Photosynthesis Under Field Conditions. XB. Origins of Short-Time CO, Fluctuations in a Cornfield'

Studies of the vertical distributions of CO2 fluctuation in a cornfield were made in the 4-to 0.25-cycle/min fre-quency range. Amplitude of fluctuations decreased with height above the ground. Frequency in this range ap-peared rather constant, however. Sources and sinks for CO, within the cornfield contribute to the fluctuations; however, eddy structure originating inside and/or outside the cornfield plays an important role too