Methane formation and consumption by sediments in a cross-channel profile of a small river impoundment

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F19%3A73597858" target="_blank" >RIV/61989592:15310/19:73597858 - isvavai.cz</a>

Result on the web

<a href="https://jlimnol.it/index.php/jlimnol/article/view/jlimnol.2019.1898/1538" target="_blank" >https://jlimnol.it/index.php/jlimnol/article/view/jlimnol.2019.1898/1538</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4081/jlimnol.2019.1898" target="_blank" >10.4081/jlimnol.2019.1898</a>

Result language

angličtina

Original language name

Methane formation and consumption by sediments in a cross-channel profile of a small river impoundment

Original language description

Rivers are a natural source of methane (CH4) into the atmosphere and may contribute significantly to total CH4 emissions. Even though the details of sources of CH4 in rivers are not fully understood, weirs have been recognized as a hotspot of CH4 emissions. In this study, we investigated CH4 production and consumption in air-exposed river sediments along a cross-channel transect located upstream of a weir. stable carbon isotopes were used for determination of individual methanogenic pathways. In order to understand the relationship between physicochemical and biological processes, additional parameters such as organic matter, grain median size, and carbon and nitrogen content were characterized as well. Generally, samples from the surface sediment layer (0-10 cm) had higher CH4 production than sediments from the deeper layer (10-20 cm) during the incubation experiments. sediments near the bank zones and in the mid-channel were characterized by the highest organic carbon content (6.9 %) as well the highest methanogenic activity (2.5 mmol g–1 dW d–1). The CH4 production was predominated by H2/CO2 dependent methanogenesis in the surface sediment layer (0-10 cm), while the proportion of acetoclastic and hydrogenotrophic methanogenesis in the deeper sediment layer (10-20 cm) was balanced. The CH4 oxidation potential of sediments showed the same spatial pattern as observed for the CH4 production. Our results showed high spatial variability of sediment CH4 production and oxidation in the cross-channel profile upstream of the weir, whereas the highest CH4 dynamics were observed in the littoral zones. This variability was closely linked with the carbon and nitrogen content in the sediment samples.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10618 - Ecology

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

JOURNAL OF LIMNOLOGY

ISSN

1129-5767

e-ISSN

—

Volume of the periodical

78

Issue of the periodical within the volume

2

Country of publishing house

IT - ITALY

Number of pages

10

Pages from-to

233-242

UT code for WoS article

000500804800008

EID of the result in the Scopus database

2-s2.0-85075994239