Export of organic carbon in run‐off from an Amazonian rainforest blackwater catchment

• DOI: 10.1002/hyp.6217
• Publication Date: 2006-07-24T10:16:42Z
• Authors: Maarten J. Waterloo; Sylvia M. Oliveira; Debora P. Drucker; Antonio D. Nobre; Luz A. Cuartas; Martin G. Hodnett; Ivar Langedijk; Wilma W. P. Jans; Javier Tomasella; Alessandro C. de ...; Tania P. Pimentel; Juan C. Múnera Es...
• Keywords: Blackwater; Carbon fibers

Abstract Rainfall, run‐off and dissolved particulate organic carbon concentrations were measured to investigate the hydrological export of out blackwater Igarapé Asu rainforest catchment over a two‐year period. Annual rainfall was above average (2442 mm) at 2976 mm in 2002 below 2054 2003. Surface dominated flow catchment, with groundwater outflow being negligible. Streamflow totals amounted 1362 780 Dissolved (DOC) similar those elsewhere Amazon Basin 1·2 mg l −1 , leading atmospheric DOC deposition estimates 3·5 g m −2 2·4 Daily ranged from 8 under low conditions 27 during large quickflow events. Suspended sediment (10–2000‐µm size fraction) consisted for 28% had median concentration 4·1 . varied between 1·2–2·5 day dry periods corresponding exports 0·009–0·031 Exports associated storms much higher, reaching daily maximum 1·02 discharge event 38·4 mm. Export wet seasons 70% total. river water different years because differences run‐off, varying 26·2 C 11·7 Organic by DOC, constituting 6–8% Net export, corrected inputs, 22·7 9·3 2003, respectively. The present study indicates that accounting stream (averaging 19·0 year 2 years) would reduce sink strength, estimated 300–400 eddy covariance measurements, 5–6% this catchment. Copyright © 2006 John Wiley & Sons, Ltd.