Canopy type and BFS practicalities

Canopy type is the next variable to be considered. As a general guide, the above- canopy reference measurements should be made close to, or above, the position of the SunScan probe. Tall canopies will undoubtedly exercise your ingenuity in achieving this! If you want to use the BFS for LAI readings you must be able to see the top of it to set the shade ring correctly.

Canopy	Options	Comments
type
Low	BFS connected, with extension	Best, but long cables need
	cables, if necessary.	management
Low	No BFS	Slower. Needs slow-changing light
		conditions
High	Devise a portable BFS mount. Use	Good when possible. Checking BFS
	extension cables.	shade ring difficult.
High	Use clearings to get out from under	Needs steady light conditions.
	the canopy. (No BFS required)	Clearing light may be partly shaded.
High	Use independent sensor for above	Needs slow-changing light, and
	canopy PAR.	possibly time average readings. LAI
		readings not available.

Canopy type and LAI estimates

Some types of canopy do not conform well to the assumptions about canopy structure used by the SunScan in calculating LAI. The following table will give you an initial idea of whether it is applicable to your canopy. You should read the chapter on the LAI theory for a fuller appreciation of the subject. Some guidance on specifying values for the typical leaf angle (the ELADP parameter) and leaf absorptivity of your canopy comes later in this section.

Canopy type	Comments
Low, uniform (e.g. cereal crops, trial	Good for LAI
plots)
Low, regular but not uniform (e.g.	Absolute LAI dubious. May show valid trends. PAR
row crops)	mapping
Isolated trees or bushes (e.g.	PAR mapping only
orchard trees)
sparse vegetation (e.g. scrub)	PAR mapping only
high, uniform , not clumped (e.g.	In principle good for LAI, but practical difficulties for
some timber plantations)	above-canopy reference
high, clumped vegetation (e.g.	PAR mapping only
natural woodland)

Canopy Sampling volume

It is useful to be aware of the volume of the canopy that the SunScan is "seeing" when calculating LAI, so you can take this into account when planning your sampling scheme.

With the Direct beam, the SunScan only sees the canopy elements along a 1 metre wide sheet between the probe and the sun. With Diffuse light, the SunScan sees a much larger volume, covering a region centred on the probe, extending out approximately as far as the canopy is high, but with the canopy above the probe making the greatest contribution. These two very different sampling volumes are measured in the same proportions as the incident Direct and Diffuse light.

42 • Measurement options

Document code: SS1-UM-1.05

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Delta Electronics SS1-UM-1.05 Canopy type and BFS practicalities, Canopy type and LAI estimates

Models: SS1-UM-1.05