Publications by the same author
plus in the repository
plus in Google Scholar

Bibliografische Daten exportieren

Low hydrological connectivity after summer drought inhibits DOC export in a forested headwater catchment

DOI zum Zitieren der Version auf EPub Bayreuth:
URN to cite this document: urn:nbn:de:bvb:703-epub-6544-3

Title data

Blaurock, Katharina ; Beudert, Burkhard ; Gilfedder, Benjamin Silas ; Fleckenstein, Jan H. ; Peiffer, Stefan ; Hopp, Luisa:
Low hydrological connectivity after summer drought inhibits DOC export in a forested headwater catchment.
In: Hydrology and Earth System Sciences. Vol. 25 (2021) Issue 9 . - pp. 5133-5151.
ISSN 1607-7938
DOI der Verlagsversion:

[thumbnail of hess-25-5133-2021.pdf]
Format: PDF
Name: hess-25-5133-2021.pdf
Version: Published Version
Available under License Creative Commons BY 4.0: Attribution
Download (2MB)

Project information

Project title:
Project's official title
Project's id
Open Access Publizieren
No information


Understanding the controls on event-driven dissolved organic carbon (DOC) export is crucial as DOC is an important link between the terrestrial and the aquatic carbon cycles. We hypothesized that topography is a key driver of DOC export in headwater catchments because it influences hydrological connectivity, which can inhibit or facilitate DOC mobilization. To test this hypothesis, we studied the mechanisms controlling DOC mobilization and export in the Große Ohe catchment, a forested headwater in a mid-elevation mountainous region in southeastern Germany. Discharge and stream DOC concentrations were measured at an interval of 15 min using in situ UV-Vis (ultraviolet–visible) spectrometry from June 2018 until October 2020 at two topographically contrasting subcatchments of the same stream. At the upper location (888 m above sea level, a.s.l.), the stream drains steep hillslopes, whereas, at the lower location (771 m a.s.l.), it drains a larger area, including a flat and wide riparian zone. We focus on four events with contrasting antecedent wetness conditions and event size. During the events, in-stream DOC concentrations increased up to 19 mg L−1 in comparison to 2–3 mg L−1 during baseflow. The concentration–discharge relationships exhibited pronounced but almost exclusively counterclockwise hysteresis loops which were generally wider in the lower catchment than in the upper catchment due to a delayed DOC mobilization in the flat riparian zone. The riparian zone released considerable amounts of DOC, which led to a DOC load up to 7.4 kg h−1. The DOC load increased with the total catchment wetness. We found a disproportionally high contribution to the total DOC export of the upper catchment during events following a long dry period. We attribute this to the low hydrological connectivity in the lower catchment during drought, which inhibited DOC mobilization, especially at the beginning of the events. Our data show that not only event size but also antecedent wetness conditions strongly influence the hydrological connectivity during events, leading to a varying contribution to DOC export of subcatchments, depending on topography. As the frequency of prolonged drought periods is predicted to increase, the relative contribution of different subcatchments to DOC export may change in the future when hydrological connectivity will be reduced more often.

Further data

Item Type: Article in a journal
Keywords: DOC; Dissolved Organic Carbon; Hydrology; Hydrological Connectivity; DOC export
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
Research Institutions > Central research institutes > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Central research institutes
Language: English
Originates at UBT: Yes
URN: urn:nbn:de:bvb:703-epub-6544-3
Date Deposited: 25 Jul 2022 10:01
Last Modified: 25 Jul 2022 10:01


Downloads per month over past year