Light Interception Measurement
Light Interception Measurement - Related Videos
08:32
PARbars: Cheap, Easy to Build Ceptometers for Continuous Measurement of Light Interception in Plant Canopies
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Cited by 3 •
2019
Here, we present detailed instructions on how to build and calibrate research quality ceptometers (light sensors that integrate light intensity across many sensors arrayed linearly along a horizontal bar).
12:40
Preparation and Pathogen Inactivation of Double Dose Buffy Coat Platelet Products using the INTERCEPT Blood System
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Cited by 4 •
2012
This article describes the process used by Örebro University Hospital to produce double dose buffy coat platelet concentrates prepared from whole blood donations and treated with the INTERCEPT Blood System for pathogen inactivation. The in vitro quality of the final platelet units are evaluated over 7 days of storage.
06:19
Low-Cost Automated Flight Intercept Trap for the Temporal Sub-Sampling of Flying Insects Attracted to Artificial Light at Night
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Cited by 1 •
2021
To study the impacts of artificial light at night (ALAN) on nocturnal flying insects, sampling needs to be confined to nighttime. The protocol describes a low-cost automated flight intercept trap that allows researchers to sample at user-defined periods with increased replication.
05:50
Measuring Light-Switching Behavior Using an Occupancy and Light Data Logger
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Cited by 4 •
2020
This article describes a procedure for using and deploying an occupancy and light data logger which allows collecting data about light-switching behavior of participants in field settings.
09:39
A Behavioral Assay to Measure Responsiveness of Zebrafish to Changes in Light Intensities
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Cited by 222 •
2008
We developed the Visual-Motor Response to quantitate the motor output of larval zebrafish in response to light increments and decrements. We also examined zebrafish vision mutants, including the no optokinetic response (nrc) mutants, which were thought to be completely blind when tested by another vision assay, the optokinetic reflex.
FAQs
The method compares photosynthetically active radiation above a canopy with the radiation that remains beneath it. The difference represents the portion removed from the incoming light as it passes through the vegetation, while the transmission fraction expresses how much continues downward. This comparison links canopy light capture to the radiation potentially available for photosynthesis.
Photosynthetically active radiation, or PAR, identifies the part of incoming radiation relevant to photosynthetic activity. Measuring PAR above and below vegetation therefore provides a more functionally meaningful estimate of canopy light conditions than treating all incoming radiation alike. The resulting values help connect canopy structure with potential photosynthetic performance and ecosystem productivity.
Canopy structure and leaf area strongly influence how much radiation is removed before it reaches the lower canopy. A denser or more extensive leaf arrangement can alter the balance between above-canopy and beneath-canopy PAR. These measurements consequently provide information about vegetation development and help reveal structural differences among crops, habitats, or management systems.
Shading and seasonal conditions can change the radiation available to, and transmitted through, a canopy. Measurements should therefore be interpreted under defined conditions rather than treated as fixed properties of the vegetation. Comparing results across these conditions can reveal environmental responses and show how vegetation performance changes as light conditions vary.
A basic workflow measures PAR above the canopy and then beneath the canopy under defined conditions. Researchers compare the paired readings to calculate either the difference in radiation or a transmission fraction. Repeating this comparison across vegetation types, growth stages, or environmental conditions produces data suitable for examining canopy development and light-related responses.
Researchers apply the method to assess canopy structure, leaf area, crop growth, plant competition, and responses to shading or seasonal change. In environmental studies, the measurements support comparisons of vegetation performance across habitats or management systems. They also provide inputs for models that estimate carbon gain and broader ecosystem productivity from canopy light conditions.