School of Geography, University of Leeds, LS2 9JT, UK

Institito Nacional de Pesquisas da Amazônia, Avenida André Araújo, 2936, Aleixo, CEP 69060-001, Manaus-AM, Brazil

School of Geography, University of Leeds, LS2 9JT, UK

School of Earth and Environmental Sciences, James Cook University, Cairns, Qld 4878, Australia

School of Geography and the Environment, University of Oxford, South Parks Road, Oxford, OX1 3QY, UK

School of Geography, University of Leeds, LS2 9JT, UK

Max-Planck-Institut fuer Biogeochemie, Postfach 100164, 07701, Jena, Germany

now at: Fieldwork Assistance, Postfach 101022, 07710 Jena, Germany

Max-Planck-Institut fuer Biogeochemie, Postfach 100164, 07701, Jena, Germany

now at: Department of Earth System Science, University of California, 2103 Croul Hall, Irvine, CA, 92697-3100, USA