Agriculture Reference
In-Depth Information
60
50
40
30
emergent
20
floating
10
0
MAY
JUN
JUL
Date of leaf birth
AUG
SEP
OCT
1987
Fig. 5.4
Longevity of floating (
open circles
) and emergent leaves (
closed circles
) in
Nelumbo
nucifera
, an aquatic macrophyte that produces floating leaves throughout the season and emergent
leaves held on sturdy petioles later in the season. Leaf longevity of emergent leaves is significantly
longer than that of floating leaves. (From Tsuchiya and Nohara 1989)
days (Tsuchiya and Nohara 1989; Fig.
5.4
). Leaf longevities of submerged plants
are longer than those of floating-leaved aquatic plants and are comparable to those
of herbaceous land plants. Leaf longevity ranged from 40 days for
Potamogeton
crispus
to 100 days for
Myriophyllum spicatum
(Yamamoto 1994). The leaf lon-
gevities of marine seagrasses are comparable, averaging 70 days and typically
ranging from 25 to 170 days (Hemminga et al. 1999; Kamermans et al. 2001).
