Modeling Methane Emissions from Amazon Floodplain Ecosystems

Potter, Christopher; Mélack, John M.; Engle, Diana L.

doi:10.1007/s13157-014-0516-3

Cited by 16 publications

(13 citation statements)

References 55 publications

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“…The rate of CH 4 emission is related to the balance between the activity of methanogens and methanotrophs in the environment (Malyan et al, 2016). Although many studies showed that Amazonian floodplains are an important source of CH 4 (Ringeval et al, 2014; Potter et al, 2014; Barbosa et al, 2020), Koschorreck (2000) demonstrated that the CH 4 emission rates may decrease to zero when the sediments become exposed to air. In fact, we observed a decrease of mcr A: pmo A ratios during the dry season in all areas.…”

Section: Discussionmentioning

confidence: 99%

“…While uplands forests are considered important tropical methane (CH 4 ) sinks, floodplains represent the largest natural sources of CH 4 into the atmosphere (Conrad, 2009; Meyer et al 2017; Gedney et al, 2019), including the significant process of CH 4 transfer through trees (Pangala et al, 2017). Modelling studies have predicted that Amazonian floodplains may contribute up to 7% of total global CH 4 emissions (Potter, Melack & Engle, 2014; Wilson et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Seasonal dynamics of methane cycling microbial communities in Amazonian floodplain sediments

Gontijo

Venturini

Yoshiura

et al. 2020

Preprint

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39The Amazonian floodplain forests are dynamic ecosystems of great importance for the regional 40 hydrological and biogeochemical cycles and provide a significant contribution to the global 41 carbon balance. Unique geochemical factors may drive the microbial community composition 42 and, consequently, affect CH4 emissions across floodplain areas. Here we provide the first 43 report of the in situ seasonal dynamics of CH4 cycling microbial communities in Amazonian 44 floodplains. We asked how abiotic factors may affect both overall and CH4 cycling microbial 45 communities and further investigated their responses to seasonal changes. We collected 46 sediment samples during wet and dry seasons from three different types of floodplain forests, 47 along with upland forest soil samples, from the Eastern Amazon, Brazil. We used high-48 resolution sequencing of archaeal and bacterial 16S rRNA genes combined with real-time PCR 49 to quantify Archaea and Bacteria, as well as key functional genes indicative of the 50 methanogenic (methyl coenzyme-M reductase -mcrA) and methanotrophic (particulate51 methane monooxygenase -pmoA) metabolisms. Methanogens were found to be present in 52 high abundance in floodplain sediments and they seem to resist to dramatic seasonal 53 environmental changes. Methanotrophs known to use different pathways to oxidise CH4 were 54 3 detected, including anaerobic archaeal and bacterial taxa, indicating that a wide metabolic 55 diversity may be harboured in this highly variable environment. The floodplain environmental 56 variability, which is affected by the river origin, drives not only the sediment chemistry, but also 57 the composition of the microbial communities. The results presented may contribute to the 58 understanding of the current state of CH4 cycling in this region. 59 60 Quantitative PCR. 62 63 65 et al. , 2015). These ecosystems comprise diversified and dynamic landscapes, which are 66 exposed to seasonal flooding events by the expanding rivers, as a consequence of the periodic 67 excessive rainfalls. Floodplains seem to play a significant role in the regional and global C 68 72 significant process of CH4 transfer through trees (Pangala et al., 2017). Modelling studies have 73 predicted that Amazonian floodplains may contribute up to 7% of total global CH4 emissions 74 (Potter, Melack & Engle, 2014; Wilson et al., 2016). 75In anoxic environments, the CH4 is generated as the final product of the anaerobic 76 respiration by methanogenic archaea, which can use acetate, H2/CO2, formate, CO, or 77 methylated compounds as substrates (Bridgham, Cadillo-Quiroz, Keller & Zhuang, 2013). The 78 ability to use one or more substrates varies across the different methanogenic archaea taxa. 79 Hence, substrate availability, along with other factors (biotic and abiotic), affects the diversity 80 of these organisms in the environment (Barros et al., 2019).81 103 scales. For instance, the riverine origin is a very important factor, as some waters may carry 104 large amounts of inorganic suspensoids, s...

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Seasonal dynamics of methane cycling microbial communities in Amazonian floodplain sediments

Gontijo

Venturini

Yoshiura

et al. 2020

Preprint

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“…In the same year, Potter et al [76] developed a new model that sought to seasonally estimate the carbon dynamics and CH 4 emission of floodable ecosystems in the Amazon. The Amazon wetland simulation model took into account three main components: (a) details of the type of vegetation in the wetlands and changes in the level of water, temperature, and dissolved oxygen; (b) primary production, mass accumulation, and decay of the litter layer in soils and sediments; and (c) routes for production and transport of CH 4 through the water column to the atmosphere.…”

Section: Modeling Of Ch 4 Emissionmentioning

confidence: 99%

Methane, Microbes and Models in Amazonian Floodplains: State of the Art and Perspectives

