From the research results and discussions presented in this text, theories are formulated of the various interrelationships of the nutritional aspects which allow the implementation of specific management strategies to improve stability and productivity of forest ecosystems. In particular, the effects of environmental changes as related to the impacts of air pollution, global change and land use on nutrient uptake and cycling processes in forest ecosystems are dealt with in detail. The book is divided into six main issues and each topic contains reviews as well as selected results of recent studies.