2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/26/2021 | 8:30 AM - 10:30 AM | USING FLUORESCENCE SPECTROSCOPY TO CHARACTERIZE DISSOLVED ORGANIC MATTER IN EASTERN KANSAS STREAMS | Virtual Platform

USING FLUORESCENCE SPECTROSCOPY TO CHARACTERIZE DISSOLVED ORGANIC MATTER IN EASTERN KANSAS STREAMS

Increased land use changes alter the chemical composition of dissolved organic matter (DOM), resulting in implications for the microbial community and ramifications for water quality. Yet, the effects of land use changes in streams, particularly agriculturally-dominated landscapes, are understudied. Therefore, we studied the effects of land use change on the composition of DOM in the six sites: three streams draining predominantly cropland watersheds (>80% row crop) and three streams draining predominantly grassland watersheds (>80% grassland). We asked: are there different DOM composition signatures in streams draining cropland versus grassland watersheds? We used fluorescence spectroscopy (freshness index (BIX) and fluorescence index (FI)) to examine how the origin of organic matter (OM) and the microbial influence vary between our two land uses. BIX and FI were comparable in biofilm and stream sediment leachate from the grassland and cropland watersheds, indicating no land use effects on DOM composition. However, we found that the OM composition varied by biomass type of the dominant vegetation in the watershed. Future work analyzing dissolved organic carbon samples to calculate the specific ultraviolet absorbance spectrum will promote further understanding of the relationship between DOM and land use effects.

Organic matter
Biogeochemistry
Stream

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Presenters/Authors

Kaci Zarek (), The University of Kansas, kacizarek10@gmail.com;