Choose from these Leaf Area Index application videos to view demonstrations of the LAI-2200C in action.
The technology of the LAI‑2200C Plant Canopy Analyzer is used in a wide range of applications, including studies of canopy growth, canopy productivity, forest vigor, canopy fuel load, air pollution deposition modeling, insect defoliation studies and remote sensing.
LAI is also one of the fundamental measurements associated with carbon flux studies and global carbon cycle research. The technology of the LAI‑2200C and its predecessor, the LAI‑2000, is the most commonly used indirect LAI measurement technology worldwide.
Grasslands are among the easiest canopy types to measure with the LAI‑2200C. This video provides a brief description of sampling considerations when estimating grassland Leaf Area Index with the LAI‑2200C.
- Low profile for short vegetation. With methods using a hemispherical camera, a large viewing lens may stick up above the leaves and not be able to see all of the vegetation.
Forest canopies can be measured in two ways: single sensor mode or two sensor mode. This video introduces both methods and describes a few things to consider when measuring forest canopies.
- Fully accurate and functional for tall forest canopies. When Ceptometry is used in tall canopies, it is not possible to use the sun-fleck or gap-fraction mode because there are no distinct shadows and sun-flecks. The shadows are blurred because of the penumbra effect.
- Detector restricted to the blue part of the spectrum (< 490 nm) where leaves have low transmittance. Transmittances measured with Ceptometry will underestimate LAI because leaves are not black in the PAR part of the spectrum.
Row crops are not randomly distributed in space, but a simple modified sampling strategy can be used to ensure that LAI is estimated accurately.
- Measures small plots simply and easily by restricting the canopy view in terms of both azimuth and zenith angles. With Ceptometry, it is not possible to restrict either the azimuth or the zenith view angle. Therefore it may be impossible to use this method to determine LAI of small plots or to use it under cloudy conditions. Use the same view cap and orient the sensor in the same compass direction for all associated above and below readings.
Foliage density (rather than LAI) is the result when measuring an isolated tree canopy. Typically measurements are taken around the tree trunk in each cardinal direction.
- Accurate results under almost all sky conditions. Isolated trees cannot be measured with the Ceptometry method in either sunny or cloudy conditions. Under sunny conditions, sun-flecks are not distinct for trees taller than a few meters. Also it may be impractical to wait for the sun angle to change to get measurements at multiple angles. Under cloudy conditions, gap fraction cannot be determined with Ceptometry because neither the azimuth nor the zenith view angle can be restricted.
A single optical sensor and control unit will work well for this measurement.
- Measures small plots simply and easily by restricting the canopy view in terms of both azimuth and zenith angles. With Ceptometry, it is not possible to restrict either the azimuth or the zenith view angle. Therefore it may be impossible to use this method to determine LAI of hedges or to use it under cloudy conditions. Also, generic crop coefficients cannot be used to estimate leaf area since the path length through a hedge is not a constant.
Interested in other uses for Leaf Area Index?
Read more in the following LI-COR Application Pages that relate to the LAI‑2200C: