Table 13.1.
Temperature thresholds ("C)
for apparent CO2 uptake and survival limits of terrestrial vascular plants during the growing season.
Average ranges, based on data of numerous authors
Plant group
Cold injury
(LTjY
Woody plants
Tropical and humid-subtropical trees
-2 to +5
Sclerophyll trees and shrubs of
-5 to-2
semiarid and arid regions
Deciduous broadleaved trees of
ca. -2
temperate zones
Evergreen conifers of cool temperate
-5 to-3
regions
Dwarf shrubs of heathlands and
-5 to-3
tundra
Herbaceous plants
C4-Grasses
ca. 0
C3-Crop plants
-1 to -3
CAM plants (at night)
-3 to-5
Winter annual desert plants
-5 toO
High mountain plants
ca. -5
aTemperature at which initial necrotic damage occurs.
b 50% of maximum net photosynthesis.
Cold limit
for
CO2 uptake
Oto +5
-5to 0
ca. -2
-5 to-3
-5 to-3
Oto +5
-1 to -3
Oto -3
ca. -5
Photosynthetic thermal
Heat limit for
Heat injury
window
CO2 uptake
(LTj)a
Low
Asob
High Asob
10-15
ca. 40
45-50
50-55
15-20
40-45
45-50
50-60
8-10
ca. 35
40-45
ca. 50
ca. 5
ca. 30
35-42
45-50
5-10
ca. 35
40-45
45-50
15-20
35-45
50-60
60-65
5-15
35-40
45-50
45-55
5-10
20-25
ca. 35
60-65
10-15
ca. 40
45-55
50-60
0-5
ca. 25
38-42
45-55
tv
a~
~
~
g.
~