Combined use of empirical data and mathematical modelling to better estimate the microbial turnover of isotopically labelled carbon substrates in soil

Glanville, Helen; Hill, Paul W.; Schnepf, Andrea; Oburger, Eva; Jones, Davey L.

doi:10.1016/j.soilbio.2015.11.016

Cited by 75 publications

(72 citation statements)

References 48 publications

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“…This could be due to the microorganisms increasingly using 14 C for energy production and cell-maintenance activities (e.g., generation of heat shock proteins, membrane lipid renewal) rather than for growth and storage [41]. This result is consistent with [55], who also showed that the size of C pool a 1 was sensitive to temperature.…”

Section: Don Compounds Mineralization and Half-lifesupporting

confidence: 71%

“…Parameters a 1 and a 2 represent the size (% of total 14 C added) of the fast and slow 14 C turnover pools respectively [22,41]. k 1 is the rate constant describing the turnover rate of C pool a 1 which is ascribed to the immediate use of substrate-derived 14 C in catabolic processes (i.e., respiration).…”

Section: Rate Of 14 C-labelled Substrate Mineralization In Soilmentioning

confidence: 99%

“…k 1 is the rate constant describing the turnover rate of C pool a 1 which is ascribed to the immediate use of substrate-derived 14 C in catabolic processes (i.e., respiration). k 2 is the rate constant describing the turnover of C pool a 2 and is attributed to the second slower phase of 14 CO 2 production associated with turnover of substrate-derived 14 C immobilised in the microbial biomass [41]. The half-life (t 1 2 ) of pool a 1 is defined as:…”

Section: Rate Of 14 C-labelled Substrate Mineralization In Soilmentioning

confidence: 99%

“…The similarity between agricultural soil sites or depths could be due to their similar soil PLFA microbial communities and to the commonality in metabolic pathways for processing LMW DON or DOC [58]. This could also be due in part to a diverse microbial community having similar affinity transporters for substrate uptake from soil [41]. The lack of influence of soil depth on substrate use in this study differed from [59], who showed that soil depth greatly influenced substrate utilization due to higher microbial activity, biomass, organic matter, C content, and soil pH in topsoil compared to subsoils.…”

Section: Don Compounds Mineralization and Half-lifementioning

confidence: 99%

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Substrate Influences Temperature Sensitivity of Dissolved Organic Carbon (DOC) and Nitrogen (DON) Mineralization in Arid Agricultural Soils

2018

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Abstract:The bioavailability of nitrogen (N) in soil relies on the progressive breakdown of necromass protein to peptide and amino acid components and conversion to inorganic N forms. We understand the fluxes and pathways of the N cycle downstream from amino acids, but our understanding of the factors controlling peptide and amino acid mineralization, particularly in arid soils, is lacking. We investigated the influence of temperature on the rate of dissolved organic carbon (DOC) and nitrogen (DON) cycling in three agricultural soils from Saudi Arabia. Although the physical and chemical properties of the soils differed markedly, phospholipid fatty acid (PLFA) analysis revealed they had similar topsoil and subsoil microbial communities. Soils behaved similarly in terms of the rate of substrate use, microbial C-use efficiency, and response to temperature. Substrate mineralization rate increased with temperature with more C being allocated to microbial catabolic rather than anabolic processes. Our results show that climate change is likely to lead to changes in soil organic matter turnover and shift C allocation patterns within the soil microbial community. This is expected to reduce soil quality and exacerbate nutrient losses. Management strategies are required to promote the retention of organic matter in these soils.

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Section: Don Compounds Mineralization and Half-lifesupporting

confidence: 71%

Section: Rate Of 14 C-labelled Substrate Mineralization In Soilmentioning

confidence: 99%

Section: Rate Of 14 C-labelled Substrate Mineralization In Soilmentioning

confidence: 99%

Section: Don Compounds Mineralization and Half-lifementioning

confidence: 99%

See 2 more Smart Citations

Substrate Influences Temperature Sensitivity of Dissolved Organic Carbon (DOC) and Nitrogen (DON) Mineralization in Arid Agricultural Soils

