Riparian Microtopography Affects Event‐Driven Stream DOC Concentrations and DOM Quality in a Forested Headwater Catchment

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00007090
URN to cite this document: urn:nbn:de:bvb:703-epub-7090-2

Title data

Blaurock, Katharina ; Garthen, Phil ; da Silva, Maria P. ; Beudert, Burkhard ; Gilfedder, Benjamin Silas ; Fleckenstein, Jan ; Peiffer, Stefan ; Lechtenfeld, Oliver J. ; Hopp, Luisa:
Riparian Microtopography Affects Event‐Driven Stream DOC Concentrations and DOM Quality in a Forested Headwater Catchment.
In: Journal of Geophysical Research: Biogeosciences. Vol. 127 (2022) Issue 12 . - e2022JG006831.
ISSN 2169-8961
DOI der Verlagsversion: https://doi.org/10.1029/2022JG006831

	Format: PDF Name: JGR Biogeosciences - 2022 - Blaurock - Riparian Microtopography Affects Event‐Driven Stream DOC Concentrations and DOM.pdf Version: Published Version Available under License Creative Commons BY-NC 4.0: Attribution, Noncommercial
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Abstract

The transport of dissolved organic carbon (DOC) from the soils to inland waters plays an important role in the global carbon cycle. Widespread increases in DOC concentrations have been observed in surface waters over the last few decades, affecting carbon balances, ecosystem functioning and drinking water treatment. However, the primary hydrological controls on DOC mobilization are still uncertain. The aim of this study was to investigate the role of microtopography in the riparian zone for DOC export and DOM quality. DOC concentration and DOM quality in the shallow groundwater of a riparian zone and in streamflow in a forested headwater catchment was investigated using fluorescence and absorbance characteristics. We found higher DOC concentrations with a higher aromaticity in the microtopographical depressions, which were influenced by highly dynamic shallow groundwater levels, than in the flat forest soil. As a result of the frequent wet-dry cycles in the upper soil layers, aromatic DOC accumulated in the shallow groundwater within and below the microtopographical depressions. Rising groundwater levels during precipitation events led to the connection of the microtopographical depressions to the stream, resulting in a change toward more aromatic DOC in the stream. Increasing stream DOC concentrations were accompanied by increasing concentrations of iron and aluminum, suggesting the coupled release of these metals with DOC from the riparian zone. Our results highlight the importance of the interplay between microtopography and groundwater level dynamics in the riparian zone for DOC export from headwater catchments.

Further data

Item Type:	Article in a journal
DDC Subjects:	500 Science > 550 Earth sciences, geology
Institutions of the University:	Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Hydrology > Chair Hydrology - Univ.-Prof. Dr. Stefan Peiffer Faculties Faculties > Faculty of Biology, Chemistry and Earth Sciences Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Hydrology
Language:	English
Originates at UBT:	Yes
URN:	urn:nbn:de:bvb:703-epub-7090-2
Date Deposited:	13 Jul 2023 06:30
Last Modified:	13 Jul 2023 06:31
URI:	https://epub.uni-bayreuth.de/id/eprint/7090

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