Figure 3. Measured fluxes of CO2 per g of total plant
biomass at the plot scale along a gradient of planted species richness
(1, 4 and 16 species plots) in various removal treatments. A) Ecosystem
respiration, B) Gross primary productivity and C) Net ecosystem exchange
of CO2 (mean +/- 1 s.e.m) in micromoles of CO2 per g plant biomass per
square meter per second. Negative values indicate carbon uptake whereas
positive values indicate carbon release.