The relationship between 'ANTPOT.18 O'/'ANTPOT.16 O' and 'ANTPOT.13 C'/'ANTPOT.12 C' ratios of ambient C 'O IND.2' in two Amazonian tropical forests - Sternberg, L S L; Moreira, Marcelo Zacharias; Martinelli, Luiz Antonio; Victoria, Reynaldo Luiz; Barbosa, E M; Bonates, L C M; Nepstad, D (Tellus, 1998)