Linkages Between Mineral Element Composition of Soils and Sediments With Hyporheic Zone Dissolved Organic Matter Chemistry Across the Contiguous United States.

Autor: Roebuck, J. Alan, Rod, Kenton A., Garayburu‐Caruso, Vanessa A., Chu, Rosalie K., Goldman, Amy E., Renteria, Lupita, Taylor, Micah, Stegen, James C.
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Zdroj: Geophysical Research Letters; 3/28/2024, Vol. 51 Issue 6, p1-10, 10p
Abstrakt: The hyporheic zone is a hotspot for biogeochemical cycling where interactions with mineral metals preserve the release and biodegradation of organic matter (OM). A small fraction of OM can still be exchanged between localized sediments and the overlying water column, and recent evidence suggests there exists a longitudinal structuring in sediment dissolved OM (DOM) chemistry across the continental United States (CONUS). In this study, we tested a hypothesis that water extractable sediment DOM chemistry could be explained by sediment metal contents and integrative watershed scale features at the CONUS scale. Crowdsourced samples were characterized for high resolution mass spectrometry and coupled with sediment metals determined via x‐ray fluorescence as well as with land cover and soil elemental information obtained from national databases. Our results highlight weak relationships between DOM chemistry and elemental composition at the CONUS scale indicating limited transferability of organo‐metal linkages into multi‐scale hydrobiogeochemical models. Plain Language Summary: The hyporheic zone is a vital area for chemical cycling that influences the breakdown of organic matter due to interactions with minerals and metals. Some organic matter moves between sediment and water. Recent findings show that sediment organic matter chemistry displays unique east‐west patterns across the continental United States. We tested whether crowdsourced sample sediment organic matter composition could be explained by its mineral metal composition and surrounding environmental features (land cover and soil metal composition). Results revealed weak connections between dissolved organic matter chemistry and elements, indicating limits in applying these connections to continental scale models. Key Points: Sediment dissolved organic matter chemistry is longitudinally structured across the continental United StatesSediment and soil mineral elemental compositions were weakly correlated with sediment dissolved organic matter compositionLocalized metal‐organic matter linkages likely have limited capacity to inform continental‐scale hydrobiogeochemical models [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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