caa a22 4500 605516928 CHVBK 20210128100716.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s10533-014-0046-3 doi (NATIONALLICENCE)springer-10.1007/s10533-014-0046-3 Modelling landscape controls on dissolved organic carbon sources and fluxes to streams [Elektronische Daten] [J. Dick, D. Tetzlaff, C. Birkel, C. Soulsby] Catchment dissolved organic carbon (DOC) fluxes are governed by complex interactions, which control biogeochemical processes generating DOC and hydrological connectivity, facilitating transport through the landscape to streams. This paper presents the development of a coupled hydrological-biogeochemical model for a northern watershed with organic-rich soils, to simulate daily DOC concentrations. The parsimonious model design allows the relative importance of DOC fluxes from the major landscape units (e.g. hillslopes, groundwater and riparian saturation area) to be determined. The dynamic extent of the saturated riparian zone, which at maximum wetness comprised 40% of the drainage area, contributed 84% of DOC to the stream, of which 16% was derived from the hillslope soils. This shows the disproportional riparian influence on stream water chemistry and the importance of the non-linearity in hydrological connectivity. The temporal connectivity of each of the landscape units was dependent on antecedent moisture conditions, with highly transient connections between the hillslope and valley bottom saturated area, which were entirely disconnected during the driest periods. The groundwater contribution remained constant, but its relative importance increased during the driest periods. The study emphasises the importance of conceptualising hydrological connectivity and its relation to hydroclimatic factors, as well soil biogeochemical processes, when modelling stream water DOC. The Author(s), 2014 DOC nationallicence Runoff processes nationallicence Connectivity nationallicence Biogeochemical models nationallicence Landscape units nationallicence Upland catchments nationallicence Dick J. Northern Rivers Institute, School of Geosciences, University of Aberdeen, AB24 3UF, Aberdeen, Scotland, UK aut Tetzlaff D. Northern Rivers Institute, School of Geosciences, University of Aberdeen, AB24 3UF, Aberdeen, Scotland, UK aut Birkel C. Northern Rivers Institute, School of Geosciences, University of Aberdeen, AB24 3UF, Aberdeen, Scotland, UK aut Soulsby C. Northern Rivers Institute, School of Geosciences, University of Aberdeen, AB24 3UF, Aberdeen, Scotland, UK aut Biogeochemistry Springer International Publishing 122/2-3(2015-02-01), 361-374 0168-2563 122:2-3<361 2015 122 10533 https://doi.org/10.1007/s10533-014-0046-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10533-014-0046-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dick J. Northern Rivers Institute, School of Geosciences, University of Aberdeen, AB24 3UF, Aberdeen, Scotland, UK aut NATIONALLICENCE 700 1- Tetzlaff D. Northern Rivers Institute, School of Geosciences, University of Aberdeen, AB24 3UF, Aberdeen, Scotland, UK aut NATIONALLICENCE 700 1- Birkel C. Northern Rivers Institute, School of Geosciences, University of Aberdeen, AB24 3UF, Aberdeen, Scotland, UK aut NATIONALLICENCE 700 1- Soulsby C. Northern Rivers Institute, School of Geosciences, University of Aberdeen, AB24 3UF, Aberdeen, Scotland, UK aut NATIONALLICENCE 773 0- Biogeochemistry Springer International Publishing 122/2-3(2015-02-01), 361-374 0168-2563 122:2-3<361 2015 122 10533