The material presented here is based on presentations and discussions held at the 1990 Sigtuna workshop. We have organized the material into five sections, the first containing papers of general relevance to all the developed research plans, followed by three sections divided by geographical regions (high–latitude, mid–latitude, and tropical ecosystem regions), and the final section dealing with rice paddy agriculture, which because of its potential role as a significant source of CH4 and N2O was singled out for a specific set of studies. Each section, except the first dealing with general issues, concludes with a working group report developed at the workshop. These reports identify specific research needs to address biosphere atmosphere exchange research for each region.
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