300, 600 and 900 ppm Increases in the Air's CO2 Concentration:
For a more detailed description of this table, click here.
Pseudotsuga menziesii (Mirbel) Franco [Douglas Fir]
|
300 ppm
|
600 ppm
|
900 ppm
|
|
| Number of Results |
21
|
21
|
21
|
| Arithmetic Mean |
25.9%
|
8.8%
|
11.3%
|
| Standard Error |
5.1%
|
6
|
7.6%
|
|
Experimental Conditions
|
300 ppm
|
600 ppm
|
900 ppm
|
|
|
Constable et al. (1999) |
open-top chambers, 1996 needles in June 1996
|
42%
|
||
|
Constable et al. (1999) |
open-top chambers, 1995 needles in June 1996
|
88%
|
||
|
Constable et al. (1999) |
open-top chambers, 1996 needles in September 1996
|
24%
|
||
|
Hollinger (1987) |
pots (4 liter)
|
31%
|
||
|
Lewis et al. (1999) |
Terracosms, July 1996
|
38%
|
||
|
Lewis et al. (1999) |
Terracosms, July 1996,elevated temperature
|
21%
|
||
|
Lewis et al. (1999) |
Terracosms, January 1997
|
-16%
|
||
|
Lewis et al. (1999) |
Terracosms, January 1997,elevated temperature
|
23%
|
||
|
Lewis et al. (1999) |
Terracosms, April 1997
|
25%
|
||
|
Lewis et al. (1999) |
Terracosms, April 1997,elevated temperature
|
46%
|
||
|
Lewis et al. (1999) |
Terracosms, July 1997
|
24%
|
||
|
Lewis et al. (1999) |
Terracosms, July 1997,elevated temperature
|
15%
|
||
|
Lewis et al. (2001) |
Photosynthesis of two-year-old seedlings grown for an additional two years within sunlit controlled-environment chambers, with measurements made throughout years 3 and 4 on intact fully expanded unshaded needles from the most recent needle cohorts
|
32%
|
||
|
Lewis et al. (2004) |
Two-yearl-old seedlings grown for 21 additional months in sunlit climate-controlled chambers maintained at soil water contents typical of the wet winter and dry summer climate of the U.S. Pacific Northwest
|
20%
|
||
|
Phillips et al. (2008) |
Photosynthesis of crowns of 20-year-old trees growing naturally at 900 ppm extra CO2
|
112%
|
||
|
Phillips et al. (2008) |
Photosynthesis of crowns of 20-year-old trees growing naturally at 300 ppm extra CO2
|
50%
|
||
|
Phillips et al. (2008) |
Crown photosynthesis of 500-year-old trees growing naturally at 300 ppm extra CO2
|
62%
|
||
|
Phillips et al. (2008) |
Crown photosynthesis of 500-year-old trees growing naturally at 600 ppm extra CO2
|
100% |
||
|
Phillips et al. (2008) |
Crown photosynthesis of 500-year-old trees growing naturally at 900 ppm extra CO2
|
125%
|
||
|
Phillips et al. (2008) |
Photosynthesis of crowns of 20-year-old trees growing naturally at 600 ppm extra CO2
|
85% |
||
|
Tingey et al. (2007) |
Photosynthesis of two-year-old seedlings grown for an additional two years as closed-canopy plant-soil-litter systems within sunlit controlled-environment chambers, where measurements included all needle age classes and significant self shading
|
19%
|