Response of anaerobic carbon cycling to water table manipulation in an Alaskan rich fen

Kane, Evan S.; Chivers, Mark; Turetsky, M. R.; Treat, Claire C.; Petersen, Dorthe Groth; Waldrop, Mark P.; Harden, Jennifer W.; McGuire, A. David

doi:10.1016/j.soilbio.2012.10.032

Cited by 57 publications

(40 citation statements)

References 80 publications

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“…divided by the weight (g) of the dry mass sample incubated in each bottle (ml CH 4 g -1 d.m.). Methane production rates were calculated from the slope of the relationship (R 2 > 0.93) between the cumulative methane volume and incubation time (Kane et al, 2013). Moreover, daily changes in methane production were calculated by simply dividing the increase in the methane volume with time between adjacent measurements.…”

Section: Methodsmentioning

confidence: 99%

Methanogenic community composition in an organic waste mixture in an anaerobic bioreactor

Gryta¹,

Oszust²,

Brzezińska³

et al. 2017

International Agrophysics

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A b s t r a c t. The aim of the study was to elucidate the substantial relationship between the compositions of methanogen community that assembles in the anaerobic digester mass and link it to methane production activity. The results of the metagenomic studies were used to evaluate how the methanogen structure changes during an anaerobic digestion process under various waste retention times (21, 23, 25, 29, 33, 39, 47 and 61 days). Phylogenetically coherent populations of methanogens were assessed by 16S rRNA gene next-generation sequencing and terminal restriction fragment length polymorphism fingerprinting of a specific molecular marker, the mcrA gene. The results indicated multiple phylogenetically diverse methanogen populations associated with the various steps of anaerobic digestion. The stages of the anaerobic digestion process and waste retention times determine the microbial composition. The most dominant and acclimated microbial communities in all samples belonged to the genera Methanosaeta and Methanobacterium. The methane yield was consistent with the results of the microbial community structure, which indicated that acetotrophic Methanosaeta was the most active and most important during the methanogenic stage.K e y w o r d s: anaerobic digestion, methanogenic activity, methanogenic Archaea, NGS, t-RFLP

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Section: Methodsmentioning

confidence: 99%

Methanogenic community composition in an organic waste mixture in an anaerobic bioreactor

Gryta¹,

Oszust²,

Brzezińska³

et al. 2017

International Agrophysics

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“…When the oxygen level was reduced, they switched to an oxidase that transferred only one proton per electron, but had a high affinity for oxygen. When soil oxygen content decreases to low levels, the metabolic pathway changes from aerobic respiration to anaerobic fermentation and the products change from CO 2 to CH 4 (Bridgham and Richardson, 1992;Kane et al, 2013;Fan et al, 2014). Therefore, soil CO 2 efflux decreases dramatically when soils are flooded, such as in wetlands (Krauss et al, 2012;Liu and Xu, 2015).…”

Section: Soil Oxygen Contentmentioning

confidence: 99%

Contribution of soil respiration to the global carbon equation

Shang

2016

Journal of Plant Physiology

160

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a b s t r a c tSoil respiration (Rs) is the second largest carbon flux next to GPP between the terrestrial ecosystem (the largest organic carbon pool) and the atmosphere at a global scale. Given their critical role in the global carbon cycle, Rs measurement and modeling issues have been well reviewed in previous studies. In this paper, we briefly review advances in soil organic carbon (SOC) decomposition processes and the factors affecting Rs. We examine the spatial and temporal distribution of Rs measurements available in the literature and found that most of the measurements were conducted in North America, Europe, and East Asia, with major gaps in Africa, East Europe, North Asia, Southeast Asia, and Australia, especially in dry ecosystems. We discuss the potential problems of measuring Rs on slope soils and propose using obliquely-cut soil collars to solve the existing problems. We synthesize previous estimates of global Rs flux and find that the estimates ranged from 50 PgC/yr to 98 PgC/yr and the error associated with each estimation was also high (4 PgC/yr to 33.2 PgC/yr). Using a newly integrated database of Rs measurements and the MODIS vegetation map, we estimate that the global annual Rs flux is 94.3 PgC/yr with an estimation error of 17.9 PgC/yr at a 95% confidence level. The uneven distribution of Rs measurements limits our ability to improve the accuracy of estimation. Based on the global estimation of Rs flux, we found that Rs is highly correlated with GPP and NPP at the biome level, highlighting the role of Rs in global carbon budgets.

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“…DOC also was driven by temperature rising (Freeman et al, 2001b). O 2 deficiency inhibited Rs (Freeman et al, 2001a;Mettrop et al, 2014) and O 2 could accelerate SOM decomposition (Blodau and Moore, 2003;Fenner and Freeman, 2011;Kane et al, 2013;Moore and Knowles, 1989;Oechel et al, 1998). In saturated peatlands, water not only displaces air from soil pores, but also hinders gas exchange between soil and atmosphere (Minkkinen et al, 2007).…”

Section: Effects Of Temperature and Oxygenmentioning

confidence: 99%

“…In saturated peatlands, water not only displaces air from soil pores, but also hinders gas exchange between soil and atmosphere (Minkkinen et al, 2007). Water table drawdown, however, supplies soil porosity for gas diffusion, permitting O 2 to increase Rs by being the terminal electron acceptor during Rs (Kane et al, 2013;Keller and Takagi, 2013;Kristensen and Holmer, 2001). At the same time, the difference of Q 10 values under AE and AN conditions also demonstrated that soil carbon became more liable to microbes under O 2 abundant environment (Lee et al, 2012;Wang et al, 2013).…”

Section: Effects Of Temperature and Oxygenmentioning

confidence: 99%