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Ammonia (NH3) fluxes between beech leaves (Fagus sylvatica) and the atmosphere were investigated in a 90-year-old forest canopy and related to leaf nitrogen (N) pools and glutamine synthetase (GS) activities. The stomatal ammonia compensation point, χNH3, was measured by both a twig cuvette and bioassay techniques involving measurements of pH and ammonium (NH 4+ ) concentration in the leaf apoplastic...
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