Estimating Eladp in the field

If the canopy shows a clear predominance of horizontal or vertical leaves, then choose a small volume of the canopy that is representative. Count the number of leaves that are at more than 45° from the vertical (i.e. mostly horizontal), and the number of leaves that are less than 45° from the vertical. If the leaves are curved, pick the angle at the widest part of the leaf. The ELADP can be estimated as the number of horizontal leaves (Nh) divided by the number of vertical leaves (Nv), multiplied by π /2 (1.6).

ELADP = π N h 2 N v

The factor π /2 comes from the fact that the vertical leaves are distributed about the vertical axis, so for any light ray, some will be seen face-on, and some edge-on. In effect, the ellipsoidal distribution is being further approximated as a cylindrical distribution.

If you set ELADP to 1024, and Absorption to 1.0, the LAI calculations will be equivalent to the simple Beer’s law inversion based on black, horizontal leaves.

Relationship between Mean Leaf Angle and ELADP

Wang & Jarvis (1988) describe the relationship between ELADP and the Mean Leaf Angle, which is sometimes known from other studies. Their results are summarised by the following graph:

	90
	80
	70
	60
degrees	50
degrees
MLA	40
MLA
	30
	20
	10
	0	0.1	1	10	100
	0.01	0.1	1	10	100
			ELADP

SunScan User Manual v 1.05

Measurement options • 45

SS1-UM-1.05 specifications

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Delta Electronics SS1-UM-1.05 user manual Relationship between Mean Leaf Angle and Eladp

Models: SS1-UM-1.05