L16_Savannas_C3_C4_Photosynthesis_comp

Good variable promong re resisng re grow fastlaterally

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Unformatted text preview: ound biomass Belowground biomass Growth Roo=ng depth Physical palatability Chemical palatability Regrowth aher herbivory Regrowth aher trampling Fire ecology strategy Light ecology strategy Albedo Grasses Shrubs/Trees low, <1 - 2 meters variable, up to 10s meters dies back each season seasonally persistent large frac=on of total small frac=on rapid but brief slower but prolonged shallower deeper tough / abrasive less tough / abrasive lower in toxins higher in toxins good variable good variable promo=ng fire resis=ng fire grow fast/laterally grow tall some=mes high (dead grass) low (live and “dead”) The forest – savanna/grassland transi=on zone • Herbivory (esp. large mammals such as elephants) •  Soil Quality (nutrients, water holding ability) forest savanna •  Fire Frequency trees grass grassland Observed Influences: •  Rainfall (amount, seasonal distribu=on) no woody cover low woody cover high woody cover What determines amount of woody cover in savanna ecosystems? Elephants destroying woody vegeta=on, Kruger N.P., South Africa Savanna fires. A natural occurrence in many savanna ecosystems, necessary for clearing out underbrush. Also necessary for germina=on of some types of seeds. high woody cover low woody cover can these two situa=ons exist under iden=cal clima=c condi=ons? Why does it maTer for the global Earth system? clima=c: •  grass has higher albedo than live trees dry •  differences in moisture recycling— for example...
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This document was uploaded on 03/26/2014 for the course GEC AS.270.103 at Johns Hopkins.

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