NH4+-N/NO3−-N ratio controlling nitrogen transformation accompanied with NO2−-N accumulation in the oxic-anoxic transition zone

Liu, Xiaoyan; Wu, Yaoguo; Sun, Ran; Hu, Shixue; Qiao, Zixia; Wang, Sichang; Mi, Xiaohui

doi:10.1016/j.envres.2020.109962

Cited by 40 publications

(7 citation statements)

References 56 publications

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“…As for the HAV rhizosphere, it has unique classes of bacteria with varied special functions. Especially, it tended to recruit the nitrite reduction microorganisms for keeping the soil NH 4 + –N utilization and plant NH 4 + –N uptake . Furthermore, the higher levels of low-molecular-weight organic acids (mainly maleic acid) in the HAV rhizosphere could enhance CIP bioavailability, leading to adverse impact on the growth and colonization of NOB and less production and utilization of NO 3 – –N. , Overall, the variety-specific bacterial communities greatly affect the rhizosphere utilization of N forms.…”

Section: Discussionmentioning

confidence: 99%

Mechanism and Association between Microbial Nitrogen Transformation in Rhizosphere and Accumulation of Ciprofloxacin in Choysum (Brassica parachinensis)

Yan,

Xiang,

Zhang

et al. 2023

Environ. Sci. Technol.

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Rhizosphere microbiota are an important factor impacting plant uptake of pollutants. However, little is known about how microbial nitrogen (N) transformation in the rhizosphere affects the uptake and accumulation of antibiotics in plants. Here, we determined recruitment of N transformation functional bacteria upon ciprofloxacin (CIP) exposure, by comparing differences in assembly processes of both rhizospheric bacterial communities and N transformation between two choysum (Brassica parachinensis) varieties differing in CIP accumulation. The low accumulation variety (LAV) of CIP recruited more host bacteria (e.g., Nitrospiria and Nitrolancea) carrying nitrification genes (mainly nxrA) but fewer host bacteria carrying denitrification genes, especially narG, relative to the high accumulation variety (HAV) of CIP. The nxrA and narG abundance in the LAV rhizosphere were, respectively, 1.6−7.8 fold higher and 1.4−3.4 fold lower than those in the HAV rhizosphere. Considering that nitrate can decrease CIP uptake into choysum through competing for the proton motive force and energy, such specific bacteria recruitment in LAV favored the production and utilization of nitrate in its rhizosphere, thus limiting its CIP accumulation with 1.6−2.4 fold lower than the HAV. The findings give insight into the mechanism underlying low pollutant accumulation, filling the knowledge gap regarding the profound effects of rhizosphere microflora and N transformation processes on antibiotic accumulation in crops.

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Section: Discussionmentioning

confidence: 99%

Mechanism and Association between Microbial Nitrogen Transformation in Rhizosphere and Accumulation of Ciprofloxacin in Choysum (Brassica parachinensis)

Yan,

Xiang,

Zhang

et al. 2023

Environ. Sci. Technol.

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“…Due to the low level of oxygen or depletion in paddy soils, the rate of ammonification is slower compared with upland soils [ 108 ]. The depletion of O 2 in soils not only slows down the ammonification but also limits the process of ammonium oxidation (NH 4 + to NO 3 − ) and the immobilization of N (microbial assimilation of NH 4 + , i.e., the conversion of inorganic N to organic N), which leads to the accumulation of NH 4 + in soils [ 109 ].…”

Section: Hms and Soil N Transformationmentioning

confidence: 99%

The Effects of Heavy Metal Pollution on Soil Nitrogen Transformation and Rice Volatile Organic Compounds under Different Water Management Practices

