Journal
SCIENTIFIC REPORTS
Volume 5, Issue -, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/srep16328
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Funding
- project ECOGLOBE (DFF, Denmark) [09-067335]
- project DONCOPRA [PU 136/7-1, CRA-80/10]
- project CARBONET (Spanish Ministry of Economy and Competitiveness) [CGL2011-30474-C02-01]
- project ANII-FCE (Fondo Clemente Estable, Uruguay) [2009 2749]
- project ANII-FCE (Conicyt, Chile) [PAI 79100016]
- project ANII-FCE (Universidad Austral de Chile) [DID-UACh SE-2011-2]
- DCE - Danish Centre for Environment and Energy, Aarhus University
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Agricultural land covers approximately 40% of Earth's land surface and affects hydromorphological, biogeochemical and ecological characteristics of fluvial networks. In the northern temperate region, agriculture also strongly affects the amount and molecular composition of dissolved organic matter (DOM), which constitutes the main vector of carbon transport from soils to fluvial networks and to the sea, and is involved in a large variety of biogeochemical processes. Here, we provide first evidence about the wider occurrence of agricultural impacts on the concentration and composition of fluvial DOM across climate zones of the northern and southern hemispheres. Both extensive and intensive farming altered fluvial DOM towards a more microbial and less plant-derived composition. Moreover, intensive farming significantly increased dissolved organic nitrogen (DON) concentrations. The DOM composition change and DON concentration increase differed among climate zones and could be related to the intensity of current and historical nitrogen fertilizer use. As a result of agriculture intensification, increased DON concentrations and a more microbial-like DOM composition likely will enhance the reactivity of catchment DOM emissions, thereby fuelling the biogeochemical processing in fluvial networks, and resulting in higher ecosystem productivity and CO2 outgassing.
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