Abstract
Abstract Two approaches to estimating surface area of conifer needles were evaluated: an optical projection technique (optical planimeter) focusing light through a plane surface to a photocell, and covering the needle surface with an adhesive and a monolayer of glass beads and measuring weight increase. On 20 clusters of Douglas-fir foliage, the optical planimeter was more precise (95 percent confidence interval 0.6 cm² compared to 2.0 cm²), but the glass-bead method was judged slightly more accurate. However, a needle cross-sectional correction factor introduced to optical planimeter results improved accuracy. Forest Sci. 21:231-232.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
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Claims 3
Claim · model-written summary
The optical planimeter was more precise than the glass-bead method for Douglas-fir needles.
- Taxon
- Douglas-fir
Pseudotsuga menziesiie0 - Organ / stage
- foliagee0
- Outcome
- more precisee0
- Direction
- more precisee0
- Value
- 0.6 cm²e0
- Qualifier
- 2.0 cm²e0
- Comparator
- glass-bead methode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On 20 clusters of Douglas-fir foliage, the optical planimeter was more precise (95 percent confidence interval 0.6 cm² compared to 2.0 cm²), but the glass-bead method was judged slightly more accurate.”
Claim · model-written summary
The glass-bead method was judged slightly more accurate.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Outcome
- slightly more accuratee0
- Direction
- more accuratee0
- Comparator
- optical planimetere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On 20 clusters of Douglas-fir foliage, the optical planimeter was more precise (95 percent confidence interval 0.6 cm² compared to 2.0 cm²), but the glass-bead method was judged slightly more accurate.”
Claim · model-written summary
A needle cross-sectional correction improved optical planimeter accuracy.
Verbatim
e0“a needle cross-sectional correction factor introduced to optical planimeter results improved accuracy.”
t0“Conifer Needles”