Methane production in Santa Barbara basin sediments

Warford, Ann L.; Kosiur, David R.; Doose, Paul R.

doi:10.1080/01490457909377728

Cited by 30 publications

(10 citation statements)

References 20 publications

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“…Highest rates in the topsoil samples might be attributed to a subsurface pool c labile carbon, as found in the top of Jamaican mangrove soils (Nedwell et al, 1994 Overall the values are similar to those found for other marine mangroves investigated so far (Sotomayor et al, 1994), but considerably higher than those found for marine surfae sediments and saltmarsh soils of higher latitudes, in which methane production rates of less than 1 nmol ml -2 d -1 have been measured (Warford et al, 1979;Senior et al 1982).…”

Section: Methanogenesissupporting

confidence: 52%

Characteristics and methanogenesis of the Balandra lagoon mangrove soils, Baja California Sur, Mexico

Giani

Bashan²,

Holguín³

et al. 1996

Geoderma

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Soil characteristics and methanogenesis were investigated in Fluvisols of the Balandra lagoon mangrove in Baja California, Mexico in March/April 1995.The grain size distribution was dominated by the silt fraction (54-92%), sand and clay contents were 6-44% and 0-19%, respectively. Bulk density was 0.6-1.5 g cm -3 , the water content 290-690 ml 1 -1 and the air content 38-200 ml 1 -1 . The soils always showed saline conditions (30-70 g kg -1 ), mostly negative redox potentials (down to -202 mV), P contents from 0.8 to 16.0 g kg -1 , Corg contents from <2 to 140 g kg -1 and neutral pH values. In one soil the pH dropped < 2,5 after peroxide treatment indicating, together with low carbonate/pyrite ratios (mostly < 3) sulfidic properties. The relative distribution of the porewater canons was always 74% Na, 17% Mg, 6% Ca, and 3% K. For the exchangeable and water soluble cation fraction it was 28-59% Na, 22-34% Mg, 12-32% Ca, and 2-5% K, with increasing Na-and decreasing Ca-concentrations in the transect from sea to land.The methane concentrations were mostly lower than 2 µM. Methane production rates were between 1 and 23 nmol ml -1 d -1 . Methane emission was not detectable. This indicates, that methanogenesis is balanced by methane oxidation processes within the soil. Higher methane concentrations (33 µM) and production rates (100 nmol ml -1 d -1 ) in one of the investigated soils were attributed to anthropogenic impact. Consequently, in case of human manipulation the potential of mangrove soils to emit methane seems to be high, thus mangroves are sensitive with respect to methanogenesis.

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Section: Methanogenesissupporting

confidence: 52%

Characteristics and methanogenesis of the Balandra lagoon mangrove soils, Baja California Sur, Mexico

Giani

Bashan²,

Holguín³

et al. 1996

Geoderma

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“…Recent, direct analyses of rates of methanogenesis and sulfate reduction have, for the most part, substantiated earlier conclusions, and where high concentrations of sulfate are present, as in marine sediments, anaerobic respiration is dominated by sulfate reduction (Tables 2 and 3; Oremland and Taylor 1978;Jorgensen 1982). However, recent evidence indicates that low but measurable rates of methane production do occur in sulfate-containing marine sediments which exhibit sulfate respiration (Table 2 ;Oremland 1975;Oremland and Taylor 1978;Warford et al 1979;Gunnarsson and Ronnow 1982;Kiene and Capone 1984). In most sediments containing > 1 mM SOh2-, methane production accounts for only a small percentage (CO. 1%) of anaerobic metabolism (Table 2; Winfrey and Ward 1983;Senior et al 1982).…”

Section: Sulfate Respiration and Methanogenesis-mentioning

confidence: 52%

Comparison of microbial dynamics in marine and freshwater sediments: Contrasts in anaerobic carbon catabolism

Capone¹,

KIENE²

1988

Limnol. Oceangr.

386

322

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The microbiota of freshwater and marine sediments serve similar roles in carbon degradation and nutrient regeneration. However, because of differences in the chemical environment between freshwater and marine systems, distinct physiological groups of bacteria dominate terminal carbon catabolism in each system. In general, the distribution and rates of microbial activities within a sediment are determined by availability of electron acceptors for respiration and metabolizable organic substrates.Sulfate ion is a primary factor in the distribution of microbial activities in anoxic sediments. At

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“…It is likely that the maximum concentration we report here is not the actual maximum for the site, as methane maxima usually occur close to the base of the sulfate reduction zone (approximately 2 mbsf, see below), a depth interval for which we have no methane data. Maximum methane concentrations of 9500, 12,300, and 10,700 µmol/L have been recorded at 2.7, 3.8, and 5.7 mbsf, respectively, in SBB sediments (Barnes and Goldberg, 1976;Warford et al, 1979;Kosiur and Warford, 1979;Doose and Kaplan 1981). These were related to pore water concentrations of sulfate, which decreased from 27.6 mmol/L at the surface to 0 between 1.5-2 mbsf Doose and Kaplan, 1981), concomitant with an increase in reduced sulfur species Schimmelmann and Kastner, 1993).…”

Section: Resultsmentioning

confidence: 99%

Bacterial Profiles in Deep Sediments of the Santa Barbara Basin, Site 893

Cragg¹,

Parkes²,

Fry³

et al. 1995

Proceedings of the Ocean Drilling Program

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Bacterial depth profiles were obtained from high-organic-load sediments (water depth 538 m) to a depth of 68.28 m below seafloor. Using the Acridine Orange Direct Count (AODC) technique, near-surface bacterial populations were 1.27 × 10 9 cells/ cm 3 . Numbers of bacteria decreased rapidly to 4.77 × 10 6 cells/cm 3 at 12 mbsf and then more slowly to 2.51 × 10 6 cells/cm 3 at 68.28 mbsf (505-fold decrease). Dividing cells represented approximately 10% of the total count but decreased at a greater rate (850-fold). There was an abrupt change in the rate of total bacterial population decrease at approximately 13 mbsf. Bacterial numbers were strongly correlated (P « 0.002) with total organic carbon. Near-surface concentrations of organic carbon rapidly decreased from approximately 3.6% to 2.0% at 13 mbsf, and thereafter remained at 1.5%-2.0% to the base of the core at 68.28 mbsf, indicating a high level of recalcitrance. The changes in the rate of bacterial population decrease with depth may be a response to increasingly recalcitrant organic carbon. High levels of methane (4100 µmol/L) were found at 9.0 mbsf, although the maximum concentration present in the sediment at this site may be in an unsampled horizon above this depth. At greater depth, methane concentrations were still high (>IOOO µmol/L), and although this area has many seeps of oil and gas, the C|/C 2+ ratios indicate a biogenic rather than a fhermogenic source.This work represents the first detailed microbiological analysis of deep sediment layers from the Santa Barbara Basin.

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Methane production in Santa Barbara basin sediments

Cited by 30 publications

References 20 publications

Characteristics and methanogenesis of the Balandra lagoon mangrove soils, Baja California Sur, Mexico

Characteristics and methanogenesis of the Balandra lagoon mangrove soils, Baja California Sur, Mexico

Comparison of microbial dynamics in marine and freshwater sediments: Contrasts in anaerobic carbon catabolism

Bacterial Profiles in Deep Sediments of the Santa Barbara Basin, Site 893

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