300, 600 and 900 ppm Increases in the Air's CO2 Concentration:
For a more detailed description of this table, click here.
Hedera helix L. [English Ivy]
|
300 ppm
|
600 ppm
|
900 ppm
|
|
| Number of Results |
3
|
4
|
2
|
| Arithmetic Mean |
66%
|
29.8%
|
25%
|
| Standard Error |
10.6%
|
2.4
|
7.8%
|
|
Experimental Conditions
|
300 ppm
|
600 ppm
|
900 ppm
|
|
|
Hattenschwiler and Korner (2003) |
Plants grown from seed for three years beneath the canopy of the 120-year-old Hofstetten Experimental Forest near Basel, Switzerland, in open-top chambers exposed to light of approximately 2.2% the intensity of full sunlight
|
78%
|
|
|
|
Li et al. (2000) |
growth chambers, fully green variety
|
|
|
14%
|
|
Li et al. (2000) |
growth chambers, variegated variety
|
|
|
36%
|
|
Mortensen (1984) |
growth chambers
|
|
24% |
|
|
Mortensen (1984) |
growth chambers
|
|
26% |
|
|
Mortensen (1985) |
pots (11-cm)
|
|
34% |
|
|
Mortensen (1985) |
pots (11-cm)
|
|
35% |
|
|
Zotz et al. (2006) |
Plants studied for one full growing season under normal conditions in a diverse mixed forest near Basel, Switzerland, in the deep shade of the forest understory
|
80%
|
|
|
|
Zotz et al. (2006) |
Plants studied for one full growing season under normal conditions in a diverse mixed forest near Basel, Switzerland, in the higher light regime of the forest's subcanopy 20-25 meters above the ground
|
40%
|
|
|