L16_Savannas_C3_C4_Photosynthesis_comp

Geocornelledueasenergythechallengesglobalclimatechange

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Unformatted text preview: grasses and temperature" 100 90 80 70 60 50 40 30 20 10 0 0.0 N. America r = 0.97 10.0 20.0 30.0 Growing Temperature °C Teeri and Stowe 1976, Oecologia C3 and C4 grass distribution" aher Collatz et al., 1998, S=ll et al., 2003, Glob. Biogeochem. Cycl. yellow = mixed" C3 = cool growing season, C4 = warm growing season " How will C3 and C4 distribu=ons change with globally increasing CO2, temp? (Good for corn, bad for wheat. Research is currently underway that is aimed at crea=ng a gene=cally modified ‘C4’ rice Ehleringer et al., 1997, Oecologia How will changing levels of CO2 influence plant growth? C4 plant C3 plant glacial interglacial 2x today today glacial interglacial today 2x today Photos courtesy of Joy Ward, U. Kansas photosynthe=c rate (Amax) of two different savanna tree species grown at different levels of CO2 S1: first growing season S2: second growing season Kgope et al., 2010 Austral Ecology different responses of C3 trees (gray shading) and C4 grasses (white) to increasing levels of CO2 Kgope et al., 2010 Austral Ecology Implica=ons of high CO2 in fire- maintained savannas certain grass species have evolved to produce large quan==es of flammable biomass during the dry season this biomass burns during the dry season, killing trees, and favoring the growth of grass during the next rainy season Low CO2 scenario: limited growth of tree saplings Rainy (Growing) Season Implica=ons of h...
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