Three-dimensional Microorganization of the Soil–Root–Microbe System

Feeney, Debbie S.; Crawford, John W.; Daniell, Tim J.; Hallett, Paul D.; Nunan, Naoise; Ritz, Karl; Rivers, Mark L.; Young, Iain M.

doi:10.1007/s00248-006-9062-8

Cited by 236 publications

(155 citation statements)

References 23 publications

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“…On golf course soils, York and Canaway (2000) showed a direct link between the presence of basidiomycetes fungi and the development of fairy rings. Feeney et al (2006a) found a strong relationship between fungal biomass and water repellency in an agricultural soil. However, this could not be simulated in a study that controlled fungal biomass with biocides in the laboratory (Feeney et al 2006b).…”

Section: Review Soil and Water Res 3 2008 (Special Issue 1): S21-s29mentioning

confidence: 90%

A brief overview of the causes, impacts and amelioration of soil water repellency - a review

Hallett¹

2008

Soil Water Res.

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This article describes the phenomenon of soil water repellency, starting from the fundamental principals of water transport and storage in soil. Soil water repellency is a reduction in the rate of wetting and retention of water in soil caused by the presence of hydrophobic coatings on soil particles. For crop production and the maintenance of amenity turf, water repellency can stress plants resulting in poorer yield quality or grass 'playability' , respectively. The biological causes of water repellency, primarily the influence of fungi, will be discussed, as an understanding of the source of the problem will be beneficial in developing solutions. Exacerbation of repellency through climate change and the use of 'engineered' soils for amenity surfaces will be demonstrated using research findings from around the globe. In developing solutions to soil water repellency, its positive benefits, if maintained at very low levels, need to be considered. Water repellency is a key process in the physical stabilisation of soil and its impact on evaporation also needs to be considered. Before developing a rapid solution to repellency based only on water transport rates, a holistic understanding of the impacts on soil water relations is essential.

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Section: Review Soil and Water Res 3 2008 (Special Issue 1): S21-s29mentioning

confidence: 90%

A brief overview of the causes, impacts and amelioration of soil water repellency - a review

Hallett¹

2008

Soil Water Res.

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“…Soil fungi may influence abiotic properties of their environment through the production or decomposition of hydrophilic and hydrophobic organic compounds that influence water transport and retention (Feeney et al, 2006;Czarnes et al, 2000;Roper, 2004). These processes will affect water availability to plants and microbes, pollutant transport through bypass flow, rainfall infiltration and overland runoff, and the stability of the soil structure by reducing slaking stresses imposed by rapid wetting (Hallett & Young, 1999).…”

Section: Introductionmentioning

confidence: 99%

Impact of basidiomycete fungi on the wettability of soil contaminated with a hydrophobic polycyclic aromatic hydrocarbon

Hallett¹,

White

Ritz

2006

Biologia

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Polyaromatic hydrocarbons (PAHs) present a challenge to bioremediation because they are hydrophobic, thus influencing the water availability and repellency of soil. The addition of different concentrations of the PAH, anthracene, showed it to induce moderate levels of repellency. We investigated the efficacy of three basidiomycete fungal species on improving the wettability of soil by reducing repellency caused by contamination of soil with 7 ppm anthracene. A microcosm system was used that enabled determination of the impact of fungi on wettability at three locations down a 30 mm deep repacked soil core. Before incubation with fungi, the contaminated soil had a repellency of R = 3.12 ± 0.08 (s.e.). After 28 days incubation, Coriolus versicolor caused a significant reduction in repellency to R = 1.79 ± 0.35 (P < 0.001) for the top section of the soil in a microcosm. Phanerochaete chrysosporium and Phlebia radiata did not influence repellency. None of the fungi had an effect at 20 mm depth.

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“…Moreover, the impact of soil moisture, plant species and soil type also needs to be investigated. Greater emphasis on the underlying processes driving changes in water repellency under elevated CO 2 , using approaches similar to those reported by Feeney et al (2004Feeney et al ( , 2006 and Hallett et al (2003), will be the subject of future research.…”

Section: Discussionmentioning

confidence: 94%

“…Several studies have found microbial and plant biomass influences the development of water repellency in soil (Feeney et al 2004;Feeney et al 2006;Hallett et al 2003). Under elevated atmospheric CO 2 , we hypothesise that an increase in plant biomass will drive an increase in water repellency, either directly or through secondary microbial processes.…”

Section: Introductionmentioning

confidence: 85%

Rise in CO2 affects soil water transport through repellency

Gordon¹,

Hallett²

2009

Biologia

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Several studies have shown improved soil stability under elevated atmospheric CO2 caused by increased plant and microbial biomass. These studies have not quantified the mechanisms responsible for soil stabilisation or the effect on water relations. The objective of this study was to assess changes in water repellency under elevated CO2. We hypothesised that increased plant biomass will drive an increase in water repellency, either directly or through secondary microbial processes. Barley plants were grown at ambient (360 ppm) and elevated (720 ppm) CO2 concentrations in controlled chambers. Each plant was grown in a separate tube of 1.2 m length constructed from 22 mm depth × 47 mm width plastic conduit trunk and packed with sieved arable soil to 55% porosity. After 10 weeks growth the soil was dried at 40• C before measuring water sorptivity, ethanol sorptivity and repellency at many depths with a 0.14 mm radius microinfiltrometer. This provided a microscale measure of the capacity of soil to rewet after severe drying. At testing roots extended throughout the depth of the soil in the tube. The depth of the measurement had no effect on sorptivity or repellency. A rise in CO2 resulted in a decrease in water sorptivity from 1.13 ± 0.06 (s.e) mm s −1/2 to 1.00 ± 0.05 mm s −1/2 (P < 0.05) and an increase in water repellency from 1.80 ± 0.09 to 2.07 ± 0.08 (P < 0.05). Ethanol sorptivity was not affected by CO2 concentration, suggesting a similar pore structure. Repellency was therefore the primary cause of decreased water sorptivity. The implications will be both positive and negative, with repellency potentially increasing soil stability but also causing patchier wetting of the root-zone.

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Three-dimensional Microorganization of the Soil–Root–Microbe System

Cited by 236 publications

References 23 publications

A brief overview of the causes, impacts and amelioration of soil water repellency - a review

A brief overview of the causes, impacts and amelioration of soil water repellency - a review

Impact of basidiomycete fungi on the wettability of soil contaminated with a hydrophobic polycyclic aromatic hydrocarbon

Rise in CO2 affects soil water transport through repellency

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