Watershed- and reach-scale drivers of phosphorus retention and release by streambed sediment in a western Lake Erie watershed during summer

Kreiling, Rebecca M.; Perner, Patrik Mathis; Breckner, Kenna J; Williamson, Tanja N.; Bartsch, Lynn A.; Hood, James M.; Manning, Nathan F.; Johnson, Laura T.

doi:10.1016/j.scitotenv.2022.160804

Cited by 15 publications

(2 citation statements)

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“…The potential for the streambed sediment to bind or release P can be measured with the equilibrium P concentration (EPC 0 ), which is the dissolved P concentration at which sediment neither adsorbs nor desorbs P (Froelich, 1988). To measure EPC 0 , approximately 1.5 g of wet sediment was added to each of six 50‐mL centrifuge tubes along with 30 mL 0.01 M KCl solution enriched with P concentrations of 2.0, 1.0, 0.1, 0.05, and 0 mg P/L (Kreiling et al., 2023). The samples were shaken for 24 hr at room temperature and then centrifuged at 2,900 RPM.…”

Section: Methodsmentioning

confidence: 99%

“…To measure EPC 0 , approximately 1.5 g of wet sediment was added to each of six 50-mL centrifuge tubes along with 30 mL 0.01 M KCl solution enriched with P concentrations of 2.0, 1.0, 0.1, 0.05, and 0 mg P/L (Kreiling et al, 2023). The samples were shaken for 24 hr at room temperature and then centrifuged at 2,900 RPM.…”

Section: Table 1 Details Of Continuous Spring (May) Summer (July) And...mentioning

confidence: 99%

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Importance of Dense Aquatic Vegetation in Seasonal Phosphate and Particle Transport in an Agricultural Headwater Stream

Field,

Sawyer,

Welch

et al. 2023

Water Resources Research

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Agricultural headwater streams and ditches commonly host dense stands of aquatic vegetation that grow and decay over seasons and exert physical and biological controls on the transport of nutrients from cropland to larger rivers. This study examined changes in the transport of phosphorus (P) in an agricultural drainage ditch in the Maumee River Basin (Ohio, USA) by conducting constant rate injections of a novel tracer mixture [conservative salt (Cl as NaCl), dissolved P (KH2PO4), and a fluorescent fine particle] in spring, summer, and fall. We quantified transport behavior for solutes and particles using a traditional transient storage modeling framework consisting of mobile and immobile storage zones connected by a first‐order exchange rate constant. Transient storage was greatest during the spring, when thicker vegetation caused more pooling and flow stagnation, and decreased through fall, as vegetation thinned. Soluble P uptake lengths were 8.7 times longer in fall than spring, likely due to declines in biological uptake rates with colder temperatures and immobile zone storage with thinning vegetation. Particle capture lengths also decreased by a factor of 4.3 from fall to spring. With the increasing eutrophication of Lake Erie and waterbodies around the world that lie downstream from agricultural landscapes, it is beneficial to understand nutrient transport across watersheds, including small agricultural streams. This study highlights the physical and biological roles that aquatic vegetation plays in small agricultural streams by creating seasonally variable immobile zones that slow the flow of nutrients, providing surface area for biofilms, and capturing particles that bind nutrients.

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Section: Methodsmentioning

confidence: 99%

Section: Table 1 Details Of Continuous Spring (May) Summer (July) And...mentioning

confidence: 99%