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Yang, Shang-Shyng

doi:10.1023/a:1006536820697

Cited by 16 publications

(4 citation statements)

References 9 publications

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“…However, CH 4 fluxes (12.79 ± 2.40 and 5.04 ± 0.64 g C m −2 yr −1 at H and R, respectively) were high compared with CH 4 production rates in anoxic sediments in the reservoirs fed by our streams (benthic CH 4 flux: 6∼8 g C m −2 yr −1 in the Rappbode and Hassel pre-dams [Tittel et al, 2019]). It is reasonable to assume that methanogenesis in stream sediments was even lower than in those organic-rich reservoir sediments (Maeck et al, 2013;S.-S. Yang, 1998). CH 4 production might play a role in modifying and supplementing the baseline CH 4 level set by groundwater discharge but the majority of the CH 4 must originate from lateral inflow.…”

Section: Sources Of Stream Chmentioning

confidence: 99%

Temporal Patterns of Methane Emissions From Two Streams With Different Riparian Connectivity

Leng

Kamjunke

et al. 2021

JGR Biogeosciences

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Streams are conduits and active processors of substances, linking different landscapes in the Earth's surface environment (Battin et al., 2008). Though streams only contribute a small part of the global surface area (0.3%-0.56% of the total land surface [Downing et al., 2012]), they are hot spots of biogeochemical cycling and greenhouse gas emissions. Although streams are typically oxic in the water column, recent evidence shows that streams and rivers can be responsible for as much as 50% of the CH 4 emitted from freshwaters (Stanley et al., 2016). However, assessment of the role of streams in the global CH 4 balance is hampered by a lack of data-especially long-term data. There is still a large uncertainty in CH 4 fluxes and the predicted Abstract Streams are regionally important sources of CH 4 to the atmosphere, but the temporal variability in and control on CH 4 concentrations and emissions are not well understood. Especially, lack of long-term data hampers our ability to predict CH 4 emissions from streams. Here, we present a 7-year data set of biweekly CH 4 concentration and underlying potential drivers from two adjacent small German streams with contrasting riparian area characteristics. Over the 7-year study period, mean CH 4 concentration and emissions were 0.20 and 0.07 μmol L −1 and 2.01 and 0.84 mmol m −2 d −1 for the two streams, respectively. Our findings suggest that the combination of seasonality and topography ultimately shaped the considerable temporal variations of CH 4 . CH 4 oxidation and production in the streams were probably of minor importance. Instead, fluctuations in CH 4 concentrations likely reflected a temporal pattern of CH 4 input from soils of the riparian zone with larger CH 4 variations in the stream with more riparian lands. Structural equation modeling revealed dissolved organic carbon and nitrate as important predictors of CH 4 concentration. However, we did not identify predictors of the considerable short-term variability, nor the explicit pathways of CH 4 delivery to streams. The discrepancy of the CH 4 flux between streams was likely triggered by different connectivities to riparian soils with higher CH 4 emissions in the hydrologically more connected stream. Interannual comparison showed that changing hydrologic conditions, rather than warming, may impact future CH 4 emissions from temperate streams. We predict that higher CH 4 emissions occur in wetter years in streams with close connectivity to riparian soils.Plain Language Summary Streams are increasingly recognized as an important source of methane (CH 4 ) to the atmosphere. However, emissions are extremely variable because the CH 4 concentration in streams changes a lot with time. We analyzed a long-term time series of CH 4 concentrations in two small German streams to understand the mechanisms behind these temporal fluctuations. Our two streams were always supersaturated in CH 4 and thus, emitted CH 4 to the atmosphere. A large part of the temporal variability can be explained by seasonal changes of discharge and ...

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Section: Sources Of Stream Chmentioning

confidence: 99%

Temporal Patterns of Methane Emissions From Two Streams With Different Riparian Connectivity

Leng

Kamjunke

et al. 2021

JGR Biogeosciences

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“…Methane production in the sediment (SZN) ranged from 0.58 to over 1.67 mg CH 4 L −1 d −1 depending on the incubation temperature and with a maximum at 30 °C. These values were in the range of the methane production determined for river and pond sediments investigated by Yang [26] in northern Taiwan (0.24–18.0 mg CH 4 L −1 d −1 ) and for Lake Kinneret in Israel (0.38–7.68 mg CH 4 L −1 d −1 ) investigated by Schwarz and co-workers [27]. Methane formation was also higher than that found in sludges from acidic bog lakes Grosse Fuchskuhle (Germany) (0.032–0.368 mg CH 4 L −1 d −1 ) [28].…”

Section: Discussionmentioning

confidence: 56%

Changes in the Substrate Source Reveal Novel Interactions in the Sediment-Derived Methanogenic Microbial Community

