
What are the problems with rectangular plots?
How do you deal with plots at the stand boundary?
- Move plot so that if falls within the edge
- edge trees will be under sampled
- bias if stand has lots of edges
- mirror excluded area
- place an auxiliary point at the same distance from the edge in the adjacent stand
- count the trees in the overlapping circle segment twice
- edge trees will be oversampled, leading to bias
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What are the principles of the sixth tree method?
- Plot size is variable, and determined by the distance to the center of the 6th tree
- all 5 nearest trees are measured for their DBH
- also called the distance method
What is the best method for basal area and why?
- Circular plots & angle guage have similar low SD, CV, precision & number of plots needed to get a 10% precision.
- precision (with repetitive measures you get similar values)
- accuracy (how close the value that you obtain is from the " real value"). So is this the real value of basal area?
What is the best method for density and why?
Why do you think that a relatively high number of plots is needed to describe the Oostereng area with 10% precision?
What method approaches the “real” forest values best?
What method is the best compromise in terms of precision and time needed?
The question on the page originate from the summary of the following study material:
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