This volume summarizes the current knowledge on the exchange of trace gases between forests and the atmosphere with the restriction that exclusively carbon and nitrogen compounds are included. For this purpose the volume brings together and interconnects knowledge from different disciplines of biological and atmospheric sciences. It covers microbial and plant processes involved in the production and consumption of these trace gases; the exchange processes between forest soils and vegetation on the one hand, and the atmosphere on the other hand; the fate of the trace gases exchanged inside the atmosphere as well as environmental influences on the exchange of trace gases between forest ecosystems and the atmosphere. With this interdisciplinary approach the volume provides the background for an evaluation of the exchange of trace gases between forest ecosystems and the atmosphere and man-made disturbances of this exchange.
1: Biological processes involved in trace gas exchange.
1.1. Microbiological and biochemical background of production and consumption of NO and N2O in soil; R. Conrad. 1.2. NO2, NO and HNO3 uptake by trees; A.R. Wellburn. 1.3. Production and consumption of NH4+ and NH3 in trees; J. Pearson, J. Wooda, E.C.M. Clough, K.H. Nielsen, J.K. Schjørring. 1.4. Isoprene and terpene biosynthesis; H.K. Lichtenthaler, J.G. Ziedler. 1.5. Biosynthesis of aldehydes and organic acids; J. Kreuzwieser.
2: Exchange of trace gases at the soil-atmosphere interface.
2.1. NO, NO2 and N2O; R. Gasche, H. Papen. 2.2. CH4; K. Butterbach-Bahl.
3: Exchange of trace gases at the tree-atmosphere interface.
3.1. Ammonia exchange at the tree-atmosphere interface; K.H. Nielsen, J.K. Schørring, J.W. Erisman, J. Pearson. 3.2. Isoprene and other isoprenoids; R. Steinbrecher, A Guenther, G. Seufert. 3.3. Aldehydes and organic acids; J. Kreuzwieser. Ozone; G. Wieser.
4: Forest canopies as sources and sinks of atmospheric trace gases.
4.1. Scaling up to the ecosystem level; D.D. Baldocchi, K. Wilson.
5: Atmospheric chemistry of trace gases exchanged in forest ecosystems.
5.1. Nitrogen oxides; J.N. Cape. 5.2. Ozone and volatile organic compounds: isoprene, terpenes, aldehydes, and organic acids; W.R. Stockwell, R. Forkel.
6: Environmental factors influencing tracegas exchange.
6.1. Acid rain and N-deposition; S.J. Hall, P.A. Matson. 6.2. Tropospheric ozone; C. Langebartels, G. Thomas, G. Vogg, J. Wildt, D. Ernst, H. Sandermann.