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Title:Testing the influence of sediment granulometry on heterotrophic respiration with a new laboratory flow-through system
Authors:ID Mori, Nataša (Author)
ID Debeljak, Barbara (Author)
ID Kocman, David (Author)
ID Simčič, Tatjana (Author)
Files:URL URL - Source URL, visit http://dx.doi.org/10.1007/s11368-016-1613-0
 
.pdf PDF - Presentation file, download (1,12 MB)
MD5: 1F8F083F856871F2BC953C35B61EAC39
 
Language:English
Typology:1.01 - Original Scientific Article
Organization:Logo NIB - National Institute of Biology
Abstract:Purpose Increased sedimentation due to land use intensification is increasingly affecting carbon processing in streams and rivers around the globe. This study describes the design of a laboratory-scale flow-through incubation system as a tool for the rapid estimation of sediment respiration. The measurements were compared with those obtained using an in situ closed chamber respiration method. The influence of sediment size on respiration rates was also investigated. Materials and methods Measurements were conducted on a pre-alpine gravel-bed river sediment separated into the following grain size fractions: > 60 mm (14.3%), 60–5 mm (60.2%), 5–2 mm (13.7%), 2–0.063 mm (11.1%) and <0.063 mm (0.6%). Concurrently, in situ and laboratory measurements were carried out on a naturally heterogeneous sediment. In situ respiration was determined in closed chambers as O2 consumption over time, while in the laboratory, respiration was determined using flow-through respiration chambers. Oxygen concentrations were measured using a fibre-optic oxygen meter positioned at the inflow and outflow from the chamber. Results and discussion The mean respiration rates within naturally mixed riverbed sediments were 1.27 ± 0.3 mg O2 dm−3 h−1 (n = 4) and 0.77 ± 0.1 mg O2 dm−3 h−1 (n = 3) for the flow-through chamber system and closed chamber system, respectively. Respiration rates were statistically significantly higher in the flow-through chamber system (t test, p < 0.05), indicating that closed chamber measurements underestimated the oxygen consumption within riverbed sediments. Sediment grain size was found to significantly affect respiration rates in both systems (ANOVA, p < 0.001) with the fine sediment fraction (particle size <0.063 mm) having the highest respiration rate (rflow-through = 51 ± 23 mg O2 dm−3 h−1). The smallest fractions (2–0.063 and <0.063 mm), which represent approximately 12% of total sediment volume, contributed 60% of total respiration. Conclusions The study demonstrated that flow-through respiration chambers more accurately estimate the respiration rate within riverbed sediments than in situ closed chambers, since the former experiment imitates the natural conditions where continuous interstitial flow occurs in the sediments. We also demonstrated that fine sediments (<5 mm) substantially contribute to heterotrophic respiration in the studied gravel-bed river.
Keywords:carbon fluxes, freshwaters, geomorphology, hyporheic zone, respiration, sediments
Publication status:Published
Publication version:Version of Record
Publication date:01.01.2017
Year of publishing:2017
Number of pages:str. 1939-1947
Numbering:Vol. 17, iss. 7
PID:20.500.12556/DiRROS-19704 New window
UDC:577
ISSN on article:1439-0108
DOI:10.1007/s11368-016-1613-0 New window
COBISS.SI-ID:4134223 New window
Publication date in DiRROS:24.07.2024
Views:445
Downloads:263
Metadata:XML DC-XML DC-RDF
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MORI, Nataša, DEBELJAK, Barbara, KOCMAN, David and SIMČIČ, Tatjana, 2017, Testing the influence of sediment granulometry on heterotrophic respiration with a new laboratory flow-through system. Journal of soils and sediments : protection, risk assessment and remediation [online]. 2017. Vol. 17, no. 7, p. 1939–1947. [Accessed 6 April 2025]. DOI 10.1007/s11368-016-1613-0. Retrieved from: https://dirros.openscience.si/IzpisGradiva.php?lang=eng&id=19704
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Record is a part of a journal

Title:Journal of soils and sediments : protection, risk assessment and remediation
Publisher:Wiley
ISSN:1439-0108
COBISS.SI-ID:15925543 New window

Document is financed by a project

Funder:ARIS - Slovenian Research and Innovation Agency
Project number:L2-6778-2014
Name:Primerjalna študija ekosistemskih storitev in upravljanja v kontrastnih rečnih sistemih Slovenije
Funder:ARIS - Slovenian Research and Innovation Agency
Project number:P1-0255-2017
Name:Združbe, interakcije in komunikacije v ekosistemih
Funder:EC - European Commission
Project number:603629
Name:MANAGING THE EFFECTS OF MULTIPLE STRESSORS ON AQUATIC ECOSYSTEMS UNDER WATER SCARCITY
Acronym:GLOBAQUA

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License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

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