Dissolved organic carbon cycling, methane emissions and related microbial populations in temperate rice paddies with contrasting straw and water management

Bertora, Chiara; Cucu, Maria Alexandra; Lerda, Cristina; Peyron, Matteo; Bardi, Laura; Gorra, Roberta; Sacco, Dario; Celi, Luisella; Said-Pullicino, Daniel

doi:10.1016/j.agee.2018.06.004

Cited by 43 publications

(21 citation statements)

References 58 publications

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“…Since also Fe reduction was stimulated upon the addition of maize (Fig. 2), it seems likely that, next to stimulated SOC fermentation, indeed promoted SOC co-release upon enhanced Fe reduction was a potentially important priming mechanism, in agreement with the observations of Ye and Horwath (2017) and Bertora et al (2018). Dissolution of all Fe-bound SOC present might produce a DOC peak of approximately 584 mg C kg -1 (Balina) or 854 mg C kg -1 (Sonatala), when roughly comparing it to the DOC production and DOC mineralisation kinetics of maize (where we know that 1898 mg added maize-C kg -1 yielded a peak of 811 mg C kg -1 maize-derived DOC).…”

Section: Are Fe Reduction and Soc Dissolution Linked?supporting

confidence: 83%

Effect of organic carbon addition on paddy soil organic carbon decomposition under different irrigation regimes

Deroo¹,

Akter²,

Bodé³

et al. 2021

Preprint

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Abstract. Anaerobic decomposition of organic carbon (OC) in submerged rice paddies is coupled to the reduction of alternative soil electron acceptors, primarily Fe3+. During reductive dissolution of Fe3+ from pedogenic oxides, previously adsorbed native soil organic carbon (SOC) could be co-released into solution. Incorporation of crop residues could hence indirectly, i.e. through the stimulation of microbially mediated Fe3+ reduction, promote the loss of native SOC via enhanced dissolution and subsequent mineralisation to CO2 and CH4. Our aim was to estimate the relevance of such a positive feedback during the degradation of added OC, and to investigate the impact of irrigation management on this mechanism and on priming effects on native SOC decomposition in general. In a six-week pot experiment with rice plants, two Bangladeshi soils with contrasting SOC-to-reducible-Fe (SOC : Feox) ratios were kept under a regime of alternate wetting and drying (AWD) or continuous flooding (CF), and were either amended with maize shoots or not. The δ13C signatures of dissolved organic C and emitted CH4 and CO2 were used to infer the decomposition of added maize shoots (δ13C = −13.0 ‰) versus native SOC (δ13C = −25.4 ‰ and −22.7 ‰). Addition of maize residues stimulated the reduction of Fe as well as the dissolution of native SOC, and the latter to a larger extent under CF, especially for the soil with the highest SOC : Feox ratio. Estimated Fe-bound SOC contents denote that stimulated SOC co-release during Fe reduction could explain this positive priming effect on SOC dissolution after the addition of maize. However, priming effects on SOC mineralisation to CO2 and CH4 were lower than for SOC dissolution, and were even negative under AWD for one soil. Enhanced reductive dissolution of Fe-bound SOC upon exogenous OC addition therefore does not necessarily lead to stimulated SOC mineralisation. In addition, AWD irrigation was found to decrease abovementioned priming effects.

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Section: Are Fe Reduction and Soc Dissolution Linked?supporting

confidence: 83%

Effect of organic carbon addition on paddy soil organic carbon decomposition under different irrigation regimes

Deroo¹,

Akter²,

Bodé³

et al. 2021

Preprint

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“…Among them, EOC is the main carbon source, indicating the potential of soil carbon decomposition under anaerobic conditions, and methanogens can use this source to produce CH 4 . MBC is highly related to the number of soil microorganisms, and the contents of EOC and MBC directly affect the CH 4 and CO 2 emissions of rice fields 58‐61 . In this experiment, we found significant positive correlations between MBC and CH 4 emission and between EOC and CO 2 emission.…”

Section: Discussionsupporting

confidence: 50%

Effects of UV‐B radiation on soil carbon conversion and greenhouse gas emission in paddy soil

