Spatial uncoupling of biodegradation, soil respiration, and PAH concentration in a creosote contaminated soil

Bengtsson, Göran; Törneman, Niklas; Yang, Xiaoqing

doi:10.1016/j.envpol.2010.06.010

Cited by 12 publications

(3 citation statements)

References 34 publications

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“…Yet, the PAH content variability was greater in alfalfa than in ryegrass rhizosphere, suggesting an impact depending on plant species. This unstructured distribution commonly occurs in PAH-contaminated soil from the meter [ 42 ] to the centimeter-scale [ 3 ]. Several studies suggest that this kind of heterogeneous contaminated environment impacts microbial communities distribution and activity.…”

Section: Discussionmentioning

confidence: 99%

“…Geostatistical tools are also used to describe and establish spatial links between PAH contamination and soil physical, chemical and biological characteristics. Positive relationships between PAH hotspots and organic carbon concentrations [ 41 ], fungal biomass [ 42 ], bacterial diversity and ring-hydroxylating dioxygenase gene abundance [ 43 ], was established at the meter scale in aged-polluted soils. At finer (millimeter to centimeter) scale in urban roadside soil, the spatial heterogeneity of PAH-mineralization potential [ 3 ] was highlighted, but the distribution of PAHs and PAH-degraders was not correlated [ 44 ].…”

Section: Introductionmentioning

confidence: 99%

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Mapping the Centimeter-Scale Spatial Variability of PAHs and Microbial Populations in the Rhizosphere of Two Plants

et al. 2015

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Rhizoremediation uses root development and exudation to favor microbial activity. Thus it can enhance polycyclic aromatic hydrocarbon (PAH) biodegradation in contaminated soils. Spatial heterogeneity of rhizosphere processes, mainly linked to the root development stage and to the plant species, could explain the contrasted rhizoremediation efficiency levels reported in the literature. Aim of the present study was to test if spatial variability in the whole plant rhizosphere, explored at the centimetre-scale, would influence the abundance of microorganisms (bacteria and fungi), and the abundance and activity of PAH-degrading bacteria, leading to spatial variability in PAH concentrations. Two contrasted rhizospheres were compared after 37 days of alfalfa or ryegrass growth in independent rhizotron devices. Almost all spiked PAHs were degraded, and the density of the PAH-degrading bacterial populations increased in both rhizospheres during the incubation period. Mapping of multiparametric data through geostatistical estimation (kriging) revealed that although root biomass was spatially structured, PAH distribution was not. However a greater variability of the PAH content was observed in the rhizosphere of alfalfa. Yet, in the ryegrass-planted rhizotron, the Gram-positive PAH-degraders followed a reverse depth gradient to root biomass, but were positively correlated to the soil pH and carbohydrate concentrations. The two rhizospheres structured the microbial community differently: a fungus-to-bacterium depth gradient similar to the root biomass gradient only formed in the alfalfa rhizotron.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mapping the Centimeter-Scale Spatial Variability of PAHs and Microbial Populations in the Rhizosphere of Two Plants

et al. 2015

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“…Such heterogeneity might result from accidental spills or production/treatment facilities that create hot spots of pollutants. Subsequently, the spatial variation of pollutants and other soil chemical parameters may regulate the spatial patterns of microbial communities (Tö rneman et al, 2008;Bengtsson et al, 2010). Association between spatial patterns of environmental factors and the distribution of microbial taxa as well as their activities can be elucidated via geostatistical modelling (Philippot et al, 2009;Bru et al, 2010;Enwall et al, 2010;Wessén et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Spatial patterns of microbial diversity and activity in an aged creosote-contaminated site

et al. 2014

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Restoration of polluted sites via in situ bioremediation relies heavily on the indigenous microbes and their activities. Spatial heterogeneity of microbial populations, contaminants and soil chemical parameters on such sites is a major hurdle in optimizing and implementing an appropriate bioremediation regime. We performed a grid-based sampling of an aged creosote-contaminated site followed by geostatistical modelling to illustrate the spatial patterns of microbial diversity and activity and to relate these patterns to the distribution of pollutants. Spatial distribution of bacterial groups unveiled patterns of niche differentiation regulated by patchy distribution of pollutants and an east-to-west pH gradient at the studied site. Proteobacteria clearly dominated in the hot spots of creosote pollution, whereas the abundance of Actinobacteria, TM7 and Planctomycetes was considerably reduced from the hot spots. The pH preferences of proteobacterial groups dominating in pollution could be recognized by examining the order and family-level responses. Acidobacterial classes came across as generalists in hydrocarbon pollution whose spatial distribution seemed to be regulated solely by the pH gradient. Although the community evenness decreased in the heavily polluted zones, basal respiration and fluorescein diacetate hydrolysis rates were higher, indicating the adaptation of specific indigenous microbial populations to hydrocarbon pollution. Combining the information from the kriged maps of microbial and soil chemistry data provided a comprehensive understanding of the long-term impacts of creosote pollution on the subsurface microbial communities. This study also highlighted the prospect of interpreting taxa-specific spatial patterns and applying them as indicators or proxies for monitoring polluted sites.

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Rhizoremediation in Cold Climates

Yrjälä

Sipilä

Mukherjee

2017

Psychrophiles: From Biodiversity to Biotechnology

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Spatial uncoupling of biodegradation, soil respiration, and PAH concentration in a creosote contaminated soil

Cited by 12 publications

References 34 publications

Mapping the Centimeter-Scale Spatial Variability of PAHs and Microbial Populations in the Rhizosphere of Two Plants

Mapping the Centimeter-Scale Spatial Variability of PAHs and Microbial Populations in the Rhizosphere of Two Plants

Spatial patterns of microbial diversity and activity in an aged creosote-contaminated site

Rhizoremediation in Cold Climates

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