Summarizes the knowledge of magnesium and its role in forest ecosystems gathered from recent studies as well as from historical experiences and findings.
1. Introduction; R.F. Huttl, W. Schaaf. 2. Visual Mg-Deficiency Symptoms (Coniferous, Deciduous Trees) and Threshold Values (Foliar, Soil); P. Ende, F.H. Evers. 3. Temporal and Spatial Development of Mg Deficiency in Forest Stands in Europe, North America, New Zealand; G. Landmann, et al. 4.1 Biogeochemistry of Mg in Forest Ecosystems; K.H. Feger. 4.2. Tree Physiology; S. Slovik. 4.3. Influence of Magnesium Supply on Tree Growth; K. Makkonen-Spieker, H. Spiecker. 5. Causes of Magnesium Deficiency in Forest Ecosystems; K. Katzensteiner, G. Glatzel. 6.1 Soil Chemistry; S. Augustin, et al. 6.2. Tree Nutrition; M. Kaupenjohann. 6.3. Structural Aspects of Mg-Deficiency; S. Fink. 6.4. Fine Root Development; S. Raspe. 7. Evaluation of Different Mg Fertilization Strategies; W. Schaaf. 8. Concluding Remarks; R.F. Huttl.