The aim of this Handbook is to cover all fields that are necessary for the management of tropical forest resources. It provides proven and/or promis ing concepts, methods and available comparative data. The extensive references cited are a valuable source for further in-depth research on specific subjects. The handbook is addressed to forestry professionals, natural re­ source managers and all those interested in the understanding and hand­ ling of day-to-day problems of tropical forest resources. It is an attempt to present, in a concentrated form, the vast experience gathered in tropical forestry. The available knowledge although far from complete, does not permit us to stand idly by when confronted with the dwindling tropical forests. Excuses not to tackle this problem are not acceptable. The experience of the last decades gives us sufficient background to apply techniques and concepts successfully, to encom­ pass the complexity of the human and the natural tropical environment. The authors responsible for the respective sections have been recom­ mended by institutions or individuals specialized in the subject. Our thanks go to aH those unnamed individuals whose dedication and responsible work made this handbook a reality. Our gratitude also to all the colleagues who supported the handbook in its early stages by their firm commitment.