Measurement options

Experiment design

This section discusses the factors that bear on the experimental objectives you wish to achieve. It should help you answer questions like:

•What equipment do I need?

•What readings must be taken?

•Will I have to wait for particular times of day or weather conditions?

The type of study you propose to do will determine the time of year and duration of the experiment, and whether you are interested, for example, in monitoring growth by interception of solar radiation, or perhaps in the canopy structure as well.

Some canopies types (the non-uniform ones) preclude the use of the SunScan’s direct LAI readout. You could, however, characterise the 3-dimensional light distribution within your canopy at different heights, or along transects through it. For brevity we will call this approach “PAR mapping” in the discussion below

Answers to the above questions are complicated, but the following tables should give you a good appreciation of the main issues involved.

Above-canopy reference requirements

This refers to measurements of PAR incident on the canopy, made at the same time as the below-canopy measurements. The question is whether to use a BFS.

Beam Fraction sensor

A BFS connected to the SunScan probe provides the best option, because you can operate with fewest restrictions. However, with some canopy types this may not be practical.

The next best option is to use the SunScan probe (without the BFS) sequentially above and below the canopy, but you may be restricted to times when the light levels are not changing fast.

Independent PAR sensor

If that method is not practical either, you may have to rely on independent records of incident PAR from a separate sensor. In addition to slowly changing light levels, you may also have to average measurements in each place over periods of a few minutes, furthermore the direct LAI readout is not available. This is the least convenient situation, and it will not always be considered in the analysis below.

You cannot currently use the SunData software to merge independent records of transmitted PAR and incident PAR to get LAI.

Direct and Diffuse components

Assuming that you make your above-canopy measurements on the SunScan (with or without a BFS), then the next table summarises whether you need to measure the Direct and Diffuse components of the incident light. If you do not need the separate components, you benefit because the BFS is quicker to set up (there is no need to re- adjust its shade ring, once it has been set up correctly).

Type of study

Incident PAR

Incident PAR

 

Total only

Direct & Diffuse components

Fractional interception

Yes

No

LAI

No

Yes

PAR mapping

Yes

Possibly

SunScan User Manual v 1.05

Measurement options • 41

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Delta Electronics SS1-UM-1.05 user manual Measurement options, Experiment design, Above-canopy reference requirements
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SS1-UM-1.05 specifications

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