Percent Photosynthesis (Net CO2 Exchange Rate) Increases for
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]


Statistics
 
300 ppm
600 ppm
900 ppm
 Number of Results
17
2
2
 Arithmetic Mean
32%
92.5%
118.5%
 Standard Error
5.3%
5.3
4.6%

Individual Experiment Results

Journal References
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%

 
 

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