Effect of weir impoundments on methane dynamics in a river

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F17%3A00479598" target="_blank" >RIV/60077344:_____/17:00479598 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60076658:12310/17:43895535 RIV/61989592:15310/17:73579472

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.scitotenv.2017.01.163" target="_blank" >http://dx.doi.org/10.1016/j.scitotenv.2017.01.163</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.scitotenv.2017.01.163" target="_blank" >10.1016/j.scitotenv.2017.01.163</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of weir impoundments on methane dynamics in a river

Popis výsledku v původním jazyce

We measured CH4 concentration, CH4 oxidation in the water column and total CH4 emissions to the atmosphere (diffusion and ebullition) in three weir impoundments and river reaches between them, in order to understand their role in river methane (CH4) dynamics. Sediment samples were also collected to determine CH4 consumption and production potentials together with the contribution of individual methanogenic pathways. The CH4 surface water concentration increased 7.5 times in the 16 km long river stretch. Microbial CH4 oxidation in the water column reached values ranging from 51 to 403 nmol l(-1) d(-1) and substantially contributed to the CH4 removal from surface water, together with CH4 emissions. The total CH4 emissions to the atmosphere varied between 0.8 and 207.1 mmol CH4 m(-2) d(-1) with the highest values observed upstream of the weirs (mean 68.5 +/- 29.9 mmol CH4 m(-2) d(-1)). Most of the CH4 was transported through the air-water interface by ebullition upstream of the Weirs, while the ebullition accounted for 95.8 +/- 2.0% of the total CH4 emissions. Both CH4 production and oxidation potential of sediments were higher upstream of the weirs compared to downstream of the weirs. The contribution of hydrogenotrophic methanogenesis to total CH4 sediment production was 36.7-89.4% and prevailed upstream of the weirs. Our findings indicate that weirs might influence river CH4 dynamics, especially by increased CH4 production and consumption by sediments, followed by increasing CH4 emissions to the atmosphere.

Název v anglickém jazyce

Effect of weir impoundments on methane dynamics in a river

Popis výsledku anglicky

We measured CH4 concentration, CH4 oxidation in the water column and total CH4 emissions to the atmosphere (diffusion and ebullition) in three weir impoundments and river reaches between them, in order to understand their role in river methane (CH4) dynamics. Sediment samples were also collected to determine CH4 consumption and production potentials together with the contribution of individual methanogenic pathways. The CH4 surface water concentration increased 7.5 times in the 16 km long river stretch. Microbial CH4 oxidation in the water column reached values ranging from 51 to 403 nmol l(-1) d(-1) and substantially contributed to the CH4 removal from surface water, together with CH4 emissions. The total CH4 emissions to the atmosphere varied between 0.8 and 207.1 mmol CH4 m(-2) d(-1) with the highest values observed upstream of the weirs (mean 68.5 +/- 29.9 mmol CH4 m(-2) d(-1)). Most of the CH4 was transported through the air-water interface by ebullition upstream of the Weirs, while the ebullition accounted for 95.8 +/- 2.0% of the total CH4 emissions. Both CH4 production and oxidation potential of sediments were higher upstream of the weirs compared to downstream of the weirs. The contribution of hydrogenotrophic methanogenesis to total CH4 sediment production was 36.7-89.4% and prevailed upstream of the weirs. Our findings indicate that weirs might influence river CH4 dynamics, especially by increased CH4 production and consumption by sediments, followed by increasing CH4 emissions to the atmosphere.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10617 - Marine biology, freshwater biology, limnology

Projekt

<a href="/cs/project/GA13-00243S" target="_blank" >GA13-00243S: Charakteristiky životních strategií vybraných skupin Betaproteobacteria ve vztahu k jejich roli v přenosu uhlíku do vyšších trofických hladin</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Science of the Total Environment

ISSN

0048-9697

e-ISSN

—

Svazek periodika

584

Číslo periodika v rámci svazku

April

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

11

Strana od-do

164-174

Kód UT WoS článku

000399358500018

EID výsledku v databázi Scopus

2-s2.0-85011034428