Microorganism-induced weathering of clay minerals in a hydromorphic soil

Hong, Hanlie; Fang, Qian; Cheng, Liuling; Wang, Chaowen; Churchman, G. Jock

doi:10.1016/j.gca.2016.04.015

Cited by 37 publications

(13 citation statements)

References 44 publications

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“…64 The associations between NO 3 − -N concentration and silt and sand were relatively weak (R 2 < 0.1, Figures 5 and S2), suggesting that they may not be the dominant influencing factors affecting NO 3 − -N accumulation. Given the wide distribution of red soils in tropical and subtropical regions around the world and the depth of their regolith, 38,46 they may contain vast amounts of previously unaccounted N. In China alone, they cover over 2 × 10 6 km 2 . With increasing land-use intensity of red soils in China, they likely represent a large pool of NO 3 − -N. Our results show that the capacity to store NO 3 − -N is largely subject to regolith thickness.…”

Section: ■ Discussionmentioning

confidence: 99%

Deep Nitrate Accumulation in a Highly Weathered Subtropical Critical Zone Depends on the Regolith Structure and Planting Year

Yang

Dong

et al. 2020

Environ. Sci. Technol.

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Nitrate accumulated deep (>100 cm) in the regolith (soil and saprolite) threatens groundwater quality, but most studies focus only on nitrate nearer the surface (<100 cm). Surface soil management versus regolith interactions affect deep nitrate leaching, but their combined impact remains unclear. This study measured how deep nitrate accumulation was affected by crop practices including orchard/cropland planting years, regolith structure, and soil properties in highly weathered subtropical red soils. Deep nitrate storage varied from 43.6 to 1116.3 kg ha–1. Regolith thickness was positively correlated with nitrate storage (R 2 = 0.43, p < 0.05). Reticulated red clay (110–838 cm) had 81% of the accumulated nitrate and overlapped with 79% of the nitrate accumulation layer. All of the nitrate accumulation parameters (except for peak depth (PD)) generally increased with the planting years. The difference in peak nitrate concentration (9.0–20.0 mg kg–1) with planting year gradient (3–58 years) varied by 2.2 times, and the difference in nitrate storage (43.6–425.7 kg ha–1) varied by 9.8 times. Texture and pH explain 41.6% of the variation in nitrate concentration. As soil management practices interact with deeper regolith to control the spatial pattern of nitrate accumulation, vulnerable regions could be identified to avoid high accumulation.

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Section: ■ Discussionmentioning

confidence: 99%

Deep Nitrate Accumulation in a Highly Weathered Subtropical Critical Zone Depends on the Regolith Structure and Planting Year

Yang

Dong

et al. 2020

Environ. Sci. Technol.

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“…In general, bacteria increase the rate of mineral dissolution through proton-and ligand-promoted dissolution mechanisms [1,31]. The quantities of organic acids produced by bacteria play an important role in mineral weathering [5,31,[33][34][35]. Strain F74 produced a larger decrease in the pH (pH < 4.0) and more gluconic acid production in the presence of biotite (Figure 3), suggesting that the increase in dissolved Al and Fe in the culture medium may have been caused by proton-and ligand-promoted dissolution mechanisms in the presence of the strain [31].…”

Section: Discussionmentioning

confidence: 99%

Distinct biotite‐weathering activities of Arthrobacter pascens F74 under different contact conditions

Sun

Wang

et al. 2019

J Basic Microbiol

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Bacteria play important roles in mineral weathering and soil formation. However, little is known regarding the interactions between biotite and Arthrobacter strains. In this study, the mineral–mineral activities of the Arthrobacter pascens F74 isolated from a weathered rock surface were evaluated for its weathering behavior under direct contact and no contact with biotite. No contact was obtained by using dialysis bags. When directly in contact with biotite, Al and Fe concentrations increased by 9‐ to 47‐fold compared with the controls in the presence of strain F74. Furthermore, strain F74 increased mobilized Al by 106% to 175% and Fe by 29% to 123% under direct contact than under no contact conditions. During biotite dissolution, significantly higher cell numbers and lower pH in the culture medium were observed in the presence of strain F74 under direct contact conditions than under no contact conditions. Significantly higher gluconic acid concentration and glucose dehydrogenase activity were found under direct contact conditions than under no contact and no biotite conditions. Scanning electron microscopy analysis showed cell adhesion on the biotite surface. These results demonstrated that strain F74 behaved differently with respect to biotite‐weathering effectiveness and mechanisms under different contact conditions. The results also suggested that direct contact between biotite and strain F74 was important for the production of gluconic acid, cell adhesion on the mineral surface, and the mineral dissolution of the strain.

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“…Therefore, the microstructure of soft clay was not sensitive to the change of illite density. Montmorillonite has the chemical formula O16H8Si8Al4 and its density varies from 2.60 to 2.90 [27,31]. The density of the total mineral components after the montmorillonite density change was calculated, as shown in Table 3.…”

Section: The Effect Of the Density Of Clay Minerals On The Percentagementioning

confidence: 99%

Quantitative Analysis of 3D Reconstruction Parameters of Multi-Materialsin Soft Clay

Liu

Song

Yang

et al. 2018

JMSE

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The results of the three-dimensional reconstruction of soil were derived from the X-ray absorption coefficient of the material itself. However, the absorption coefficient is not a fixed value, and is related to densities, chemical molecular weight, and the weight percentages of chemical components. How to accurately obtain the density of one component is a vital issue in multi-materials. In this study, the influence of the physical parameters of each component in the data-constrained modeling (DCM) of the microstructure of soft clay was investigated. The results showed that density changes were more prominent. A reasonable multi-component density was calculated, and the density of organic matter had a significant effect on the volume percentage of three-dimensional soft clay. In the clay mineral montmorillonite, the density significantly affected the volume percentage data, which directly limited the accuracy of the material distribution analysis. Based on this, other physical parameters of each component in the data constraint model could be further explored. Based on the density value of the simple material, a reasonable multi-materials density was calculated, which provides a quantitative method for the evolution analysis of soil structure.

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Microorganism-induced weathering of clay minerals in a hydromorphic soil

Cited by 37 publications

References 44 publications

Deep Nitrate Accumulation in a Highly Weathered Subtropical Critical Zone Depends on the Regolith Structure and Planting Year

Deep Nitrate Accumulation in a Highly Weathered Subtropical Critical Zone Depends on the Regolith Structure and Planting Year

Distinct biotite‐weathering activities of Arthrobacter pascens F74 under different contact conditions

Quantitative Analysis of 3D Reconstruction Parameters of Multi-Materialsin Soft Clay

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