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- Title
Colloidal catchment response to snowmelt and precipitation events differs in a forested headwater catchment.
- Authors
Burger, Dymphie J.; Vogel, Johnny; Kooijman, Annemieke M.; Bol, Roland; de Rijke, Eva; Schoorl, Jorien; Lücke, Andreas; Gottselig, Nina
- Abstract
Climate change affects the occurrence of high‐discharge (HD) events and associated nutrient exports in catchment stream water. Information on colloidal events‐based losses of important nutrients, such as organic C(Corg), N, P, and S, remain relatively scarce. We hypothesized that contributions of colloidal exported N, S, and P due to differing hydrological mechanisms vary between HD events in late winter and spring. We examined one combined snowmelt and rainfall event (March 2018) with one rainfall event (May 2018) for temporal Corg, N, P, and S dynamics. The catchment exports of colloids and their subset nanoparticles were analyzed by asymmetric‐flow field flow fractionation (P) and a filtration cascade (N and S). The Corg source in both events was assessed by δ13C composition of the stream water in relation to that of the soil. In winter, <6% of stream water P was transported by colloids (>0.1 μm), but this was 29–64% in spring and was associated with Corg, Fe, and Al. Colloidal N and particulate S (>1 μm) were higher during both events, but the majority of losses were dissolved (<0.1 μm). The δ13C values of dissolved organic matter (13CDOM) showed that in winter, most Corg was exported from the hydrologically connected hillslopes by water flowing through mineral horizons, due to snowmelt. During and after the rainfall events, export from organic horizons dominated the nutrient losses as particulates, including colloids. These events highlight the need for a better quantification of often underreported particulate, colloid, and nanoparticle contributions to weather‐driven nutrient losses from catchments. Core Ideas: Overland flow contribution is critical in the spring event, in winter more by groundwater.P, Norg, and Sorg coupled to Corg transport are most prominent for the spring event.Dissolved N and S dominate export losses, whereas particulates are more important in spring.Colloidal P dominates export loss, whereas in spring it is bound to Corg.Colloidal export N, S, and P spring losses are still often overlooked in export budgets.
- Subjects
SNOWMELT; METEOROLOGICAL precipitation; WATERSHEDS; COLLOIDS; NANOPARTICLES
- Publication
Vadose Zone Journal, 2021, Vol 20, Issue 3, p1
- ISSN
1539-1663
- Publication type
Article
- DOI
10.1002/vzj2.20126