Effects of Fe(II) and organic carbon on nitrate reduction in surficial sediments of a large shallow freshwater lake

Li, Na; Li, Yong; Lou, Ruitao; Xu, Hong; Saeed, Laraib

doi:10.1016/j.jenvman.2023.117623

Cited by 3 publications

(3 citation statements)

References 40 publications

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“…Fe(II) addition slowed down the microbial nitrate reduction under anoxic conditions (Figure A), which may be due to competition between nitrate and Fe(III) secondary minerals as coexisting electron acceptors , and the inhibition on metabolic capability caused by cell encrustation. , The concentrations of dissolved Fe(II) did not increase during the time course of the incubation (Figure A), suggesting that Fe(III) reduction rarely takes place during nitrate reduction. This can be supported by the finding that Fe(III) reduction only happens once nitrate is completely reduced in paddy soils and freshwater lake sediments. , The severe encrustation observed in the cells of soil + Fe(II) + NO 3 – treatment (Figure F,G) likely leads to inactivation of the proteins for nitrate reduction in the periplasm and cytoplasm. The presence of Fe(II) increased the relative abundance of the napAB gene but decreased that of the narG gene (Figure ), suggesting that nitrate reduction mainly takes place in the periplasm via NapAB during Fe(II) oxidation.…”

Section: Discussionmentioning

confidence: 61%

“…This can be supported by the finding that Fe(III) reduction only happens once nitrate is completely reduced in paddy soils and freshwater lake sediments. 26,73 The severe encrustation observed in the cells of soil + Fe(II) + NO 3 − treatment (Figure 1F,G) likely leads to inactivation of the proteins for nitrate reduction in the periplasm and cytoplasm. The presence of Fe(II) increased the relative abundance of the napAB gene but decreased that of the narG gene (Figure 4), suggesting that nitrate reduction mainly takes place in the periplasm via NapAB during Fe(II) oxidation.…”

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confidence: 99%

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Fe(II) Oxidation Shaped Functional Genes and Bacteria Involved in Denitrification and Dissimilatory Nitrate Reduction to Ammonium from Different Paddy Soils

Pan,

Chen,

Yang

et al. 2023

Environ. Sci. Technol.

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Section: Discussionmentioning

confidence: 61%

mentioning

confidence: 99%

Fe(II) Oxidation Shaped Functional Genes and Bacteria Involved in Denitrification and Dissimilatory Nitrate Reduction to Ammonium from Different Paddy Soils

Pan,

Chen,

Yang

et al. 2023

Environ. Sci. Technol.

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“…The samples were air-dried in a laboratory and then gently crushed to pass through a 20-mesh nylon sieve. The SOC content was measured by using the combustion oxidation-titration method according to Chinese National Environmental Protection Standards (HJ 658-2013) [45].…”

Section: Soc Content Of Sampling Pointsmentioning

confidence: 99%

Mapping Soil Organic Carbon in Floodplain Farmland: Implications of Effective Range of Environmental Variables

Chen

Zhu

et al. 2023

Land

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Accurately mapping soil organic carbon (SOC) is conducive to evaluating carbon storage and soil quality. However, the high spatial heterogeneity of SOC caused by river-related factors and agricultural management brings challenges to digital soil mapping in floodplain farmland. Moreover, current studies focus on the non-linear relationship between SOC and covariates, but ignore the effective range of environmental variables on SOC, which prevents the revelation of the SOC differentiation mechanism. Using the 375 samples collected from the Jiangchang Town near Han River, we aim to determine the main controlling factors of SOC, reveal the effective range of environmental variables, and obtain the spatial map of SOC by using the gradient boosting decision tree (GBDT) model and partial dependence plots. Linear regression was used as a reference. Results showed that GBDT outperformed linear regression. GBDT results show that the distance from the river was the most important SOC factor, confirming the importance of the Han River to the SOC pattern. The partial dependence plots indicate that all environmental variables have their effective ranges, and when their values are extremely high or low, they do not respond to changes in SOC. Specifically, the influential ranges of rivers, irrigation canals, and rural settlements on SOC were within 4000, 200, and 50 m, respectively. The peak SOC was obtained with high clay (≥31%), total nitrogen (≥1.18 g/kg), and total potassium contents (≥11.1 g/kg), but it remained steady when these covariates further increased. These results highlight the importance of revealing the effective range of environmental variables, which provides data support for understanding the spatial pattern of SOC in floodplain farmland, achieving carbon sequestration in farmland and precision agriculture. The GBDT with the partial dependence plot was effective in SOC fitting and mapping.

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Biogeochemical cycles of iron: Processes, mechanisms, and environmental implications

Liu,

Chen

et al. 2024

Science of The Total Environment

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Effects of Fe(II) and organic carbon on nitrate reduction in surficial sediments of a large shallow freshwater lake

Cited by 3 publications

References 40 publications

Fe(II) Oxidation Shaped Functional Genes and Bacteria Involved in Denitrification and Dissimilatory Nitrate Reduction to Ammonium from Different Paddy Soils

Fe(II) Oxidation Shaped Functional Genes and Bacteria Involved in Denitrification and Dissimilatory Nitrate Reduction to Ammonium from Different Paddy Soils

Mapping Soil Organic Carbon in Floodplain Farmland: Implications of Effective Range of Environmental Variables

Biogeochemical cycles of iron: Processes, mechanisms, and environmental implications

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