Author(s)

A. Gut, A. Blatter, M. Fahrni, A. Neftel and T. Staffelbach

Abstract

Biosphere - Atmosphere exchange of NHg, NO and N%O in an agroecosystem. A. Gut, A. Blatter, M. Fahrni, A. Neftel and T. Staffelbach Swiss Federal Research Station for Agro ecology and Agriculture (FAL), Institute of Environmental Protection and Agriculture (IUL) EMail: Andreas. Gut@iuLadmin.ch Abstract In spring 1996 we started a four year research project to quantify the bi-directional exchange of nitrogen-containing trace gases between an agricultural ecosystem and the atmosphere. In the first year we intended to identify the most important processes that govern the exchange of nitrogen-containing trace gases between a field planted with winter wheat and the atmosphere during a vegetation period. NHs profiles within the canopy were monitored with a continuous four channel analyser. We employed semipermeable membrane tubes to monitor vertical NO concentration profiles in the open pore space of the soil. N%O profiles were taken periodically. Preliminary results show that the NHs exchange is d

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