Effect of Sieving on Ex Situ Soil Respiration of Soils from Three Land Use Types

Adekanmbi, Adetunji Alex; Shaw, Liz J.; Sizmur, Tom

doi:10.1007/s42729-020-00177-2

Cited by 16 publications

(14 citation statements)

References 24 publications

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“…Subsequently, this deposition of suspended riverine sediments/POM by flood water results in the floodplain topsoil becoming a sink for PTEs (Du Laing et al, 2009;Frohne et al, 2011;Nshimiyimana et al, 2014;Overesch et al, 2007;Rinklebe et al, 2007;Visser et al, 2012;Zhao and Marriott, 2013). As a result, floodplain topsoil (uppermost 15cm) can often initially contain elevated concentrations of PTEs such as the metalloid; arsenic (As), and metals; chromium (Cr), copper (Cu), lead (Pb), and zinc (Zn), but later due to post-depositional reactions with organic matter/other organic components the PTEs concentrations will vary (Adekanmbi et al, 2020;Ciszewski and Grygar, 2016;Hurley et al, 2017;Izquierdo et al, 2013;Jiao et al, 2014;Kelly et al, 2020). When laboratory experiments are undertaken on samples gathered from floodplain site, soils are collected as single or composite samples, air or oven dried and then homogenised, resulting in a loss of soil stratigraphy and therefore the potential differences in PTEs concentration with depth may be unaccounted for (Ciszewski and Grygar, 2016).…”

Section: Changes That Floodplain Soils Undergo During and After Inundationmentioning

confidence: 99%

The impact of increased flooding occurrence on the mobility of potentially toxic elements in floodplain soil – A review

Ponting

Kelly

Verhoef

et al. 2021

Science of The Total Environment

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110

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The frequency and duration of flooding events are increasing due to land-use changes increasing runoff of precipitation, and climate change causing more intense rainfall events. Floodplain soils situated downstream of urban or industrial catchments, which were traditionally considered a sink of potentially toxic elements (PTEs) arriving from the river reach, may now become a source of legacy pollution to the surrounding environment if PTEs are mobilised by unprecedented flooding events.When a soil floods, the mobility of PTEs can increase or decrease due to the net effect of five key processes; (i) the soil redox potential decreases which can directly alter the speciation, and hence mobility, of redox sensitive PTEs (e.g. Cr, As), (ii) pH increases which usually decreases the mobility of metal cations (e.g. Cd 2+ , Cu 2+ , Ni 2+ , Pb 2+ , Zn 2+ ), (iii) dissolved organic matter (DOM) increases, which chelates and mobilises PTEs, (iv) Fe and Mn hydroxides undergo reductive dissolution, releasing adsorbed and co-precipitated PTEs, and (v) sulphate is reduced and PTEs are immobilised due to precipitation of metal sulphides. These factors may be independent mechanisms, but they interact with one another to affect the mobility of PTEs, meaning the effect of flooding on PTE mobility is not easy to predict. Many of the processes involved in mobilising PTEs are microbially mediated, temperature dependent and the kinetics are poorly understood.Soil mineralogy and texture are properties that change spatially and will affect how the mobility of PTEs in a specific soil may be impacted by flooding. As a result, knowledge based on one river catchment may not be particularly useful for predicting the impacts of flooding at another site. This review provides a critical discussion of the mechanisms controlling the mobility of PTEs in floodplain soils. It summarises current understanding, identifies limitations to existing knowledge, and highlights requirements for further research.

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Section: Changes That Floodplain Soils Undergo During and After Inundationmentioning

confidence: 99%

The impact of increased flooding occurrence on the mobility of potentially toxic elements in floodplain soil – A review

Ponting

Kelly

Verhoef

et al. 2021

Science of The Total Environment

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110

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“…1:1 lines are shown for comparison. homogenized, and assigned to experimental units (Adekanmbi et al 2020). However, it is still unclear how well the conditions in the intact cores really do reflect the natural environment, and work is underway to make observations on the impact of a real flooding event on trace element mobility in the field at this site.…”

Section: Resultsmentioning

confidence: 99%

“…Because the present study used intact soil cores, porewater concentrations were likely to more closely reflect those that might be found in the natural environment rather than soil samples that were sieved, homogenized, and assigned to experimental units (Adekanmbi et al 2020). However, it is still unclear how well the conditions in the intact cores really do reflect the natural environment, and work is underway to make observations on the impact of a real flooding event on trace element mobility in the field at this site.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Flooding and Drainage Duration on the Release of Trace Elements from Floodplain Soils

