Rhizosphere effect and its associated soil-microbe interactions drive iron fraction dynamics in tidal wetland soils

Xiao, Shuyao; Luo, Min; Liu, Yuxiu; Bai, Jing; Yang, Yang; Zhai, Zhifeng; Huang, Jiafang

doi:10.1016/j.scitotenv.2020.144056

Cited by 24 publications

(8 citation statements)

References 65 publications

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“…The mean concentrations of Pb and Zn in Phragmites australis were 18.98 mg 62.46 mg/kg, respectively, which were higher than those of other vegetation type was little difference between different vegetation types in the concentration o higher concentration of Fe occurred in Phragmites australis (mean concentration 2.5 paddy field (mean concentration 2.67%), whose roots could promote Fe adsorptio soil [34,35]. The highest concentration of Cr occurred in Tamarix chinensis-Suae with a mean value of 70.19 mg/kg.…”

Section: Metal Concentrations Under Different Vegetation Typesmentioning

confidence: 86%

Distribution and Influencing Factors of Metals in Surface Soil from the Yellow River Delta, China

Ling

et al. 2022

Land

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To study metal enrichment and identify the influencing factors, 106 surface soils were collected in the Yellow River delta, including ten vegetation types. Concentrations of 10 different metals, including As, Cd, Cr, Ni, Cu, Pb, Zn, Mn, Al, Fe, and physicochemical properties pH, salinity, particle size were detected. The pH value was 7.35~9.17, and the salinity was in the range of 0.01~2.00%. The average value of silt was 76.18%, which was the main particle size for 99% of the samples. The mean concentrations of As, Cd, Cr, and Ni were higher than the background value of Shandong Province or the background value of yellow soil in China. A higher concentration of Fe occurred in Phragmites australis (mean concentration 2.50%) and paddy field. The concentrations of Cd, Cr, Ni, Cu, Pb and Zn were lower in the Suaeda salsa soil. The Nemerow pollution index indicated that 79% of all samples showed low-level metal pollution, and 7% of all samples showed moderate-level metal pollution. In the areas with higher salinity, the concentrations of As were higher, while the concentrations of Cd and Ni were lower. The correlation analysis showed that with increasing pH, the concentrations of As and Zn decreased significantly. The metal concentrations had a significant positive correlation with clay, except for As.

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Section: Metal Concentrations Under Different Vegetation Typesmentioning

confidence: 86%

Distribution and Influencing Factors of Metals in Surface Soil from the Yellow River Delta, China

Ling

et al. 2022

Land

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“…Under the influence of plant roots, functional microorganisms are particularly active in the rhizosphere, and their vigorous life activities need the supply of soil fertility. The available carbon and nitrogen contents of bulk soil under mulching measures are rich, which is transmitted to the rhizosphere soil under the action of the rhizosphere effect (Oberholster et al, 2018; Ruan et al, 2019; Xiao et al, 2021) to regulate the abundance of diazotrophs. In addition, mulching measures improved the community structure of diazotrophs in rhizosphere soil.…”

Section: Discussionmentioning

confidence: 99%

Dynamic variability of soil diazotrophs in bulk‐rhizosphere and phenological stages under long‐term mulching in an eroded area in the Loess Plateau

Hao

Liu

et al. 2021

Land Degrad Dev

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Free‐living diazotrophs play a significant role in the process of soil biological nitrogen fixation. Long‐term field management has a cumulative effect on soil microbial communities. However, after long‐term mulching measures in erosion areas, the stability difference in diazotrophs in bulk‐rhizosphere soil and the temporal dynamic changes remain unclear. In this study, we analysed the dynamic variability of soil diazotrophic community structures using high‐throughput sequencing. The result of Chao1 diversity index showed that mulching effectively increased the richness of soil diazotrophs. Combining the community composition, it was found that the diversity level of the soil diazotrophic community under mulching decreased more drastically along the development stages compared with no‐tillage, and Bradyrhizobium played a major role in nitrogen fixation. In rhizosphere soil, mulching promoted the relative abundances of Azohydromonas, Bradyrhizobium, and Skermanella. Co‐occurrence network analysis indicated that mulching measures strengthened the connection between the dominant components to improve the aggregation of the network. The partial least squares‐path model showed that the richness of diazotrophs in rhizosphere soil had an indirect effect on mulching through the available carbon and nitrogen nutrients of bulk soil, thereby improving the response rate to environmental variables. Overall, our findings showed that under long‐term mulching, the richness and aggregation of dominant components of the soil diazotrophic community increased with the phenological period and distance from roots, revealing the importance of mulching in eroded areas to improve farmland soil nitrogen fixation capacity. This study provides a theoretical reference for microecology to effectively improve soil fertility in similar areas.

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“…The DNA extracted from sediment, water, and Fe lms was used for high-throughput sequencing. In addition, the microbial community around the rhizosphere was analyzed after enrichment since rhizosphere microorganisms are closely related to the Fe(II) oxidation process (Weiss et al 2005;Xiao et al 2021). The dominant bacterial phyla were detected across all samples associated with the Fe lms (Fig.…”

Section: Bacterial Community Composition Of Oating Lms and Lmassociat...mentioning

confidence: 99%

“…In wetlands, two main forms of Fe precipitates (Fe plaque and oating Fe lms) are associated with Fe cycling. However, most research has focused on the rhizosphere environment, including the formation of Fe plaques and their effect on ecosystems (Weiss et al 2003;Xiao et al 2021;Yu et al 2021). Floating Fe lms are often mistaken for oil and bio lms due to their oily and silvery appearance.…”

Section: Introductionmentioning

confidence: 99%

Natural Floating Fe Films: Microbial Interactions and Function within Fe Cycling Bacteria in Wetlands

Tong¹,

Dong

Chen³

et al. 2022

SSRN Journal

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Rhizosphere effect and its associated soil-microbe interactions drive iron fraction dynamics in tidal wetland soils

Cited by 24 publications

References 65 publications

Distribution and Influencing Factors of Metals in Surface Soil from the Yellow River Delta, China

Distribution and Influencing Factors of Metals in Surface Soil from the Yellow River Delta, China

Dynamic variability of soil diazotrophs in bulk‐rhizosphere and phenological stages under long‐term mulching in an eroded area in the Loess Plateau

Natural Floating Fe Films: Microbial Interactions and Function within Fe Cycling Bacteria in Wetlands

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