PS II (P680) PS I (P700) 4 photons 2 H 2 O  O 2 + 4 H + 4 e - 2 NADP + 4 H + + 2 NADP +  2 NADPH + 2 H + 4 e - 4 photons 4 e - Noncyclic photophosphorylation.

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PS II (P680) PS I (P700) 4 photons 2 H 2 O  O H + 4 e - 2 NADP + 4 H NADP +  2 NADPH + 2 H + 4 e - 4 photons 4 e - Noncyclic photophosphorylation 1(4) photons 3(4) ADP + 3(4) P i  3(4) ATP + 3(4) H 2 O Cyclic photophosphorylation electron acceptor electron acceptor 4 e - Oxidation of water Reduction of NADP + Noncyclic electron transport Figure 17.1 Ecological Climatology © 2008 G. Bonan

Figure CO H 2 O 6 PGA 6 H NADPH 6 NADP + 6 ATP 6 ADP + 6 P i 1 PGaldehyde 5 PGaldehyde 3 RuBP 3 ATP 3 ADP + 3 P i Carboxylation Reduction Regeneration 3 [  ] 6 [    ] 5 [    ] 1 [    ] 3 [      ] Ecological Climatology © 2008 G. Bonan

Figure Vapor Pressure Deficit (kPa) Temperature (  C) Photosynthetic Photon Flux Density (  mol m -2 s -1 ) Stomatal Conductance (mmol CO 2 m -2 s -1 ) Foliage Water Potential (MPa) Stomatal Conductance (mmol CO 2 m -2 s -1 ) 25  C 35  C Ecological Climatology © 2008 G. Bonan

Figure Temperature (  C) CO 2 Flux Respiration Photosynthesis Net Net CO 2 Flux -10  C45  C25  C Ecological Climatology © 2008 G. Bonan

Figure Vapor Pressure Deficit (kPa) 25  C 35  C Foliage Nitrogen (g m -2 ) CO 2 Concentration (ppm) Net Photosynthesis (  mol m -2 s -1 ) Foliage Water Potential (MPa) Net Photosynthesis (  mol m -2 s -1 ) Photosynthetic Photon Flux Density (  mol m -2 s -1 ) Net Photosynthesis (  mol m -2 s -1 ) Temperature (  C) Ecological Climatology © 2008 G. Bonan

Figure Stomatal Conductance (mmol CO 2 m -2 s -1 ) Net Photosynthesis (  mol CO 2 m -2 s -1 ) Transpiration (mmol H 2 O m -2 s -1 ) Stomatal Conductance (mmol CO 2 m -2 s -1 ) Net Photosynthesis (  mol CO 2 m -2 s -1 ) Transpiration (mmol H 2 O m -2 s -1 ) Photosynthesis Transpiration Ecological Climatology © 2008 G. Bonan

Figure Maximum Photosynthesis (  mol CO 2 m -2 s -1 ) Maximum Leaf Conductance (mmol H 2 O m -2 s -1 ) savanna grass semi-arid shrub desert annual tropical swamp tundra tundra decid. shrub boreal conifer tundra ever. shrub tropical rainforest temperate deciduous Mediterranean shrub Woody Herbaceous Ecological Climatology © 2008 G. Bonan

Figure 17.8 PPFD (  mol photons m -2 s -1 ) Photosynthesis (  mol CO 2 m -2 s -1 ) WjWj WjWj WcWc Ecological Climatology © 2008 G. Bonan

Figure V max (  mol m -2 s -1 ) J max (  mol m -2 s -1 ) Crop (dicot) Crop (monocot) Fruit tree Vegetable Tropical tree Herb Desert annual and perennial Shrub Temperate broadleaf deciduous tree Temperate needleleaf evergreen tree Ecological Climatology © 2008 G. Bonan

Figure Leaf Nitrogen (mg N g -1 ) Maximum Net Photosynthesis (nmol CO 2 g -1 s -1 ) Maximum Net Photosynthesis (nmol CO 2 g -1 s -1 ) Specific Leaf Area (cm 2 g -1 ) Leaf Nitrogen (mg N g -1 ) Specific Leaf Area (cm 2 g -1 ) Broadleaf deciduous tree Needleleaf evergreen tree Ecological Climatology © 2008 G. Bonan

Figure Leaf Nitrogen (mg N g -1 ) Leaf Respiration (nmol CO 2 g -1 s -1 ) Leaf Lifespan (months) Broadleaf forb Broadleaf shrub Broadleaf tree Needleleaf tree Leaf Respiration (nmol CO 2 g -1 s -1 ) Specific Leaf Area (cm 2 g -1 ) Leaf Respiration (nmol CO 2 g -1 s -1 ) Ecological Climatology © 2008 G. Bonan

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