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Fig. 2. Apparent values in perennial ryegrass of (A) net ecosystem exchange of CO2 (NEE; sunlit chamber) and (B) the sum of canopy and soil respiration (Rc + Rs; shaded chamber) in response to changes in chamber pressure. The apparent increase in NEE and decrease in Rc + Rs with chamber pressure were caused by the corresponding suppression of (C) soil respiration entering the chamber (Rs; bare soil); the bare soil area was surrounded closely by perennial ryegrass. Note: Scale of y axis of 2B is different from 2A and 2C.
