Selective successional transport of bacterial populations from rooted agricultural topsoil to deeper layers upon extreme precipitation events

Zhang, Lu; Lehmann, Katharina; Totsche, Kai Uwe; Lueders, Tillmann

doi:10.1016/j.soilbio.2018.06.012

Cited by 18 publications

(13 citation statements)

References 55 publications

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“…Patescibacteria at our study site, as these organisms were mobilized in high abundance in seepage, despite their low relative abundance in the soil microbial communities. Likewise, Zhang et al (2018) recently observed high abundance of Cand . Patescibacteria in seepage collected beneath maize-planted agricultural soils, indicating preferential mobilization as a common trait for these organisms.…”

Section: Discussionmentioning

confidence: 85%

“…Since the strata of the lower aquifer assemblage (HTL) crop out at upper hill areas that are thought to function as preferential surface-recharge areas (Kohlhepp et al, 2017), we followed changes in the groundwater microbiome along the subsurface water flow from its origin through shallow perched groundwater to deeper saturated zones. Seepage-dependent release and transport - including colloid-assisted transport - are passive dispersal mechanisms (Dibbern et al, 2014; Lehmann et al, 2018; Zhang et al, 2018) that link soil, subsoil and groundwater microbiomes, allowing organisms to colonize the groundwater and spread along the multi-story aquifer system of the Hainich CZE. This repetitive flow of water and transport of cells and matter creates a constant disturbance characteristic for shallow groundwater ecosystems, influencing community assembly.…”

Section: Discussionmentioning

confidence: 99%

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Predominance of Cand. Patescibacteria in Groundwater Is Caused by Their Preferential Mobilization From Soils and Flourishing Under Oligotrophic Conditions

et al. 2019

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Despite the widely observed predominance of Cand . Patescibacteria in subsurface communities, their input source and ecophysiology are poorly understood. Here we study mechanisms of the formation of a groundwater microbiome and the subsequent differentiation of Cand . Patescibacteria. In the Hainich Critical Zone Exploratory, Germany, we trace the input of microorganisms from forested soils of preferential recharge areas through fractured aquifers along a 5.4 km hillslope well transect. Cand . Patescibacteria were preferentially mobilized from soils and constituted 66% of species-level OTUs shared between seepage and shallow groundwater. These OTUs, mostly related to Cand . Kaiserbacteraceae, Cand . Nomurabacteraceae, and unclassified UBA9983 at the family level, represented a relative abundance of 71.4% of the Cand . Patescibacteria community at the shallowest groundwater well, and still 44.4% at the end of the transect. Several Cand . Patescibacteria subclass-level groups exhibited preferences for different conditions in the two aquifer assemblages investigated: Cand . Kaiserbacteraceae surprisingly showed positive correlations with oxygen concentrations, while Cand . Nomurabacteraceae were negatively correlated. Co-occurrence network analysis revealed a central role of Cand . Patescibacteria in the groundwater microbial communities and pointed to potential associations with specific organisms, including abundant autotrophic taxa involved in nitrogen, sulfur and iron cycling. Strong associations among Cand . Patescibacteria themselves further suggested that for many groups within this phylum, distribution was mainly driven by conditions commonly supporting a fermentative life style without direct dependence on specific hosts. We propose that import from soil, and community differentiation driven by hydrochemical conditions, including the availability of organic resources and potential hosts, determine the success of Cand . Patescibacteria in groundwater environments.

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Section: Discussionmentioning

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Predominance of Cand. Patescibacteria in Groundwater Is Caused by Their Preferential Mobilization From Soils and Flourishing Under Oligotrophic Conditions

et al. 2019

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“…Hence, it is proposed that various factors such as import from the soil and community differentiation driven by rhizosphere niche conditions, including the availability of organic resources and potential hosts, symbiotic or mutualistic interaction with other rhizosphere bacterial communities, could have greatly determined the abundance of Candidatus Patescibacteria in arecanut rhizosphere. Similarly, Zhang et al (2018) observed a high abundance of Candidatus Patescibacteria in seepage collected beneath maize-planted agricultural soils.…”

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confidence: 77%

Metagenomic analysis reveals the predominance of Candidatus Patescibacteria in the rhizosphere of arecanut palms in yellow leaf disesase (YLD) endemic areas of India

Paulraj

Bhat²,

Rajesh³

et al. 2022

JPC

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“…The tension-supported Type III lysimeter was specifically constructed to representatively and quantitatively sample the seepage with dissolved, colloidal and particulate mobile components in undisturbed soils (similar Set-up: (Zhang et al, 2018). We used commercially available lysimeters that were filled with glass beads (all from UMS GmbH, München, Germany), circular in geometry and made of stainless steel (d 0.3 m; h 0.14 m).…”

Section: Type III Lysimetermentioning

confidence: 99%

Soil Solution Analysis With Untargeted GC–MS—A Case Study With Different Lysimeter Types

et al. 2021

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Surface-sourced organic compounds in infiltrating waters and percolates are transformed during their belowground passage. Biotic and abiotic processes thereby lead to continuously changing chemical environments in subsurface compartments. The investigation of such transformations of organic compounds aims for tracing subsurface fluxes as well as biotic and abiotic activity. To collect samples of soil solution, different kinds of lysimeters are available, spanning simple free-draining devices that sample water based on gravimetric flow and tension lysimeters allowing for approximating natural hydraulic conditions. Protocols for untargeted analytical profiling of organic soil solution constituents are scarce. We report here a solid phase extraction followed by GC–MS analysis, utilizing two long-term sampling devices in the Hainich Critical Zone Exploratory in Thuringia, Germany. In addition, we introduce a new lysimeter constructed exclusively from inert materials that allows for obtaining samples with little background signals in GC–MS. Polyvinylchloride (PVC)-based lysimeters introduce substantial background signals from plasticizers. We show how signals from these contaminants can be lowered during data analysis using chemometric background removal. Applying multivariate statistics for data analysis, we demonstrate the ability for monitoring of several sugars, fatty acids and phenolic acids at the topsoil-subsoil boundary and even beyond, via an untargeted analytical approach. Statistical tools facilitated the detection of differences in chemical signatures at three different land use sites. Data mining methods for metabolomics led to the identification of 3-carboxyphenylalanin as marker for a pasture site. The combined approach is suitable for the collection and extraction of topsoil and subsoil solution for untargeted metabolomics under near-natural flow conditions.

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Selective successional transport of bacterial populations from rooted agricultural topsoil to deeper layers upon extreme precipitation events

Cited by 18 publications

References 55 publications

Predominance of Cand. Patescibacteria in Groundwater Is Caused by Their Preferential Mobilization From Soils and Flourishing Under Oligotrophic Conditions

Predominance of Cand. Patescibacteria in Groundwater Is Caused by Their Preferential Mobilization From Soils and Flourishing Under Oligotrophic Conditions

Metagenomic analysis reveals the predominance of Candidatus Patescibacteria in the rhizosphere of arecanut palms in yellow leaf disesase (YLD) endemic areas of India

Soil Solution Analysis With Untargeted GC–MS—A Case Study With Different Lysimeter Types

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