A large and innovative lab experiment involving a number of Eucalyptus camaldulensis small trees has been carried out for several week in the last summer at the CNR-IBAF lab of Porano. The measurements aimed at estimating the total carbon balance of those trees in real-time for some days using PTR-TOF, Picarro analyzer, Licor 6400 and 7000 and fumigating part of the plants with 13C under manipulation of temperature and duration of day-light. Data processing has been recently finalized and surprising results demontrated the monoterpene emission occurred only under extremely severe stress inducing damages to the cells and respiration losses of recently assimilated carbon can be monitored in different parts of the plants including soil. Two papers are under finalization and are being submitted on New Phytologist and Plant Cell & Environment. Experimental lay-out is shown here.