Barros¹,

Bento²,

Ferreira³

et al. 2020

Changing Ecosystems and Their Services

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Amazon floodplain ecosystems include open water and intermittent flood forest and agricultural systems with different water types. They are a significant natural source of methane (CH 4) in the tropics. When soils are flooded and become anoxic, CH 4 is produced by methanogenesis, while microbially mediated aerobic and anaerobic oxidation of CH 4 serves as the primary biological sink of this greenhouse gas. Measurements of rates and controls on CH 4 production and emission in the Amazon basin mainly come from studies on individual wetlands and floodplain lakes. Similarly, microbial communities in those Amazon floodplain habitats have been studied on individual lakes based on sequence-specific DNA analysis. Existing biogeochemical ecosystem models of CH 4 from the Amazon floodplains focus on soil properties or involve factors such as pH, redox potentials, or substrates. None of these models incorporate appropriate seasonal inundation; neither the microbiota does it as a component. In this sense, our chapter will highlight how the important efforts already contributed to understand the CH 4 emission and its connections with abiotic and biotic factors in Amazon floodplains, as well as emphasize the need of encouraging cooperation and exchange of experience between research teams by using different approaches and scientific methods.

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“…Apart from the Table 6. Estimation of annual methane release due to decomposition of fresh aboveground plant litter on the basis of annual biomass production determined for rewetted fens in the River Peene valley (Steffenhagen et al, 2012;Zak et al, 2014) decomposition of fresh detritus organic matter, the older accumulated detritus material might contribute to CH 4 production in the course of sediment diagenetic processes as well as the consumption of dead root material and organic compounds leached from roots (Potter et al, 2014). Other variables which influence the in situ methane emissions include: (i) oxygen release in the rhizosphere of emergent helophytes so that a major part of the produced CH 4 may become oxidised, (ii) the methane transport through plant aerenchyma, (iii) seasonal and spatial changes of temperature as well as methanogen or methanotroph community and (iv) the water quality, i.e.…”

Section: Implications For Peatland Restorationmentioning

confidence: 99%

Changes of the CO<sub>2</sub> and CH<sub>4</sub> production potential of rewetted fens in the perspective of temporal vegetation shifts

et al. 2015

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Abstract. Rewetting of long-term drained fens often results in the formation of eutrophic shallow lakes with an average water depth of less than 1 m. This is accompanied by a fast vegetation shift from cultivated grasses via submerged hydrophytes to helophytes. As a result of rapid plant dying and decomposition, these systems are highly dynamic wetlands characterised by a high mobilisation of nutrients and elevated emissions of CO 2 and CH 4 . However, the impact of specific plant species on these phenomena is not clear. Therefore we investigated the CO 2 and CH 4 production due to the subaqueous decomposition of shoot biomass of five selected plant species which represent different rewetting stages (Phalaris arundinacea, Ceratophyllum demersum, Typha latifolia, Phragmites australis and Carex riparia) during a 154 day mesocosm study. Beside continuous gas flux measurements, we performed bulk chemical analysis of plant tissue, including carbon, nitrogen, phosphorus and plant polymer dynamics. Plant-specific mass losses after 154 days ranged from 25 % (P. australis) to 64 % (C. demersum). Substantial differences were found for the CH 4 production with highest values from decomposing C. demersum (0.4 g CH 4 kg −1 dry mass day) that were about 70 times higher than CH 4 production from C. riparia. Thus, we found a strong divergence between mass loss of the litter and methane production during decomposition. If C. demersum as a hydrophyte is included in the statistical analysis solely nutrient contents (nitrogen and phosphorus) explain varying greenhouse gas production of the different plant species while lignin and polyphenols demonstrate no significant impact at all. Taking data of annual biomass production as important carbon source for methanogens into account, high CH 4 emissions can be expected to last several decades as long as inundated and nutrient-rich conditions prevail. Different restoration measures like water level control, biomass extraction and top soil removal are discussed in the context of mitigation of CH 4 emissions from rewetted fens.

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Modeling Methane Emissions from Amazon Floodplain Ecosystems

Cited by 16 publications

References 55 publications

Seasonal dynamics of methane cycling microbial communities in Amazonian floodplain sediments

Seasonal dynamics of methane cycling microbial communities in Amazonian floodplain sediments

Methane, Microbes and Models in Amazonian Floodplains: State of the Art and Perspectives

Changes of the CO<sub>2</sub> and CH<sub>4</sub> production potential of rewetted fens in the perspective of temporal vegetation shifts

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Modeling Methane Emissions from Amazon Floodplain Ecosystems

Cited by 16 publications

References 55 publications

Seasonal dynamics of methane cycling microbial communities in Amazonian floodplain sediments

Seasonal dynamics of methane cycling microbial communities in Amazonian floodplain sediments

Methane, Microbes and Models in Amazonian Floodplains: State of the Art and Perspectives

Changes of the CO&lt;sub&gt;2&lt;/sub&gt; and CH&lt;sub&gt;4&lt;/sub&gt; production potential of rewetted fens in the perspective of temporal vegetation shifts

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Changes of the CO<sub>2</sub> and CH<sub>4</sub> production potential of rewetted fens in the perspective of temporal vegetation shifts