The effect of oxygen concentration on the decomposition of organic materials in soil

Greenwood, D. J.

doi:10.1007/bf01666294

Cited by 195 publications

(82 citation statements)

References 17 publications

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“…This is the value quoted in Table 1. The smaller value of 0.16 cm obtained by Greenwood [11], and also quoted in Table 1, indicates the range of possible aggregate sizes, which may be found in different soils. Using the mean value provided by Smith for our aggregate size a, and taking the oxygen consumption rate λ = 2 × 10 −7 s −1 extracted from Smith [28] in Table 1 together with the value D 2 = 10 −6 cm 2 s −1 for a water-saturated aggregate from Currie [8], we obtain the estimate α = 23.9.…”

Section: Statement Of the Modelmentioning

confidence: 77%

“…For example, using Currie [8]'s estimates for D 2 in the case of a water-saturated aggregate and a dry aggregate from Table 1, we obtain δ = 0.5 × 10 −5 and δ = 0.05, respectively. Using instead Greenwood [11]'s estimate for D 2 quoted in Table 1 for a saturated aggregate, we obtain δ = 4.1 × 10 −5 . …”

Section: Statement Of the Modelmentioning

confidence: 93%

“…Using the mean value provided by Smith for our aggregate size a, and taking the oxygen consumption rate λ = 2 × 10 −7 s −1 extracted from Smith [28] in Table 1 together with the value D 2 = 10 −6 cm 2 s −1 for a water-saturated aggregate from Currie [8], we obtain the estimate α = 23.9. Using the smaller value of a = 0.16 provided by Greenwood [11], we obtain α = 0.02. It is clear, then, that quite a range of values of our dimensionless parameter α is appropriate for a real soil.…”

Section: Statement Of the Modelmentioning

confidence: 93%

“…Source 1 refers to Greenwood [11,12], Source 2 is Radford and Greenwood [27], Source 3 is Smith [28] and Source 4 is Currie [8]. The quoted values of the internal aggregate diffusivity D 2 are for (A) a water-saturated aggregate and (B) a dry aggregate…”

Section: Statement Of the Modelmentioning

confidence: 99%

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Oxygen uptake and denitrification in soil aggregates

Bocking

Blyth

2017

Acta Mech

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A mathematical model of oxygen uptake by bacteria in agricultural soils is presented with the goal of predicting anaerobic regions in which denitrification occurs. In an environment with a plentiful supply of oxygen, micro-organisms consume oxygen through normal respiration. When the local oxygen concentration falls below a threshold level, denitrification may take place leading to the release of nitrous oxide, a potent agent for global warming. A two-dimensional model is presented in which one or more circular soil aggregates are located at a distance below the ground level at which the prevailing oxygen concentration is prescribed. The level of denitrification is estimated by computing the area of any anaerobic cores, which may develop in the interior of the aggregates. The oxygen distribution throughout the model soil is calculated first for an aggregated soil for which the ratio of the oxygen diffusivities between an aggregate and its surround is small via an asymptotic analysis. Second, the case of a non-aggregated soil featuring one or more microbial hotspots, for which the diffusion ratio is arbitrary, is examined numerically using the boundary-element method.Calculations with multiple aggregates demonstrate a sheltering effect whereby some aggregates receive less oxygen than their neighbours. In the case of an infinite regular triangular network representing an aggregated soil, it is shown that there is an optimal inter-aggregate spacing which minimises the total anaerobic core area.

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Section: Statement Of the Modelmentioning

confidence: 77%

Section: Statement Of the Modelmentioning

confidence: 93%

Section: Statement Of the Modelmentioning

confidence: 93%

Section: Statement Of the Modelmentioning

confidence: 99%

See 2 more Smart Citations

Oxygen uptake and denitrification in soil aggregates

Bocking

Blyth

2017

Acta Mech

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“…Some essential parameters used are: initial amount of biomass: 1 o-s kg C per kg of dry soil; maximum relative growth rate 0.75X 10-s s-'; the half saturation value for oxygen respiration in water saturated soil crumbs: 1 o-3 mol 0 2 m-3 H 2 0 (Greenwood, 1961 ) ; half saturation value on glucose: 0.017 4 kg C m-3 H 2 0 (Shah and Coulman, 1978); maximum growth yields and maintenance coefficients on glucose as carbon source with oxygen as electron acceptor: 0.503 kg B kg-1 C and 0.212X 10-s kg C kg-1 B s-1 , respectively; similar values for oxygen (needed to calculate the oxygen consumption rate) were 0.65 kg B kg-1 0 2 and 0.382X 10-5 kg-1 0 2 kg-1 B s-1 , respectively.…”

Section: Microbiological Characteristicsmentioning

confidence: 99%

Water movement, oxygen supply and biological processes on the aggregate scale

Leffelaar

1993

Geoderma

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Factors affecting vegetation dieback of an oligohaline marsh in coastal Louisiana: Field manipulation of salinity and submergence

Webb

Mendelssohn

1996

American J of Botany

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Vegetation dieback is an important component of wetland loss in low salinity marshes of coastal Louisiana. A field experiment was conducted to determine the factors responsible for vegetation dieback within oligohaline marshes of Louisiana. Sections of marsh, dominated by Sagittaria lancifolia L., were transplanted into one of four locations depending on the treatment: (1) increased submergence—sods were lowered 15 cm below the donor marsh surface, (2) increased salinity—sods were transplanted into a higher salinity marsh and adjacent dieback pond, (3) increased salinity and submergence—sods were transplanted into a higher salinity marsh and adjacent dieback pond at 15 cm below the marsh surface, and (4) control—sods were exhumed and replaced at the ambient elevation of the donor marsh. Plant biomass and edaphic characteristics were measured after 5 mo. An increase in submergence caused decreased plant growth of the S. lancifolia‐dominated marsh community. An increase in salinities to 4–5 g/kg were not detrimental to plant growth. Although saltwater intrusion alone did not cause decreased growth of the S. lancifolia‐dominnled plant community, the combination of saltwater intrusion and increased plant submergence caused the greatest decrease in plant growth due to increased toxic sulfides and a likely reduction in the uptake of NH4‐N by the wetland vegetation. This illustrates that the dieback of oligohaline marsh vegetation can be alleviated by decreasing plant submergence even at salinities as high as 4.6 g/kg.

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The effect of oxygen concentration on the decomposition of organic materials in soil

Cited by 195 publications

References 17 publications

Oxygen uptake and denitrification in soil aggregates

Oxygen uptake and denitrification in soil aggregates

Water movement, oxygen supply and biological processes on the aggregate scale

Factors affecting vegetation dieback of an oligohaline marsh in coastal Louisiana: Field manipulation of salinity and submergence

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