Liang

et al. 2020

Greenhouse Gases

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This paper evaluates the relationship between ultraviolet-B (UV-B, 280-315 nm) radiation enhancement on the earth's surface caused by ozone attenuation and climate change. A pot experiment was conducted to investigate the effects of enhanced UV-B radiation on greenhouse gas (GHG) emissions from the paddy soil with rice straw incorporation (SI). The paddy soil was sampled from the Yuanyang Terrace, Yunnan Province, Southwest China. There were four treatments: natural light (control check, CK), 5.0 kJ•m −2 UV-B radiation (UVB), SI, and SI + UVB. The effects of UV-B radiation (5.0 kJ•m −2) on straw degradation, soil carbon invertase activity, active organic carbon content, and GHG emissions were studied. The results showed that UV-B radiation promoted the degradation of straw components (lignin, cellulose, hemicellulose, and water-soluble phenol). The SI treatment significantly increased the activity of soil carbon invertase (P < 0.05), the content of soil active organic carbon (P < 0.05), and the emission rates and amounts of GHGs (P < 0.05). Compared to the SI treatment, SI + UVB treatment reduced soil carbon invertase activity and active organic carbon content, resulting in a 17% reduction in CH 4 emission and a 40% and 16% increase in CO 2 and N 2 O emission (P < 0.05), but had no significant effect on the global warming potential (GWP). Correlation analysis showed that the degradation rate of straw components was positively correlated with the activity of carbon invertase, the contents of microbial biomass carbon (MBC), easily oxidized organic carbon (EOC), and the CO 2 emission rate; the activities of sucrase and cellulase were positively correlated with the contents of MBC and EOC, which were in turn positively correlated with the emission rates of CH 4 and CO 2. Under SI, UV-B radiation reduced the soil carbon conversion, which led to a decreased CH 4 emission and increased emissions of CO 2 and N 2 O, but did not alter the GWP of GHGs from the paddy soil.

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“…PARAFAC analysis of the EEM spectra was performed using the DOMFluor toolbox in MATLAB v7.0 (Mathworks, Natick, MA, USA), as described by Stedmon and Bro [26]. The humification index (HIX) was used to evaluate the humification extent of the DOM [39].…”

Section: Discussionmentioning

confidence: 99%

“…Soil DOM composition is complex, including plant and animal residues, semi-decomposed organic materials, and stable humic acids [24]. Numerous studies have evaluated soil DOM quantity based on dissolved organic C (DOC) concentrations [25,26]. Few studies have explored the molecular properties of soil DOM because of the limited analytical approaches available [27].…”

Section: Introductionmentioning

confidence: 99%

Quantitative and Qualitative Responses of Soil Water-Extractable Organic Matter to Carbon and Nitrogen Management Practices in Loess Soil

Qin

Chai

et al. 2021

Agronomy

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Soil-dissolved organic matter (DOM) drives the carbon (C) and nitrogen (N) cycles in agroecosystems. Despite many studies on DOM dynamics, hardly any attention has been directed toward DOM quality, particularly DOM composition. The aim of this study was to elucidate how C and N management practices alter soil water-extractable organic matter (WEOM) in a loess soil agroecosystem. Field experiments were conducted with a winter wheat monoculture. Three N fertilization rates (0, 120, and 240 kg ha−1 year−1) were applied for 17 years (2002–2019), combined with five C practices (zero, low, and high rates of sheep manure or wheat straw) for three years (2016–2019). The results reveal that soil organic carbon (SOC) and water-extractable organic carbon (WEOC) concentrations in the topsoil (0–20 cm) were increased by organic amendments considerably but were not affected by N fertilization. The fluorescence excitation–emission matrix spectra (EEM) of WEOM were resolved to two humic-like components (C1 and C2) and two soluble microbial byproduct-like components (C3 and C4). The proportions of C1 and C2 were increased, while the proportion of C3 was decreased by both C and N management practices. In conclusion, organic amendments increased both WEOM quality and its proportion of humic-like components, whereas N fertilization increased the proportion of humic-like components without variations of WEOM quality in the topsoil of loess soil.

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Dissolved organic carbon cycling, methane emissions and related microbial populations in temperate rice paddies with contrasting straw and water management

Cited by 43 publications

References 58 publications

Effect of organic carbon addition on paddy soil organic carbon decomposition under different irrigation regimes

Effect of organic carbon addition on paddy soil organic carbon decomposition under different irrigation regimes

Effects of UV‐B radiation on soil carbon conversion and greenhouse gas emission in paddy soil

Quantitative and Qualitative Responses of Soil Water-Extractable Organic Matter to Carbon and Nitrogen Management Practices in Loess Soil

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