Nitrous oxide nitrification and denitrification 15N enrichment factors from amazon forest soils - Pérez, Tibisay; Garcia-Montiel, Diana; Trumbore, Susan; Tyler, Stanley; Camargo, Plinio Barbosa de; Moreira, Marcelo Zacharias; Piccolo, Marisa de Cassia; Cerri, Carlos Clemente (Ecological Applications, 2006)