Fig. 6.

Above ground vascular plant biomass in relation to changes in a net ecosystem exchange of CO₂ (NEE), b ecosystem respiration (R _e) and c gross ecosystem photosynthesis (GEP) measured in July at Thiisbukta in grazed wet moss tundra (open circle) and 4 year old exclosures (filled circle). The data are from three biomass harvests from all plots in three consecutive weeks concurrent with the CO₂ flux measurements. Positive fluxes represent an efflux of CO₂ whilst negative values indicate uptake of CO₂ from the atmosphere