Abstract
Based on forest experiments, we found a compensation point of 0.4 ppb for the exchange of ammonia with spruces at the Schachtenau site in June 1991. Thus, emission of ammonia from spruces was observed, when the atmospheric concentration was below 0.4 ppb, and uptake was found under conditions with higher mixing ratios. In general, a spruce site like the Schachtenau site acts as a sink for ammonia emitted from other ecosystems (e.g. agricultural sites). This is further supported by gradient measurements in correlation with cuvette data under higher atmospheric mixing ratios in September 1990. For a wheat field site at Manndorf we report a strong diurnal variation of net NH3 fluxes showing emission over the day and deposition during the night in close correlation to CO2 fluxes induced by the assimilation and respiration of the wheat field. This behaviour points to the plant physiological control of the NH3 exchange.
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