Canopy Gap Fraction
Canopy Gap Fraction - Related Videos
01:37
Gap Junctions
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2026
Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...
01:27
Gap Junctions
0 Views •
2023
The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...
10:09
Fractional Distillation
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2023
Source: Laboratory of Dr. Nicholas Leadbeater — University of Connecticut Distillation is perhaps the most common laboratory technique employed by chemists for the purification of organic liquids. Compounds in a mixture with different boiling points separate into individual components when the mixture is carefully distilled. The two main types of distillation are "simple distillation" and "fractional distillation", and both are widely used in organic chemistry laboratories. Simple distillation...
01:24
Service Gap Model
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2024
Understanding service quality gaps enables companies to make targeted improvements to meet customer needs better. The Knowledge Gap arises when a company needs to understand customer expectations due to inadequate research or communication. For example, a store might assume customers prefer a wide selection of products when they value faster service. Companies should actively gather and respond to customer feedback to close this gap. The Policy Gap occurs when a company's service policies do...
06:28
Field Measurement of Effective Leaf Area Index using Optical Device in Vegetation Canopy
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Cited by 2 •
2021
Fast and precise leaf area index (LAI) estimation in terrestrial ecosystems is crucial for a wide range of ecological studies and calibrating remote sensing products. Presented here is the protocol for using the new LP 110 optical device for taking ground-based in situ LAI measurements.
FAQs
The calculation begins by separating canopy elements from unobstructed sky or other gaps in an image or sensor record. Researchers then determine the proportion of sampled sightlines or image area classified as open. Hemispherical photographs, optical sensors, and lidar can provide these observations, although each records canopy openness through a different measurement approach.
A larger proportion of unobstructed space generally indicates more opportunity for light to pass through the canopy toward the forest floor. Because canopy gap fraction reflects the distribution of foliage and open sightlines, it helps researchers relate canopy structure to light availability, leaf area, and conditions that influence vegetation beneath the canopy.
These approaches obtain canopy-gap information in different ways. Hemispherical photographs record a broad view of canopy and sky, optical sensors sample canopy openness through sensor measurements, and lidar characterizes vegetation structure using remote sensing. The selected method therefore affects how canopy elements and gaps are distinguished and whether measurements describe a local sample or broader spatial pattern.
A typical workflow selects a sampling location, collects observations with hemispherical photography, an optical sensor, or lidar, and distinguishes foliage from open space in the resulting data. The proportion of classified gaps is then calculated from sampled sightlines or area. Researchers can use that value to characterize canopy structure and compare conditions among sites or observations.
Researchers may use the metric when examining ecosystem productivity, plant regeneration, evapotranspiration, biodiversity, or forest disturbance. It provides a structural measurement that can be related to how densely vegetation covers an area and how much open space occurs within the canopy. This makes it useful for connecting vegetation structure with ecological conditions and ecosystem processes.
Remote-sensing measurements, particularly lidar-based observations, allow canopy structure and open space to be assessed beyond individual field locations. By applying measurements across larger areas, researchers can monitor spatial variation in canopy conditions and detect patterns associated with forest disturbance. The resulting landscape-scale information complements detailed observations from photographs or optical sensors.