Plant Photosynthesis (Net CO2 Exchange Rate) Responses
to Atmospheric CO2 Enrichment

O

   300 ppm   600 ppm   900 ppm 
Plant Name  Number of
Studies 
 Arithmetic
Mean 
 Standard
Error 
 Number of
Studies 
 Arithmetic
Mean 
 Standard
Error 
 Number of
Studies 
 Arithmetic
Mean 
 Standard
Error 
Oak, Chapman's [Quercus chapmanii] 453%4.1%        
Oak, Cork [Quercus suber] 328.7%16.9% 1130%0% 1180%0%
Oak, Downy [Quercus pubescens] 5136.8%58.5%        
Oak, Durmast [Quercus petraea] 223.5%0.4%        
Oak, Holly [Quercus ilex] 1191.4%30.1%        
Oak, Mongolian [Quercus crispula] 219%3.5% 268.5%1.1%    
Oak, Mongolian [Quercus mongolica] 219%3.5% 268.5%1.1%    
Oak, Myrtle [Quercus myrtifolia] 960.6%7.7%        
Oak, Northern Red [Quercus rubra] 1663%10.4% 182%0%    
Oak, Pedunculate [Quercus robur] 935.8%6.2%        
Oak, Sand Live [Quercus geminata] 615.7%5.9%        
Oak, White [Quercus alba] 3142%38.3%        
Oatgrass, Tall [Arrhenatherum elatius] 139%0%        
Oat, Red [Avena sativa] 232.5%3.9%        
Oat, Slender [Avena barbata] 252%5.7%        
Oat, Wild [Avena fatua] 253%11.3%        
Ocimum basilicum [Basil] 194%0%        
Oenothera primiveris [Desert Eveningprimrose] 123%0%        
Okra [Abelmoschus esculentus] 127%0%        
Old Man Saltbush [Atriplex nummularia] 311.3%4.6%        
Olea europaea [Olive] 1050.2%12.6%        
Olearia ilicifolia [Holly-Leaved Daisybush] 179%0%        
Olive [Olea europaea] 1050.2%12.6%        
Onion [Allium cepa]     122%0%    
Opuntia ficus-indica [Prickly Pear] 726.7%4.3%        
Orange, Sour [Citrus aurantium] 12111.6%15.3% 1210%0%    
Orange, Sweet, Ridge Pineapple [Citrus sinensis] 257%4.9%        
Orange, Valencia [Citrus sinensis (L.) Osbeck x Citrus sinensis Blanco (Cleoplatra manderin)] 242.5%15.9%        
Orange, Valencia [Citrus sinensis (L.) Osbeck x Citrus sinensis (L.) Raf.] 254.5%5.3%        
Orange, Washington Naval [Citrus sinensis (L.) Osbeck budded to Citrus sinensis Blanco (Cleopatra manderin) rootstock] 252.5%10.3%        
Orange, Washington Naval [Citrus sinensis (L.) Osbeck budded to Citrus sinensis (L.) Raf. rootstock] 243.5%8.1%        
Orchardgrass [Dactylis glomerata] 1239.3%7.2%        
Orchid [Phalaenopsis] 8151.4%37.8%     293%0.7%
Orchid Herb [Eupatorium stoechadosmum] 319.7%8.8%        
Oregano [Oreganum vulgare] 261%11.3%        
Oreganum vulgare [Oregano] 261%11.3%        
Ormosia pinnata [Tree] 245%2.8%        
Orontium aquaticum [Goldenclub] 772.1%9.3%        
Oryza sativa [Rice] 8644.9%4.6% 1066%9.6% 156%0%
Oryzopsis hymenoides [Perennial Bunchgrass] 147%0%        

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