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Net carbon dioxide exchange in the light and carbon dioxide efflux in the dark were observed at mid-season for tussock and intertussock tundra plant communities over diurnal courses on a four hour basis. Community carbon dioxide uptake was greater in tussock areas, but increased strongly in both areas with increasing photosynthetic photon flux density (PPFD) between 0 and 500 μmol m − 2 S −1 and tended...
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