2018

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“…The 40% release should not be interpreted as if only 40% of the compound was degraded, but rather that 60% of the mineralized compound was used as a carbon source for microbial 275 growth. This is a generally accepted interpretation of mineralization curves that often go to yields of only 40-50% with the remaining part incorporated into biomass that is only slowly mineralized along with microbial turnover (Nowak et Glanville et al, 2016). Just after incubation, we extracted non-degraded or metabolized BVOCs with methanol, and only sterilized samples released a major pool of methanol-extractable 14 C (typically between 50 and 95%) while non-sterilized samples released less than 5%.…”

mentioning

confidence: 99%

Rapid mineralization of biogenic volatile organic compounds in temperate and Arctic soils

Albers¹,

Kramshøj²,

Rinnan³

2018

Preprint

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Abstract. Biogenic volatile organic compounds (BVOCs) are produced by all life forms. Their release into the atmosphere is important with regards to a number of physical and chemical processes and great effort has been put into determining sources and sinks of these compounds in recent years. Soil microbes as a possible sink for BVOCs in the atmosphere has been suggested, however, experimental evidence for this sink is scarce despite its potentially high importance to both carbon cycling and atmospheric concentrations of these gases. We therefore conducted a study with a number of commonly occurring BVOCs labelled with 14C and modified existing methods to study mineralization of these compounds to 14CO2 in four different top soils. Five of the six BVOCs were rapidly mineralized by microbes in all soils. However, great differences were observed with regards to speed of mineralization, extent of mineralization and variation between soil types. Methanol, benzaldehyde, acetophenone and the oxygenated monoterpene geraniol were mineralized within hours in all soils. The hydrocarbon monoterpene p-cymene was mineralized rapidly in soil from a coniferous forest but slower in soil from and adjacent beech stand while chloroform was mineralized slowly in all soils. From our study it is clear that soil microbes are able to degrade completely BVOCs released by aboveground vegetation as well as BVOCs released by soil microbes and plant roots. In addition to the possible atmospheric implications of this degradation the very fast mineralization rates are likely important in shaping the net BVOC emissions from soil and it is possible that BVOC formation and degradation may be an important but little recognized part of internal carbon cycling in soil.

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Simazine degradation in agroecosystems: Will it be affected by the type and amount of microplastic pollution?

et al. 2022

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Plastics and herbicides represent two of the most extensive and persistent anthropogenic contaminants entering agroecosystems. The synergistic interaction of these pollutants on soil health, however, remains poorly understood. For the first time, we investigated the behavior of a common selective triazine herbicide (simazine) in soil containing 0%, 1%, 5%, 10%, and 20% (w/w) of two commonly found microplastics, namely polyethylene (PE) and polyvinyl chloride (PVC). The mineralization of 14 Clabeled simazine in soil decreased with the presence of both PE and PVC as indicated by the lower total 14 CO 2 loss. Consequently, the half-life of simazine increased in the presence of microplastics, although there was little difference between microplastic types. The ratio of fungi-to-bacteria in the soil increased by 9%-18% after 1% of microplastics addition, while enzyme activities involved in C-cycling decreased by 20%-46% in soil amended with PVC relative to the control. Further, enzyme activities were negatively correlated with the half-life of simazine when added with PVC.Therefore, we ascribe the repression in simazine degradation to changes in microbial community structure (increased fungi-to-bacteria ratio) and reduced enzyme activities. Overall, microplastics accumulation in soil decreases herbicide breakdown resulting in herbicide residuals remaining, which in turn, may increase their risk of reaching ground or surface waters.

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Combined use of empirical data and mathematical modelling to better estimate the microbial turnover of isotopically labelled carbon substrates in soil

Cited by 75 publications

References 48 publications

Substrate Influences Temperature Sensitivity of Dissolved Organic Carbon (DOC) and Nitrogen (DON) Mineralization in Arid Agricultural Soils

Substrate Influences Temperature Sensitivity of Dissolved Organic Carbon (DOC) and Nitrogen (DON) Mineralization in Arid Agricultural Soils

Rapid mineralization of biogenic volatile organic compounds in temperate and Arctic soils

Simazine degradation in agroecosystems: Will it be affected by the type and amount of microplastic pollution?

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