300, 600 and 900 ppm Increases in the Air's CO2 Concentration:
For a more detailed description of this table, click here.
Picea mariana (P. Mill.) B.S.P. [Black Spruce]
300 ppm
|
600 ppm
|
900 ppm
|
|
Number of Results |
5
|
|
|
Arithmetic Mean |
33.6%
|
|
|
Standard Error |
9.2%
|
|
|
Experimental Conditions
|
300 ppm
|
600 ppm
|
900 ppm
|
|
Bigras and Bertrand (2006) |
Photosynthesis of well watered and fertilized plants grown from seed in containers filled with a 3:1 mix of peat:vermiculate in mini-greenhouses located within a larger greenhouse where they were exposed to environmental conditions that simulated a complete year (approximate season average)
|
34%
|
|
|
Johnsen (1993) |
growth chambers, well-watered
|
3%
|
|
|
Johnsen (1993) |
growth chambers, drought
|
|
|
|
Johnsen (1993) |
growth chambers, low nutrients
|
60%
|
|
|
Johnsen (1993) |
growth chambers, high nutrients
|
20%
|
|
|
Tjoelker et al. (1998) |
Seedlings grown for three months in controlled environment chambers at day/night temperatures ranging from 18/12 to 30/24?C (average results)
|
51%
|
|
|