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Effects of experimental manipulations on CO2 exchange in Deschampsia mesocosms. Mean (+ SE, n = 3) (A) gross photosynthesis (PG), (B) dark ecosystem respiration (RTOT), and (C) net ecosystem exchange (NEE) with intact vegetation (control), cut aboveground vegetation (root mesocosms) and all vegetation removed (soil mesocosms) as function of time after cutting. Positive values denote carbon loss and negative values carbon uptake into the system.
