2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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5/24/2021 | 8:30 AM - 10:30 AM | HYDROLOGICAL EXPORT OF CARBON AND DEGASSING IN A TROPICAL RIVER – A CASE STUDY OF THE NYONG RIVER SHOWING THE IMPORTANCE OF WETLANDS INPUTS TO THE RIVER NETWORK | Virtual Platform

HYDROLOGICAL EXPORT OF CARBON AND DEGASSING IN A TROPICAL RIVER – A CASE STUDY OF THE NYONG RIVER SHOWING THE IMPORTANCE OF WETLANDS INPUTS TO THE RIVER NETWORK

We established the riverine carbon (C) budget of the tropical Nyong Watershed (Cameroon) considering the lateral hydrological inputs of C from land (i.e., from forest groundwater) and from wetlands to the river network, the C degassing from the river network and the export to the ocean. The different C fluxes were estimated independentely, allowing to close the C budget of the Nyong basin from an approach not based on a mass balance of the inputs and outputs of C at the catchment scale. On average throughout the year, we showed that wetlands exported 60% of the total C transferred laterally to surface waters, the remaining 40% being transferred by forest groundwater (surface runoff was negligible). In addition, heterotrophic respiration in rivers averaged at less than 7% of the average degassing rate, which indicates that it is unlikely that the CO2 emissions from the river network were sustained by river heterotrophy. All together, we show the importance of lateral inputs from different land use (i.e., forest groundwater and wetlands) on the riverine C budget. Further, neglecting wetland-river connectivity may lead to the misrepresentation of C dynamics in tropical river networks.

Carbon cycle
Ecohydrology
Greenhouse gases

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Presenters/Authors

Loris Deirmendjian (), IRD, UR 234, GET, 14 Avenue E. Belin, 31400, Toulouse, France, lorisdeir@gmail.com;