Oxygen availability determines key regulators in soil organic carbon mineralisation in paddy soils

Li, Yuhong; Shahbaz, Muhammad; Zhu, Zhenke; Deng, Yulin; Tong, Yaoyao; Chen, Liang; Wu, Jinshui; Ge, Tida

doi:10.1016/j.soilbio.2020.108106

Cited by 52 publications

(16 citation statements)

References 81 publications

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“…Oxygen availability has gained growing attention for its role in regulating C dynamics (Chen et al, 2011; Huang et al, 2021; Keiluweit et al, 2016) because it can exert cascading impacts on soil redox condition and microbial metabolism (Huang et al, 2020; Keiluweit et al, 2016; Li et al, 2021). However, evidence for these patterns is largely limited to soils from paddy fields, tropical rainforests, and wetlands (Fenner & Freeman, 2011; Hall & Silver, 2013; Li et al, 2021; Wang et al, 2017). Increased oxygen availability can improve the activities of phenol oxidases, breaking the toxic phenolic “latch” of hydrolases and further stimulating the release of stored C to water in a biogeochemical cascade (Fenner & Freeman, 2020; Freeman et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Oxygen availability regulates the quality of soil dissolved organic matter by mediating microbial metabolism and iron oxidation

Chen

et al. 2022

Global Change Biology

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Dissolved organic matter (DOM) plays a vital role in biogeochemical processes and in determining the responses of soil organic matter (SOM) to global change. Although the quantity of soil DOM has been inventoried across diverse spatio-temporal scales, the underlying mechanisms accounting for variability in DOM dynamics remain unclear especially in upland ecosystems. Here, a gradient of SOM storage across 12 croplands in northeast China was used to understand links between DOM dynamics, microbial metabolism, and abiotic conditions. We assessed the composition, biodegradability, and key biodegradable components of DOM. In addition, SOM and mineral-associated organic matter (MAOM) composition, soil enzyme activities, oxygen availability, soil texture, and iron (Fe), Fe-bound organic matter, and nutrient concentrations were quantified to clarify the drivers of DOM quality (composition and biodegradability). The proportion of biodegradable DOM increased exponentially with decreasing initial DOM concentration due to larger fractions of depolymerized DOM that was rich in small-molecular phenols and proteinaceous components.Unexpectedly, the composition of DOM was decoupled from that of SOM or MAOM, but significantly related to enzymatic properties. These results indicate that microbial metabolism exhibited a dominant role in DOM generation. As DOM concentration declined, increased soil oxygen availability regulated DOM composition and enhanced its biodegradability mainly through mediating microbial metabolism and Fe oxidation.The oxygen-induced oxidation of Fe(II) to Fe(III) removed complex DOM compounds with large molecular weight. Moreover, increased oxygen availability stimulated oxidase-catalyzed depolymerization of aromatic substances, and promoted production of protein-like DOM components due to lower enzymatic C/N acquisition ratio.As global changes in temperature and moisture will have large impacts on soil oxygen availability, the role of oxygen in regulating DOM dynamics highlights the importance of integrating soil oxygen supply with microbial metabolism and Fe redox status to improve model predictions of soil carbon under climate change.

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Section: Introductionmentioning

confidence: 99%

Oxygen availability regulates the quality of soil dissolved organic matter by mediating microbial metabolism and iron oxidation

Chen

et al. 2022

Global Change Biology

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“…The D p / D o is not only dependent on the soil pore structure, but also affected by the air‐filled porosity (Chamindu Deepagoda et al, 2015, 2012; Masís‐Meléndez et al, 2014; Moldrup et al, 2013). Generally, the D p / D o is associated with the soil's physical and biochemical functions, such as oxygen availability and greenhouse gas emissions (Li, Shahbaz, et al, 2021), leading to the overall ecosystem health of the Loess Plateau. The significant drop in D p / D o observed at higher WBSM application rates is attributable to the increased tortuosity in the functional gaseous phase in WBSM‐induced fine‐textured soils.…”

Section: Discussionmentioning

confidence: 99%

Water‐based spent drilling mud regulates hydrophysical properties of coarse‐textured loessial soil

