Biomass, Litterfall and Nutrients of tree Species in a native Forest in South Brazil Seite 157 125. Jahrgang (2008), Heft 3 S. 157–182 Biomass, Litterfall and Nutrients of tree Species in a native Forest in South Brazil Biomasse, Streufall und Nährelemente von Baumarten eines Naturwaldes in Südbrasilien Hamilton L.M. Vogel, Peter Spathelf 1 , Mauro V. Schumacher, Peter Trüby Keywords: Biomass, leaves, litter, nutrients, native forest Schlagwörter: Biomasse, Blätter, Streu, Nährelemente, Naturwald Abstract Studies dealing with nutrient cycling in native forests are still rare in Brazil. The present study was conducted in a fragment of a seasonal deciduous forest in Itaara (federal state of Rio Grande do Sul, Brazil). The main objec- tives of the study are (1) the determination of above-ground biomass, (2) the calculation of nutrient content and stocks in the tree components and (3) the evaluation of the monthly litterfall with the respective nutrients of the tree species analyzed. Above-ground biomass was highest for branches, followed by trunk wood, trunk bark and leaves. The content of the ma- cronutrients N, P, K, Ca, Mg and S was determined by the methodology of 1 Peter Spathelf, University of Applied Sciences Eberswalde, Alfred-Möller-Str. 1, 16225 Eberswalde, Germany (corresponding author)