Kelly

Hamilton

Watts

et al. 2020

Enviro Toxic and Chemistry

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Floodplains downstream of urban catchments are sinks for potentially toxic trace elements. An intensification of the hydrological cycle and changing land use will result in floodplains becoming inundated for longer durations in the future. We collected intact soil cores from a floodplain meadow downstream of an urban catchment and subjected them to an inundation/drainage cycle in the laboratory to investigate the effect of flood duration on trace element concentrations in the soil porewater. The porewater concentrations of Ni, Cr, and Zn increased, whereas Cu and Pb decreased with flood duration. All the Cr present in porewaters was identified as Cr(III). Copper concentrations increased after drainage but Pb mobility remained suppressed. Both pH and dissolved organic carbon (DOC) increased with flood duration but were lower in treatments that were drained for the longest duration (which were also the treatments flooded for the shortest duration). The porewater concentrations of Cr and Ni decreased after drainage to levels below those observed before inundation, mirroring the DOC concentrations. We concluded that the duration of floodplain inundation does have an influence on the environmental fate of trace elements but that flooding does not influence all trace elements in the same way. The implications of an intensification of the hydrological cycle over the coming decades are that floodplains may become a source of some trace elements to aquatic and terrestrial ecosystems.

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“…Field moist soil samples of 70 g fresh weight (equivalent to 56.51 g dry weight) were weighed into a 5 x 5 cm cylinder (height x diameter; volume = 98.22 cm 3 ) and placed in a 320 ml gastight container (Figure 1C). The containers were modified to allow gas collection ports, which were covered with Parafilm® to reduce moisture loss (but allow gas exchange) when not in use, following Adekanmbi et al (2020). The soils were adjusted to 60% of their water holding capacity, as described by Yang et al, (2017).…”

Section: Experimental Setup and Co2 Flux Measurementsmentioning

confidence: 99%

Legacy effect of constant and diurnally oscillating temperatures on soil respiration and microbial community structure

Adekanmbi

Shu

Zhou

et al. 2021

Preprint

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Laboratory incubation studies evaluating the temperature sensitivity of soil respiration often use measurements of respiration taken at a constant incubation temperature from soil that has been pre-incubated at the same constant temperature. However, such constant temperature incubations do not represent the field situation where soils undergo diurnal temperature oscillations. We investigated the effects of constant and diurnally oscillating temperatures on soil respiration and soil microbial community composition. A grassland soil from the UK was either incubated at a constant temperature of 5 ℃, 10 ℃, or 15 ℃, or diurnally oscillated between 5 ℃ and 15 ℃. Soil CO2 flux was measured by temporarily moving incubated soils from each of the abovementioned treatments to 5 ℃, 10 ℃ or 15 ℃, such that soils incubated at each temperature had CO2 flux measured at every temperature. We hypothesised that, irrespective of measurement temperature, CO2 emitted from the 5 ℃ to 15 ℃ oscillating incubation would be most similar to the soil incubated at 10 ℃. The results showed that both incubation and measurement temperatures influence soil respiration. Incubating soil at a temperature oscillating between 5 ℃ and 15 ℃ resulted in significantly greater CO2 flux than constant incubations at 10 ℃ or 5 ℃, but was not significantly different to the 15 ℃ incubation. The greater CO2 flux from soils incubated at 15 ℃, or oscillating between 5 ℃ and 15 ℃, coincided with a depletion of dissolved organic carbon and a shift in the phospholipid fatty acid profile of the soil microbial community, consistent with the thermal adaptation of microbial communities to higher temperatures. However, diurnal temperature oscillation did not significantly alter Q10. Our results suggest that daily maximum temperatures are more important than daily minimum or daily average temperatures when considering the response of soil respiration to warming.

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Effect of Sieving on Ex Situ Soil Respiration of Soils from Three Land Use Types

Cited by 16 publications

References 24 publications

The impact of increased flooding occurrence on the mobility of potentially toxic elements in floodplain soil – A review

The impact of increased flooding occurrence on the mobility of potentially toxic elements in floodplain soil – A review

The Effect of Flooding and Drainage Duration on the Release of Trace Elements from Floodplain Soils

Legacy effect of constant and diurnally oscillating temperatures on soil respiration and microbial community structure

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