Liu

Fan

et al. 2022

European J Soil Science

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Amendment application is one of the effective measures used to remediate structural problems in coarse‐textured soils. However, the application of water‐based spent drilling mud (WBSM) as a potential amendment and its associated impacts on physical and hydraulic soil properties is not well‐studied. This research aimed to investigate the effect of the application of WBSM on basic hydrophysical properties of coarse‐textured loessial soil sampled from the Loess Plateau, China. Application of WBSM to repacked loessial soil at four application rates (0, 25.0, 50.0, 75.0 g kg−1, dry basis), denoted as control (H0), low (HDL), medium (HDM) and high (HDH), respectively, was used to investigate changes in soil bulk density (ρb), soil total porosity (ƒ), saturated hydraulic conductivity (Ks), relative gas diffusivity (Dp/Do), soil‐water retention and soil evaporation characteristics. The results showed that the soil ρb in HDL and HDM decreased by 4.0% and 5.5%, respectively, as compared to H0 (p < 0.05). Measured Ks changed to 36.7% (HWL), 12.2% (HWM) and 4.4% (HWH) as compared to H0 (5.56 cm d−1). The application of WBSM further decreased the percentage of soil pore sizes >30 μm, but increased the proportion of medium pore sizes (≥30–50 μm), micro pore sizes (≥0.3–5 μm) and extremely micro pore sizes (<0.3 μm), which was attributed to the clogging effect of the fine and clay particles contained in WBSM. Decline in Dp/Do, however, was observed with increasing WBSM, likely due to the increased pore tortuosity in fine‐grained soil. The van Genuchten soil‐water retention model parameters differed largely across the WBSM application rates, with increased soil available water‐holding capacity by 50.9%, 65.9% and 64.1% in HDL, HDM and HWH, respectively, as compared to H0. However, WBSM application also increased soil available water‐holding capacity and reduced evaporative water loss, which has useful implications for the management of coarse‐textured soils with a distinct water deficit in fragile ecosystems. Widespread use of WBSM to amend coarse‐textured soils requires further studies to evaluate the effects of WBSM amendments in field trials and its environmental consequences. Highlights Water‐based spent drilling mud (WBSM) altered the texture of loessial soil. WBSM increased soil total porosity and changed pore size distribution. WBSM affected the characteristics of soil water and gas transport. The soil water availability was improved by WBSM application.

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“…The effects of oxygen availability on SOC stock should also be taken into account as oxygen availability affects microbial activity and ultimately impacts SOC decomposition. Li et al (2021) found that oxygen availability regulated key determinants of SOC mineralization rate in paddy soils. Undoubtedly, the flooded soil status and the anaerobic soil environment caused by tidal oscillations (in TSW and TPW) and freshwater flooding (in FPW), flooding duration and soil salinity all contribute to the slow decomposition of SOM, and finally result in the accumulation of SOM over time (Chanlabut et al, 2020).…”

Section: -5cm 10-15cmmentioning

confidence: 99%

Soil organic carbon stabilization and associated mineral protection in typical coastal wetlands under different hydrologic conditions

Zhao¹,

Jia²,

Zhao³

et al. 2022

Front. Mar. Sci.

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The soil carbon sequestration largely depends on soil organic carbon (SOC) stability. However, the mechanism of SOC stabilization in coastal wetlands under different hydrologic conditions remains to be clarified. In this study, the effect of mineral protection on SOC stabilization was investigated in freshwater-flooded Phragmites australis wetlands (FPW), tidal P. australis wetlands (TPW), non-flooded P. australis wetlands (NPW) and tidal Suaeda salsa wetlands (TSW). Two stabilized SOC fractions (Na2S2O8 resistant SOC and H2O2 resistant SOC) and Al/Fe/Si oxides extracted by acid oxalate, dithionite–citrate and pyrophosphate, respectively, were determined in soil samples collected to a depth of 25 cm. The contents of soil Na2S2O8 resistant SOC and H2O2 resistant SOC were not significantly different among the four wetlands (p > 0.05), with the highest mean values occurring in FPW (1.44 ± 0.43 g kg-1) and TPW (1.79 ± 0.40 g kg-1), respectively. The contents of Al/Fe/Si oxides (except for Sip) and the values of mineral phase indicators were significantly lower in NPW than in TPW or FPW (p < 0.05). Linear regressions among Al/Fe/Si oxides, mineral phase indicators, and two stabilized SOC fractions showed that Na2S2O8 resistant SOC and H2O2 resistant SOC were positively and significantly affected by mineral contents (p < 0.05). Additionally, edaphic factors such as soil organic matter, total nitrogen, soil water content, clay and silt contents were identified as important factors influencing the two stabilized SOC fractions.

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Oxygen availability determines key regulators in soil organic carbon mineralisation in paddy soils

Cited by 52 publications

References 81 publications

Oxygen availability regulates the quality of soil dissolved organic matter by mediating microbial metabolism and iron oxidation

Oxygen availability regulates the quality of soil dissolved organic matter by mediating microbial metabolism and iron oxidation

Water‐based spent drilling mud regulates hydrophysical properties of coarse‐textured loessial soil

Soil organic carbon stabilization and associated mineral protection in typical coastal wetlands under different hydrologic conditions

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