Influence of tree species on gross and net N transformations in forest soils Bernd Zeller, Sylvie Recous, Morgan Kunze, Judicaël Moukoumi, Micheline Colin-Belgrand, Séverine Bienaimé, Jacques Ranger and Etienne Dambrine Ann. For. Sci., 64 2 (2007) 151-158 Published online: 24 February 2007 DOI: 10.1051/forest:2006099