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.