Changes in Soil Carbon Expansion of ice sheets Expansion of ice sheets  Covered or displaced forests  Coniferous and deciduous trees Displaced forests replaced by steppes and grasslandsDisplaced forests replaced by steppes and grasslands –Have lower carbon biomass Pollen records in lakes Pollen records in lakes  Indicate glacial times were dryer and less vegetated than interglacial  Estimates of total vegetation reduced by 25% (15-30%) during glacial maxima CO 2 removed from atmosphere did not go into vegetation on land!CO 2 removed from atmosphere did not go into vegetation on land!
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