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.

Populus deltoides Bartr. [Eastern Cottonwood]


Statistics
 
300 ppm
600 ppm
900 ppm
 Number of Results
9
 
7
 Arithmetic Mean
32.6%
 
121.6%
 Standard Error
6.6%
 
20.4%

Individual Experiment Results

Journal References

Experimental Conditions
300 ppm
600 ppm
900 ppm

Barron-Gafford et al. (2005)

Well watered and fertilized trees grown from cuttings for a four-year period in bays of the Biosphere 2 Laboratory that were coppiced at the ends of the first and second growing seasons but not thereafter; (entire ecosystem)
16%

 

 

Barron-Gafford et al. (2005)

Well watered and fertilized trees grown from cuttings for a four-year period in bays of the Biosphere 2 Laboratory that were coppiced at the ends of the first and second growing seasons but not thereafter; (entire ecosystem)
 

 

93%

Guo and Trotter (2006)

Photosynthesis of well watered potted plants in controlled climate rooms, measured one day at ambient CO2 and the next day at elevated CO2
77%

 

 

Lewis et al. (2010)

Photosynthesis of well watered and fertilized plants -- but variably with respect to phosphorus (P = 0.004 mM P as KH2PO4) -- grown from rooted nursery cuttings for ten weeks within controlled-environment chambers in 3.5-liter pots filled with a 2:1 sand:gravel mix
0%

 

 

Lewis et al. (2010)

Photosynthesis of well watered and fertilized plants -- but variably with respect to phosphorus (P = 0.5 mM P as KH2PO4) -- grown from rooted nursery cuttings for ten weeks within controlled-environment chambers in 3.5-liter pots filled with a 2:1 sand:gravel mix
38%

 

 

Pegoraro et al. (2005)

Tree photosynthesis of well watered trees grown from cuttings for four years (coppiced each year) in bays (12,000 m3 volume, 550 m2 soil surface) of the Intensive Forestry Mesocosm of the Biosphere 2 Laboratory in Oracle, Arizona, USA
 

 

179%

Pegoraro et al. (2005)

Leaf area photosynthesis of well watered trees grown from cuttings for four years (coppiced each year) in bays (12,000 m3 volume, 550 m2 soil surface) of the Intensive Forestry Mesocosm of the Biosphere 2 Laboratory in Oracle, Arizona, USA
 

 

84%

Pegoraro et al. (2007)

Photosynthesis of trees (measured in the fall of 2000 and 2002) grown from cuttings planted in 1998 in two bays of the Biosphere 2 Laboratory near Oracle, Arizona (USA), which were exposed to differential atmospheric CO2 concentrations each growing season between 1999 and 2003 under non-drought conditions
 

 

67%

Pegoraro et al. (2007)

Photosynthesis of trees (measured in the fall of 2000 and 2002) grown from cuttings planted in 1998 in two bays of the Biosphere 2 Laboratory near Oracle, Arizona (USA), which were exposed to differential atmospheric CO2 concentrations each growing season between 1999 and 2003 under droughty conditions
 

 

205%

Tissue and Lewis (2010)

Photosynthesis of well watered plants grown from 45-cm-tall cuttings in individual 3.5-liter pots filled with a 2:1 sand:gravel mixture and placed within controlled-environment chambers while fertilized daily with half-strength Hoagland's solution modified to accommodate a phosphorus (P) level of 0.1 mM P
21%

 

 

Tissue and Lewis (2010)

Photosynthesis of well watered plants grown from 45-cm-tall cuttings in individual 3.5-liter pots filled with a 2:1 sand:gravel mixture and placed within controlled-environment chambers while fertilized daily with half-strength Hoagland's solution modified to accommodate a phosphorus (P) level of 0.5 mM P
38%

 

 

Turnbull et al. (2004)

Four- to five-meter-tall trees grown for three years in air of different CO2 concentrations in three bays of the Biosphere 2 facility near Tucson, Arizona, USA, which were maintained at 15C nocturnal temperature and a single constant daytime temperature (30-32C) during this short-term experiment
36%

 

 

Turnbull et al. (2004)

Four- to five-meter-tall trees grown for three years in air of different CO2 concentrations in three bays of the Biosphere 2 facility near Tucson, Arizona, USA, which were maintained at 20C nocturnal temperature and a single constant daytime temperature (30-32C) during this short-term experiment
34%

 

 

Turnbull et al. (2004)

Four- to five-meter-tall trees grown for three years in air of different CO2 concentrations in three bays of the Biosphere 2 facility near Tucson, Arizona, USA, which were maintained at 25C nocturnal temperature and a single constant daytime temperature (30-32C) during this short-term experiment
33%

 

 

Walter et al. (2005)

Well watered and fertilized saplings, maintained in bays of the Biosphere 2 facility, that were into their second year of growth after the second of two prior coppicings; mature leaves
 

 

63%

Walter et al. (2005)

Well watered and fertilized saplings, maintained in bays of the Biosphere 2 facility, that were into their second year of growth after the second of two prior coppicings; growing leaves
 

 

160%

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