EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/22/2019 | 10:15 AM - 10:30 AM | PATTERNS IN N, P, AND SI STOICHIOMETRY FROM AGRICULTURAL RIVERS IN EAST-CENTRAL ILLINOIS | 253 AB
PATTERNS IN N, P, AND SI STOICHIOMETRY FROM AGRICULTURAL RIVERS IN EAST-CENTRAL ILLINOIS
Understanding controls on the timing and magnitude of nitrogen (N), phosphorus (P), and silica (Si) concentrations and loads will allow us to better characterize the mechanisms affecting N:P:Si export from agricultural watersheds. The availability of these essential nutrients affects the composition of algal communities, and can influence shifts between diatoms and harmful, cyanobacterial dominance. Using samples collected weekly for 17 years (2000-2017) from two rivers in east-central Illinois, we calculated N:Si and P:Si molar ratios for each sample, as well as interpolated daily loads using the R package, Loadflex. These values exhibited a relationship with discharge, indicating strong hydrologic control on the stoichiometry of nutrient export. N:Si ratios were consistently above the Redfield ratio for diatoms (16N:20Si) during periods of higher flow through the winter and spring, but fluctuated above and below the ratio during low flow periods in the summer. P:Si fluctuated above and below the Redfield ratio (1P:20Si) throughout the year, and specific high flow events corresponded with peaks in P:Si. These results revealed important stoichiometric patterns and have implications for predicting water quality and cyanobacteria occurrence in the agricultural Midwest and other human-dominated landscapes.
- Biogeochemistry
- Nutrients
- Temporal
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Presenters/Authors
Lienne Sethna
(), Indiana University, lsethna@iu.edu;
ASHA DISCLOSURE:
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Todd V. Royer
(), Indiana University Bloomington, troyer@indiana.edu;
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