Szafranek-Nakonieczna

Pytlak

Grządziel

et al. 2019

IJMS

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Methanogenesis occurs in many natural environments and is used in biotechnology for biogas production. The efficiency of methane production depends on the microbiome structure that determines interspecies electron transfer. In this research, the microbial community retrieved from mining subsidence reservoir sediment was used to establish enrichment cultures on media containing different carbon sources (tryptone, yeast extract, acetate, CO2/H2). The microbiome composition and methane production rate of the cultures were screened as a function of the substrate and transition stage. The relationships between the microorganisms involved in methane formation were the major focus of this study. Methanogenic consortia were identified by next generation sequencing (NGS) and functional genes connected with organic matter transformation were predicted using the PICRUSt approach and annotated in the KEGG. The methane production rate (exceeding 12.8 mg CH4 L−1 d−1) was highest in the culture grown with tryptone, yeast extract, and CO2/H2. The analysis of communities that developed on various carbon sources casts new light on the ecophysiology of the recently described bacterial phylum Caldiserica and methanogenic Archaea representing the genera Methanomassiliicoccus and Methanothrix. Furthermore, it is hypothesized that representatives of Caldiserica may support hydrogenotrophic methanogenesis.

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“…Esto se debe a que el CH 4 producido en los sedimentos tiene mayor probabilidad de ser oxidado ya que la columna de agua rica en oxígeno es más larga (Bastviken et al, 2004;Tavares Lima, 2005). A su vez, es de esperar que el aumento de NA como consecuencia de las altas precipitaciones promueva la dilución del contenido de materia orgánica biodegradable (Quirós et al, 2002), disminuyendo así la producción de CH 4 (Yang, 1998). Además, valores altos de OD inhiben completamente la actividad de los microorganismos metanogénicos (Borrel et al, 2011).…”

Section: Metano Disuelto Y Parámetros Fisicoquímicos Del Aguaunclassified

“…Estudios realizados en otros lagos del mundo mostraron una correlación lineal estadísticamente significativa de tanto la DBO y la DQO del agua, así como del contenido de materia orgánica en sedimentos respecto de la producción de CH 4 en los sedimentos (Yang, 1998). A pesar de que los valores de DQO no se corresponden directamente con los valores de DBO, pueden ser útiles cuando se comparan las condiciones de un cuerpo de agua de un estado a otro (Hem, 1985), tal como se realizó en este trabajo de tesis.…”

Section: Metano Disuelto Y Parámetros Fisicoquímicos Del Aguaunclassified

Variaciones estacionales e interanuales de la emisión de metano en una laguna del humedal pampeano

Fusé¹

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La presente tesis doctoral reporta mediciones sistemáticas de flujos de metano (CH4) en la interfaz agua – atmósfera en una laguna de la provincia de Buenos Aires (Argentina). Las mediciones se realizaron mediante la técnica de la cámara estática en campañas de muestreo de carácter estacional llevadas a cabo durante el período Abril 2011 – Marzo 2015. Simultáneamente, se tomaron muestras de agua para la determinación de la concentración de CH4 disuelto, se midieron ciertos parámetros fisicoquímicos del agua y se registraron las condiciones meteorológicas. A su vez, durante este período y en algunas campañas realizadas previamente, se midieron las concentraciones de CH4 atmosférico mediante la obtención de muestras integradas de aire en períodos de recolección de 15 días. Los resultados indican que la laguna se comporta principalmente como una fuente de CH4; sin embargo, existió una alta variabilidad tanto estacional como interanual de las concentraciones de CH4 en el agua y en el aire y de los flujos de CH4 desde la laguna de acuerdo a las diferentes condiciones ambientales registradas. Los mayores flujos se midieron en estaciones cálidas y precedidas por períodos de bajas precipitaciones. Durante estas campañas se registraron los menores contenidos de oxígeno disuelto y los mayores valores de materia orgánica y turbidez del agua. Este último fue el parámetro que mejor representó la variabilidad de las precipitaciones y su influencia sobre la morfología de la laguna, fisicoquímica del agua y por lo tanto, sobre la producción y emisión de CH4. En este sentido, la medida de la turbidez del agua, junto al registro de la temperatura del agua, podrían ser parámetros indicativos de las variaciones estacionales y del estado de la laguna y, por lo tanto, sugieren si su comportamiento es de fuente o de sumidero de CH4. Estos estudios se ubican entre las primeras experiencias en nuestro país sobre mediciones directas de flujos de CH4 desde cuerpos de agua. Los resultados obtenidos muestran la necesidad de extrapolar el estudio a otras lagunas del país con el fin de evaluar las metodologías sugeridas y aportar datos que sean de utilidad en el conocimiento de la magnitud de las emisiones de CH4 por fuentes naturales dentro del territorio argentino.

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Untitled

Cited by 16 publications

References 9 publications

Temporal Patterns of Methane Emissions From Two Streams With Different Riparian Connectivity

Temporal Patterns of Methane Emissions From Two Streams With Different Riparian Connectivity

Changes in the Substrate Source Reveal Novel Interactions in the Sediment-Derived Methanogenic Microbial Community

Variaciones estacionales e interanuales de la emisión de metano en una laguna del humedal pampeano

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