natur&ëmwelt / d’Haus vun der Natur asbl together with the Administration de la Gestion de l’Eau, the Musée national d’histoire naturelle and the Administration de la Nature et des Forêts, and in cooperation with the other organisations of natur&ëmwelt (Fondation Hëllef fir d’Natur, Lëtzebuerger Natur- a Vulleschutzliga a.s.b.l. and Natura a.s.b.l.) is organizing during the international year of forests 2011 a scientific colloquium with the tiltle “Multifunktionalität des Waldes” (multiple functions of forests) to be held on Friday, 7 Octobre 2011. The aim of this one-day colloquium is to present the diversity, use and benefits of forests with a special view on sustainable and economic forestry as well as concrete measures and managing plans for forest conservation. The presentation of scientific research and of concrete projects carried out in Luxembourg and abroad on different aspects of forest ecology provide new insight into common problems, and ideally new solutions and methods for the conservation of forests.The combination of international and national speakers gives a more global view of what is done and what could be done in the region. Target groups are the general public, private forest owners and more specifically professionals, researchers, and volunteers active in the fields of the protection of nature and the environment as well as forestry and silviculture (i.e. experts from the various administrations concerned, local and national authorities, “stations biologiques”, research centres, „bureaux d’études“, etc.). This is the foundation of the second very important aim of the colloquium which is to offer an exchange platform on research and projects concerning nature protection. Topics covered this year are forestry, forest ecology and water filtration in forest areas.Forests cover 44 percent of Europe’s land area (Luxembourg 34,4%) and they continue to expand. Europe’s forests represent 25 % of the world’s forest resources.The International Year of Forests, 2011 offers a unique opportunity to raise public awareness of the challenges facing many of the world’s forests and the people who depend on them. This colloquium provides a means of promoting sustainable forest management and brings involved actors together.The multiple qualities of forests, including their relationship with our water resources, their use as renewable, durable and a versatile material, the amount of carbon stored in forest biomass and the biological diversity of forests make up the importance of forests for the organizing partners, the greater region and europe. The concept of sustainable forest management in Europe, based on common principles and practices that capture the multiple functions of forests, helps to achieve economic, environmental and social objectives. The colloquium unites actors, knowledge and research results on the topic from all over the greater region for whom it is especially important to work together for the result to be successfull.Therefore this colloquium is ment to provide information and understanding of ecological patterns and effects of human interference in forest habitats, and to share ideas and practical know-how about sustainable forest managment (including water management). In order to achieve this, we consider the mixture of presentations of research results as well as concrete conservation projects, enlivened by a field excursion, particularly successful, as the theoretical information is reinforced and visualized by a practical experience. Also, the mixture of Luxembourgish and international speakers may help to compare different approaches and to bring new input and new ideas to Luxembourg and the greater region.