Photosynthesis of Vascular Plants
- c:
Q)
LQ)
- -
C
LL
a...
.J:
......
UI
Q)
>
o
Q)
c
Q)
Q)
LQ)
- o
- c
Q)
o LQ)
a...
100
80
60
40
20
A. desertorum
P. spicoto
o ~~ __ ~ __ ~~ __ ~~
100
80
60
40
20
0L-..---L.._.L..---L.._.L.-..--l....---'
100
80
60
40
20
o
12 noon
50° t.4ea 90°
0° 30° 50°
Canopy foliage orientation
425
Fig. 20.10. Percent of green leaves with incident PFD (PFDint) within four ranges «1000,
1000-1400, 1400-1800, and >1800llmolm- 2 s- 1 ) for single tussocks of Agropyron desertorum and Pseudoroegneria spicata as calculated by model simulation for five time
periods. Simulations were conducted with leaf angles in the canopies as measured (Mea)
and set at different leaf angles (0°, 30°, 50°, 90° from horizontal). Light characteristics
within the tussocks were identical at 0800 and 1600h and at 1000 and 1400h. (Ryel et al.
1993)