Influence of salinity on methanogenesis and associated microflora in tropical rice soils

Pattnaik, Priyabrata; Mishra, Seema; Kollah, Bharati; Mohanty, SK; Sethunathan, N.; Adhya, T. K.

doi:10.1016/s0944-5013(00)80035-x

Cited by 43 publications

(25 citation statements)

References 15 publications

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“…In various habitats methane production activity was negatively correlated with salinity (Bartlett et al, 1987; Potter et al, 2009; Poffenbarger et al, 2011). The inhibition of methane production through salinity is thereby suggested to coincide with a reduced methanogenic population size (Pattnaik et al, 2000). The effect of salinity on hydrogenotrophic, acetotrophic and methylotrophic methanogenesis thereby depends on the level of salinity and is different for the different pathways of methanogenesis (Liu et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

Global Biogeographic Analysis of Methanogenic Archaea Identifies Community-Shaping Environmental Factors of Natural Environments

Yang

Horn

et al. 2017

Front. Microbiol.

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Methanogenic archaea are important for the global greenhouse gas budget since they produce methane under anoxic conditions in numerous natural environments such as oceans, estuaries, soils, and lakes. Whether and how environmental change will propagate into methanogenic assemblages of natural environments remains largely unknown owing to a poor understanding of global distribution patterns and environmental drivers of this specific group of microorganisms. In this study, we performed a meta-analysis targeting the biogeographic patterns and environmental controls of methanogenic communities using 94 public mcrA gene datasets. We show a global pattern of methanogenic archaea that is more associated with habitat filtering than with geographical dispersal. We identify salinity as the control on methanogenic community composition at global scale whereas pH and temperature are the major controls in non-saline soils and lakes. The importance of salinity for structuring methanogenic community composition is also reflected in the biogeography of methanogenic lineages and the physiological properties of methanogenic isolates. Linking methanogenic alpha-diversity with reported values of methane emission identifies estuaries as the most diverse methanogenic habitats with, however, minor contribution to the global methane budget. With salinity, temperature and pH our study identifies environmental drivers of methanogenic community composition facing drastic changes in many natural environments at the moment. However, consequences of this for the production of methane remain elusive owing to a lack of studies that combine methane production rate with community analysis.

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Section: Discussionmentioning

confidence: 99%

Global Biogeographic Analysis of Methanogenic Archaea Identifies Community-Shaping Environmental Factors of Natural Environments

Yang

Horn

et al. 2017

Front. Microbiol.

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“…In field studies, SO 4 2À concentrations as low as 10 mg/L have been shown to inhibit methanogenesis, while a meta-analysis along natural salinity gradients identified 4 mM SO 4 2À (386 mg/L or the equivalent of 5 psu seawater) as a threshold between low porewater CH 4 concentrations (,25 lM CH 4 ) and higher levels (up to .500 lM CH 4 ; Poffenbarger et al 2011). Nevertheless, Na þ and Cl À alone can significantly inhibit methanogenesis in inland systems (Pattnaik et al 2000, Mishra et al 2003, Baldwin et al 2006). These results suggest that methanogen populations along salinity gradients may adapt or migrate in response to salinity exposure, while those experiencing a novel exposure are more sensitive (further considered in Microbial assemblages below).…”

Section: Biogeochemical Cyclingmentioning

confidence: 99%

“…In inland systems, Hart et al (1991) reported that cyanobacteria are inhibited by highly variable salinity but may adapt to gradual increases. Observations suggest that Na þ and Cl À alone, without a concomitant increase in SO 4 2À , can inhibit methanogenesis in inland, but not coastal, systems (Pattnaik et al 2000, Mishra et al 2003, Baldwin et al 2006, Chambers et al 2011. One explanation of this difference is that methanogens in inland systems are not adapted to periodic saltwater intrusion and thus succumb to direct ionic effects of increased salinity.…”

