Catalán, N. and Casas-Ruiz, J. P. and Arce, M.I. and Abril, M. and Bravo, A.G. and Del Campo, R. and Estévez, E. and Freixa, A. and Giménez-Grau, P. and González-Ferreras, A.M. and Gómez-Gener, Ll. and Lupon, A. and Martínez, A. and Palacin-Lizarbe, C. and Poblador, S. and Rasines-Ladero, R. and Reyes, M. and Rodríguez-Castillo, T. and Rodríguez-Lozano, P. and Sanpera-Calbet, I. and Tornero, I. and Pastor, A. (2018) Behind the Scenes: Mechanisms Regulating Climatic Patterns of Dissolved Organic Carbon Uptake in Headwater Streams. Global Biogeochemical Cycles. ISSN 08866236
Full text not available from this repository.Abstract
Large variability in dissolved organic carbon (DOC) uptake rates has been reported for headwater streams, but the causes of this variability are still not well understood. Here we assessed acetate uptake rates across 11 European streams comprising different ecoregions by using whole‐reach pulse acetate additions. We evaluated the main climatic and biogeochemical drivers of acetate uptake during two seasonal periods. Our results show a minor influence of sampling periods but a strong effect of climate and dissolved organic matter (DOM) composition on acetate uptake. In particular, mean annual precipitation explained half of the variability of the acetate uptake velocities (VfAcetate) across streams. Temperate streams presented the lowest VfAcetate, together with humic‐like DOM and the highest stream respiration rates. In contrast, higher VfAcetate were found in semiarid streams, with protein‐like DOM, indicating a dominance of reactive, labile compounds. This, together with lower stream respiration rates and molar ratios of DOC to nitrate, suggests a strong C limitation in semiarid streams, likely due to reduced inputs from the catchment. Overall, this study highlights the interplay of climate and DOM composition and its relevance to understand the biogeochemical mechanisms controlling DOC uptake in streams.
| Item Type: | Article |
|---|---|
| Depositing User: | José Ángel Gómez Martín |
| Date Deposited: | 23 Oct 2018 09:43 |
| Last Modified: | 23 Mar 2020 09:40 |
| URI: | http://eprints.imdea-agua.org:13000/id/eprint/957 |
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