Fungal-to-bacterial ratios in soils investigated for enhanced C sequestration

Bailey, Vanessa; Smith, Jeffrey L.; Bolton, H.

doi:10.1016/s0038-0717(02)00033-0

Cited by 511 publications

(282 citation statements)

References 32 publications

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“…This might be explained by the very slight difference in the soil pH (0.3). The increased f/b ratio under poplar fits to the results of Bailey et al (2002), who found that dominance of fungal activity leads to increased C accumulation in soils.…”

Section: Resultssupporting

confidence: 84%

“…3: 95-100 Plant Soil Environ. also under wheat at another arable Cambisol in Germany (Ngosong et al 2010). It seems most probable that besides the increased labile C pool, lack of tillage under poplar significantly contributed to the wider f/b ratio, since more intensive tillage, as for wheat, can decrease the f/b ratio (Bailey et al 2002). The lower biomass of arbuscular mycorrhizal fungi under poplar than under wheat, might be explained by inter-fungal competition under the ectomycorrhizal host plant poplar.…”

Section: Resultsmentioning

confidence: 99%

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Impact of poplar on soil organic matter quality and microbial communities in arable soils

Baum¹,

Eckhardt²,

Hahn³

et al. 2013

PLANT SOIL ENVIRON

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Poplars grown in short rotation coppice on agricultural land are a promising bioenergy crop. This study aimed to evaluate the soil organic matter (SOM) quality and viable microbial consortium under six-years-old poplar (Populus maximowiczii) and under wheat (Triticum aestivum) at a test site in central Germany. The SOM molecular composition and stability was determined by pyrolysis-field ionization mass spectrometry (Py-FIMS). The microbial consortium was assessed in terms of microbial phospholipid fatty acid (PLFA) profiles. Py-FIMS and the PLFAs agreed in showing crop-specific differences in the SOM quality and in the associated microbial communities. Higher proportions of carbohydrates, long-chained fatty acids, sterols and suberins at the expense of N-containing compounds under poplar than under wheat were associated with lower concentrations of microbial PLFAs in the organic matter. A higher ratio of total fungal to bacterial (f/b) PLFAs, a lower ratio of Gram-positive to Gramnegative bacterial PLFAs and lower biomass of arbuscular mycorrhizal fungi in the organic matter were revealed under poplar than under wheat. Lower N-and increased C-availability in the SOM promoted fungal vs. bacterial colonization, increased the SOM stability by a lower decomposability and caused SOM accumulation under poplar.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Impact of poplar on soil organic matter quality and microbial communities in arable soils

Baum¹,

Eckhardt²,

Hahn³

et al. 2013

PLANT SOIL ENVIRON

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“…The results suggest that functional diversity was more sensitive than evenness to OTC hence that capacity of soil microbial community to utilize a wide range of substrates is very sensitive to OTC. OTC has been used to reduce or kill soil microbes to experimentally examine soil function (Bailey et al, 2002). However, our results indicate that the sensitivity of microbial species to OTC varies because the utilization of some substrate groups was affected to a greater extent than that of others.…”

Section: Discussionmentioning

confidence: 72%

The veterinary antibiotic oxytetracycline and Cu influence functional diversity of the soil microbial community

Kong

Zhu

et al. 2006

Environmental Pollution

219

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Oxytetracycline reduces the functional diversity of soil microbial community, and the combination of Cu and oxytetracycline leads to a further reduction. AbstractThere are increasing concerns over the effects of veterinary antibiotics and heavy metals in agricultural soils. The widely used veterinary antibiotic oxytetracycline (OTC), Cu and their combination on soil microbial community function were assessed with the Biolog method. The microbial community was extracted from the soil and exposed to a 0.85% sodium chloride solution containing OTC (0, 1, 5, 11, 43, 109 and 217 mM), or Cu (0, 10, 20, 100 and 300 mM), or combination of the two pollutants (OTC 0, 5, 11 mM and Cu 0, 20 mM). Functional diversity, evenness, average well color development (AWCD) and substrate utilization decreased significantly with increasing concentrations of OTC or Cu ( p < 0.005). The critical concentrations were 11 mM for OTC and 20 mM for Cu. The combination of OTC and Cu significantly decreased Shannon's diversity, evenness and utilization of carbohydrates and carboxylic acids compared to individual one of the contaminants. The antibiotic OTC and Cu had significant negative effects on soil microbial community function, particularly when both pollutants were present.

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“…The quality of the microbial community also changes in response to land use. Fungi increased relative to bacteria following prairie restoration, relative to a maize control [56]. Similarly, greater fungal representation was seen for microbes under reduced tillage [57].…”

Section: Discussionmentioning

confidence: 81%

Grasslands and Croplands Have Different Microbial Biomass Carbon Levels per Unit of Soil Organic Carbon

McGonigle

Turner

2017

Agriculture

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Primarily using cropped systems, previous studies have reported a positive linear relationship between microbial biomass carbon (MBC) and soil organic carbon (SOC). We conducted a meta-analysis to explore this relationship separately for grasslands and croplands using available literature. Studies were limited to those using fumigation-extraction for MBC for field samples. Trials were noted separately where records were distinct in space or time. Grasslands were naturally occurring, restored, or seeded. Cropping systems were typical of the temperate zone. MBC had a positive linear response to increasing SOC that was significant in both grasslands (p < 0.001; r 2 = 0.76) and croplands (p < 0.001; r 2 = 0.48). However, MBC increased 2.5-fold more steeply per unit of increasing SOC for grassland soils, as compared to the corresponding response in cropland soils. Expressing MBC as a proportion of SOC across the regression overall, slopes corresponded to 2.7% for grasslands and 1.1% for croplands. The slope of the linear relationship for grasslands was significantly (p = 0.0013) steeper than for croplands. The difference between the two systems is possibly caused by a greater proportion of SOC in grasslands being active rather than passive, relative to that in croplands, with that active fraction promoting the formation of MBC.

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Fungal-to-bacterial ratios in soils investigated for enhanced C sequestration

Cited by 511 publications

References 32 publications

Impact of poplar on soil organic matter quality and microbial communities in arable soils

Impact of poplar on soil organic matter quality and microbial communities in arable soils

The veterinary antibiotic oxytetracycline and Cu influence functional diversity of the soil microbial community

Grasslands and Croplands Have Different Microbial Biomass Carbon Levels per Unit of Soil Organic Carbon

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