Existence of micropores on the tiller surface of Schoenoplectus subalatus: the probable port for methane emission

Kulshreshtha, K.; Singh, Sunil Kumar; Agnihotri, Savita

doi:10.1016/s0304-3770(99)00075-3

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…Otherwise, it can be more labile like the one from Potamogeton stenostachys K. Schum, a submergent aquatic macrophyte (Farjalla et al, 1999). Aquatic macrophytes can also act as a route to release methane to the atmosphere, through the aerenchyma (Boon and Sorrell, 1995, Kulshreshtha et al, 2000, Yavitt and Knapp, 1995, but it can also be released from the sediment to the atmosphere through diffusion of dissolved methane and ebullition of gas bubbles (Neue et al, 1997). The aquatic macrophytes play an important role in methane oxidation because their roots and rhizomes promote the sediment oxygenation, which allows the development of methanotrophic bacteria responsible for the oxidation of CH 4 into CO 2 (King, 1994).…”

Section: Methanogensmentioning

confidence: 99%

Methane concentration in water column and in pore water of a coastal lagoon (Cabiúnas lagoon, Macaé, RJ, Brazil)

Fonseca

Minello

Marinho

et al. 2004

Braz. arch. biol. technol.

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The aim of this study was to evaluate methane concentration in water column and pore water at limnetic and littoral regions of a coastal lagoon. At the littoral region samples were taken from three monospecific macrophytes stands (Typha domingensis, Eleocharis interstincta and Potamogeton stenostachys). The methane concentration in the pore water at the littoral region was higher than the concentration found at the limnetic region in each fraction

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Section: Methanogensmentioning

confidence: 99%

Methane concentration in water column and in pore water of a coastal lagoon (Cabiúnas lagoon, Macaé, RJ, Brazil)

Fonseca

Minello

Marinho

et al. 2004

Braz. arch. biol. technol.

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Magnitude and variability of methane production and concentration in tropical coastal lagoons sediments

et al. 2013

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Aim: Coastal wetlands are potential zones for methane (CH 4 ) production. The present study aims to evaluate the spatial variation of CH 4 production and concentration in ten tropical coastal lagoons, the influence of aquatic macrophytes on the sediment CH 4 concentration and how the magnitude of these potential CH 4 production rates compare to those in other ecosystems. Methods: Sediments were sampled in ten coastal lagoons, with one site in the limnetic region and another site in aquatic macrophyte stands when they were present in the littoral region. We measured the CH 4 production as a potential rate, and CH 4 concentration was directly measured from sediment samples. Results: The highest potential CH 4 production (PMP) rates were found in alkaline and hypersaline lagoons. However, Cabiúnas, which is a freshwater lagoon densely colonized by aquatic macrophytes, also exhibited a high PMP rate. We also observed that the sediment CH 4 concentration in the littoral region was higher than in the limnetic region in all of the investigated lagoons except Paulista, which presented the opposite pattern. The PMP rates observed in the studied lagoons were low compared to other aquatic ecosystems. Conclusion: Our results suggest that the sediments of saline lagoons are important CH 4 production sites, and in general, aquatic macrophytes have a positive influence on methanogenesis, which was evident based on the CH 4 concentrations present in the sediments of these lagoons. Further studies should focus on the processes underlying the CH 4 patterns observed in the tropical coastal lagoons, especially concerning the coupling between CH 4 production and concentration.Resumo: Objetivo: Áreas alagadas costeiras são zonas potenciais para produção de metano (CH 4 ). O presente estudo tem como objetivo avaliar a variação espacial da produção e concentração de CH 4 em dez lagoas costeiras tropicais, a influência de macrófitas aquáticas na concentração de CH 4 no sedimento e como a magnitude dessas taxas de produção potencial de CH 4 é em comparação com outros ecossistemas. Métodos: Os sedimentos foram amostrados em dez lagoas costeiras, com um ponto na região limnética e outro ponto nos bancos de macrófita aquática, quando estas estavam presentes na região litorânea. Nós medimos a produção de CH 4 como uma taxa potencial e a concentração de CH 4 foi diretamente medida das amostras de sedimento. Resultados: As maiores taxas de produção potencial de CH 4 (PPM) foram encontradas em lagoas alcalinas e hipersalinas. Contudo, Cabiúnas, que é uma lagoa de água doce densamente colonizada por macrófitas aquáticas também exibiu alta taxa de PPM. Nós também observamos que a concentração de CH 4 do sedimento na região litorânea foi mais alta que na região limnética em todas as lagoas investigadas, exceto Paulista, que apresentou o padrão oposto. As taxas de produção de CH 4 observadas nessas lagoas estudadas foram baixas comparadas com outros ecossistemas aquáticos. Conclusão: Nossos resultados sugerem que os sedimentos de lagoas salinas são...

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Existence of micropores on the tiller surface of Schoenoplectus subalatus: the probable port for methane emission

Cited by 2 publications

References 13 publications

Methane concentration in water column and in pore water of a coastal lagoon (Cabiúnas lagoon, Macaé, RJ, Brazil)

Methane concentration in water column and in pore water of a coastal lagoon (Cabiúnas lagoon, Macaé, RJ, Brazil)

Magnitude and variability of methane production and concentration in tropical coastal lagoons sediments

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