Claim · model-written summary
On three of five days, light sums under pine tree canopies alone exceeded those under other canopy combinations.
- Outcome
- light sumse0
- Direction
- highere0
- Qualifier
- On three of the five dayse0
- Comparator
- other combinations of tree, sapling, and large seedling canopiese0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentSettingValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Verbatim
e0“On three of the five days, light sums at points under pine tree canopies alone were significantly higher than those at points under other combinations of tree, sapling, and large seedling canopies”
Title
Measurement of Solar Radiation Under Forest Canopies by Use of Chlorophyll Extracts
Frederick R. Swan; Helmut Lieth Journal of Biogeography 1976. doi:10.2307/3038014
Other claims from this paper (10)
- Method / resource Chlorophyll extracts allowed many simultaneous radiation measurements at heights up to 4-5 m.
- Method / resource Chlorophyll extracts were more practical than solarimeters and pyranometers for inexpensive simultaneous daily light measurements.
- Method / resource Chlorophyll extracts gave less reproducible results than solarimeters and pyranometers.
- Association Daily absorbance changes of chlorophyll extracts had a linear relation with pyrheliometer light sums.
- Observation Oak-stand transmittance was reported as 590% less than pine-stand transmittance.
- Observation Oak-stand basal area was 150% greater than pine-stand basal area.
- Observation Daily average light sums in pine stands were 33-509 % greater than in oak stands.
- Observation Seedlings, mostly hardwoods, were twice as dense in pine stands as in oak stands.
- Observation The average range of daily light sums was 2 6 times greater in pine stands.
- Association Seedling species showed random distributions with respect to measured light, except red maple in the pine stand.