Claim · model-written summary
Chlorophyll extracts were more practical than solarimeters and pyranometers for inexpensive simultaneous daily light measurements.
- Outcome
- measurements of light sumse0
- Direction
- more practicale0
- Comparator
- solarimeters and pyranometerse0
Pinus
QuercusNot reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll extracts were judged more practical than solarimeters and pyranometers in giving inexpensive simultaneous measurements of light sums over a day in natural vegetation”
e1“under oak and pine 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 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.
- Observation On three of five days, light sums under pine tree canopies alone exceeded those under other canopy combinations.
- Association Seedling species showed random distributions with respect to measured light, except red maple in the pine stand.