FIGURE 3.

Examples of ecotron isotopic labelling and process measurements: Air ¹³CO₂ enrichment and plant¹³C labelling in one macrocosm of the Montpellier Ecotron (a); measurements of net ecosystem CO₂ exchange (b) and net ecosystem N₂O exchange (c) with photosynthetic photon flux density (PPFD) in one macrocosm of the same ecotron; measurements of the emission of two volatile organic compounds (isoprene and methanol) with PPFD in one of the sub‐chambers of the München ExpoSCREEN facility (d, e)