Section: Wetland Biotamentioning

confidence: 99%

A global perspective on wetland salinization: ecological consequences of a growing threat to freshwater wetlands

et al. 2015

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Abstract. Salinization, a widespread threat to the structure and ecological functioning of inland and coastal wetlands, is currently occurring at an unprecedented rate and geographic scale. The causes of salinization are diverse and include alterations to freshwater flows, land-clearance, irrigation, disposal of wastewater effluent, sea level rise, storm surges, and applications of de-icing salts. Climate change and anthropogenic modifications to the hydrologic cycle are expected to further increase the extent and severity of wetland salinization. Salinization alters the fundamental physicochemical nature of the soil-water environment, increasing ionic concentrations and altering chemical equilibria and mineral solubility. Increased concentrations of solutes, especially sulfate, alter the biogeochemical cycling of major elements including carbon, nitrogen, phosphorus, sulfur, iron, and silica. The effects of salinization on wetland biogeochemistry typically include decreased inorganic nitrogen removal (with implications for water quality and climate regulation), decreased carbon storage (with implications for climate regulation and wetland accretion), and increased generation of toxic sulfides (with implications for nutrient cycling and the health/functioning of wetland biota). Indeed, increased salt and sulfide concentrations induce physiological stress in wetland biota and ultimately can result in large shifts in wetland communities and their associated ecosystem functions. The productivity and composition of freshwater species assemblages will be highly altered, and there is a high potential for the disruption of existing interspecific interactions. Although there is a wealth of information on how salinization impacts individual ecosystem components, relatively few studies have addressed the complex and often non-linear feedbacks that determine ecosystem-scale responses or considered how wetland salinization will affect landscape-level processes. Although the salinization of wetlands may be unavoidable in many cases, these systems may also prove to be a fertile testing ground for broader ecological theories including (but not limited to): investigations into alternative stable states and tipping points, trophic cascades, disturbance-recovery processes, and the role of historical events and landscape context in driving community response to disturbance.

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“…In sulfate rich environments methanogenic bacteria become outcompeted for organic substrates by sulfate reducing bacteria (Capone and Kiene 1988;Scholten and Stams 1995;Smolders et al 2002, Lamers et al 2013. Apart from reduced methanogenic activity caused by sulfate reduction, other studies also report osmotic stress leading to altered microbiological communities after salinization influencing biogeochemical cycles (Rysgaard et al 1999;Pattnaik et al 2000;Mishra et al 2003;Baldwin et al 2006;Chambers et al 2011).…”

Section: Effect On Decompositionmentioning

confidence: 99%

Salinization of coastal freshwater wetlands; effects of constant versus fluctuating salinity on sediment biogeochemistry

et al. 2015

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Globally, coastal lowlands are becoming more saline by the combined effects of sea level rise, land subsidence and altered hydrological and climatic conditions. Although salinization is known to have a great influence on biogeochemical processes, literature shows contrasting effects that challenge the prediction of future effects. In addition, the effects of fluctuating salinity levels, a more realistic scenario than constant levels, on nutrient cycling in coastal wetland sediments have hardly been examined. A better understanding is therefore crucial for the prediction of future effects and the definition of effective management. To test the effects of constantly brackish water (50 mmol Cl l -1 , 3.2 psu) or fluctuating salinity (5-50 mmol Cl l -1 ), versus constantly low salinity (5 mmol Cl l -1 , 0.32 psu) on nutrient biogeochemistry, we conducted a controlled laboratory experiment with either peat or clay sediments from coastal wetlands. Increased salinity showed to have a fast and large effect. Sediment cation exchange appeared to be the key process explaining both a decrease in phosphorus availability (through calcium mobilization) and an increase in nitrogen availability, their extent being strongly dependent on sediment type. Supply of brackish water decreased surface water turbidity and inhibited sediment methane production but did not affect CO 2 production. Constant and fluctuating salinity levels showed similar longer term effects on nutrient and carbon cycling. The contrasting effects of salinization found for nitrogen and phosphorus, and its effects on water turbidity indicate major ecological consequences for coastal wetlands and have important implications for water management and nature restoration.

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Influence of salinity on methanogenesis and associated microflora in tropical rice soils

Cited by 43 publications

References 15 publications

Global Biogeographic Analysis of Methanogenic Archaea Identifies Community-Shaping Environmental Factors of Natural Environments

Global Biogeographic Analysis of Methanogenic Archaea Identifies Community-Shaping Environmental Factors of Natural Environments

A global perspective on wetland salinization: ecological consequences of a growing threat to freshwater wetlands

Salinization of coastal freshwater wetlands; effects of constant versus fluctuating salinity on sediment biogeochemistry

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