CARBON FLOW AND STORAGE IN A FOREST ECOSYSTEM 



351 



Fig. 2 Seasonal pattern of forest-floor carbon evolution (in C0 2 ) measured in 

 situ with an infrared-gas analyzer. Evolution was partitioned between O, , 2 , 

 and soil horizons using plexiglass sheets. All data points represent 24-hr means. 



crickets, Oecanthus-, and weevils, Odontopus calceatus) progressively decreased 

 during the growing season, but biomass (x = 170 mg/m 2 ) increased owing to 

 the continued growth of individuals. The combined biomass (64 mg/m 2 ) of the 

 cicadellid and aphid {Macrosiphum liriodendroni) sap feeders decreased by early 

 summer owing to heavy predation by aphidlions (Chrysopa). Psocoptera (8 

 mg/m ) and four species of omnivorous ants (2 mg/m 2 ) complete the 

 nonpredaceous component of canopy-insect biomass. Predators (almost exclu- 