Afzal,

Muhammad,

Tan

et al. 2024

Plants

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One of the most concerning global environmental issues is the pollution of agricultural soils by heavy metals (HMs), especially cadmium, which not only affects human health through Cd-containing foods but also impacts the quality of rice. The soil’s nitrification and denitrification processes, coupled with the release of volatile organic compounds by plants, raise substantial concerns. In this review, we summarize the recent literature related to the deleterious effects of Cd on both soil processes related to the N cycle and rice quality, particularly aroma, in different water management practices. Under both continuous flooding (CF) and alternate wetting and drying (AWD) conditions, cadmium has been observed to reduce both the nitrification and denitrification processes. The adverse effects are more pronounced in alternate wetting and drying (AWD) as compared to continuous flooding (CF). Similarly, the alteration in rice aroma is more significant in AWD than in CF. The precise modulation of volatile organic compounds (VOCs) by Cd remains unclear based on the available literature. Nevertheless, HM accumulation is higher in AWD conditions compared to CF, leading to a detrimental impact on volatile organic compounds (VOCs). The literature concludes that AWD practices should be avoided in Cd-contaminated fields to decrease accumulation and maintain the quality of the rice. In the future, rhizospheric engineering and plant biotechnology can be used to decrease the transport of HMs from the soil to the plant’s edible parts.

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“…The content of NH4 + -N in each treatment was analyzed by the phenol hypochlorite method. The content of NO 3− -N was analyzed using the UV spectroscopy method (Liu et al, 2020), and the sum of NH4 + -N and NO 3− -N content was taken as the content of available N. Ammonium acetate (1 mol L −1 NH 4 OAc pH 7.0) was used to extract available K, which was measured using a flame photometer (SherwoodM410). Available manganese (Mn), copper (Cu), and zinc (Zn) in the soil were determined by inductively coupled plasma-mass spectrometry.…”

Section: Data Collectionmentioning

confidence: 99%

Spatiotemporal prediction and optimization of environmental suitability in citrus-producing areas

Zou²,

Yang³

et al. 2022

Front. Environ. Sci.

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The increasing need for citrus has driven the rapid expansion of citrus planting areas. However, not all areas are suitable for growing citrus. It is necessary to understand the future changing trend of environmental suitability in citrus-producing areas. Here, based on the soil nutrient data of citrus cultivation from 2006 to 2018, the spatiotemporal kriging method was used to predict the spatiotemporal distribution of soil nutrients in Zigui County, Hubei Province. Then, geographical and meteorological conditions were combined to evaluate the suitability for citrus cultivation at temporal and spatial levels, and the results were verified by the yield and quality data of citrus. The results showed that from 2018 to 2027, the overall suitability of the citrus-producing area displayed a gradually rising trend, with the “suitable” producing area increasing from 4.5% to 20.16%. The validation results indicated that the mean relative errors of spatiotemporal predictors were less than 30% except for the effective iron. Correlation analysis revealed that the proportion of “moderately suitable” and “suitable” orchards had significant positive correlations with annual yield. The low suitability of Maoping town was mainly attributed to its soil acidification and available P content, and that of Shazhenxi town was ascribed to its low soil contents of available P and N. The optimal fertilization scheme was constructed by an artificial neural network to optimize the fertilization status of some citrus producing areas. This study has created a dynamic assessment of the environmental suitability of citrus production areas to support improvements in citrus production.

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NH4+-N/NO3−-N ratio controlling nitrogen transformation accompanied with NO2−-N accumulation in the oxic-anoxic transition zone

Cited by 40 publications

References 56 publications

Mechanism and Association between Microbial Nitrogen Transformation in Rhizosphere and Accumulation of Ciprofloxacin in Choysum (Brassica parachinensis)

Mechanism and Association between Microbial Nitrogen Transformation in Rhizosphere and Accumulation of Ciprofloxacin in Choysum (Brassica parachinensis)

The Effects of Heavy Metal Pollution on Soil Nitrogen Transformation and Rice Volatile Organic Compounds under Different Water Management Practices

Spatiotemporal prediction and optimization of environmental suitability in citrus-producing areas

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