Radiocaesium in an organic soil and the effect of treatment with the fungicide ‘Captan’

Charles A. Shand, M.V. Cheshire, S. Smith, C.D. Campbell, P. Anderson, Christine M. Davidson, David Littlejohn, N. Jamieson

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Soil fungi accumulate radiocaesium from contaminated soil and it has been hypothesised that this may alter the plant availability and movement of the radionuclide in soil. The effect of twice-monthly addition of an aqueous suspension of the fungicide 'Captan' on the changes in a peaty podzol soil at 2 sites, contaminated 2 or 3 years earlier by the injection of Cs-134, has been quantified. The sites had different soil acidity and vegetation cover. The less acid soil (pH(water) 5.0) had been improved by the addition of lime and fertilizer and was reseeded with grass and clover. The more acid soil (pH(water) 3.8) was under hill grasses, herbs and heather. On both sites the addition of fungicide did not alter the amount or concentration of radiocaesium in plant material sampled monthly or the depth distribution of radiocaesium in the soil profile. The concentration of the fungal constituent, ergosterol, in the soil, measured monthly, was unaffected by the fungicide treatment but evidence was obtained from a pot experiment to show that ergosterol decomposes slowly in cold, wet soils. On the more acid soil, two weeks after the last application of fungicide, there was a decline in active fungi as measured by fluorescein diacetate staining. Chloroform fumigation of the more acid soil resulted in a small increase in the amount of Cs-134 exchangeable with 1 M ammonium acetate. Radiocaesium in seven different fungi grown in pure culture was found to be almost entirely extractable (> 95%) with 1 M ammonium acetate. Another, Amanita rubescens, showed some retention and 88% was extractable. These findings do not preclude the fungal biomass as an important soil component controlling plant availability of radiocaesium from acid, organic soils by maintaining radiocaesium in a biological cycle, but make it unlikely that any fixation by fungi in a chemical sense is involved.

LanguageEnglish
Pages315-322
Number of pages8
JournalPlant and Soil
Volume170
Issue number2
DOIs
Publication statusPublished - Mar 1995

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captan
fungicide
organic soils
organic soil
fungicides
acid soils
acid soil
soil pH
ammonium acetate
ergosterol
soil
fungus
fungi
Amanita
grasses
liming materials
acetate
water
soil fungi
ammonium

Keywords

  • captan
  • ergosterol
  • fungi
  • plant availability
  • organic soil
  • radiocaesium

Cite this

Shand, C. A., Cheshire, M. V., Smith, S., Campbell, C. D., Anderson, P., Davidson, C. M., ... Jamieson, N. (1995). Radiocaesium in an organic soil and the effect of treatment with the fungicide ‘Captan’. Plant and Soil, 170(2), 315-322. https://doi.org/10.1007/BF00010484
Shand, Charles A. ; Cheshire, M.V. ; Smith, S. ; Campbell, C.D. ; Anderson, P. ; Davidson, Christine M. ; Littlejohn, David ; Jamieson, N. / Radiocaesium in an organic soil and the effect of treatment with the fungicide ‘Captan’. In: Plant and Soil. 1995 ; Vol. 170, No. 2. pp. 315-322.
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Shand, CA, Cheshire, MV, Smith, S, Campbell, CD, Anderson, P, Davidson, CM, Littlejohn, D & Jamieson, N 1995, 'Radiocaesium in an organic soil and the effect of treatment with the fungicide ‘Captan’' Plant and Soil, vol. 170, no. 2, pp. 315-322. https://doi.org/10.1007/BF00010484

Radiocaesium in an organic soil and the effect of treatment with the fungicide ‘Captan’. / Shand, Charles A.; Cheshire, M.V.; Smith, S.; Campbell, C.D.; Anderson, P. ; Davidson, Christine M.; Littlejohn, David; Jamieson, N.

In: Plant and Soil, Vol. 170, No. 2, 03.1995, p. 315-322.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Radiocaesium in an organic soil and the effect of treatment with the fungicide ‘Captan’

AU - Shand, Charles A.

AU - Cheshire, M.V.

AU - Smith, S.

AU - Campbell, C.D.

AU - Anderson, P.

AU - Davidson, Christine M.

AU - Littlejohn, David

AU - Jamieson, N.

PY - 1995/3

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N2 - Soil fungi accumulate radiocaesium from contaminated soil and it has been hypothesised that this may alter the plant availability and movement of the radionuclide in soil. The effect of twice-monthly addition of an aqueous suspension of the fungicide 'Captan' on the changes in a peaty podzol soil at 2 sites, contaminated 2 or 3 years earlier by the injection of Cs-134, has been quantified. The sites had different soil acidity and vegetation cover. The less acid soil (pH(water) 5.0) had been improved by the addition of lime and fertilizer and was reseeded with grass and clover. The more acid soil (pH(water) 3.8) was under hill grasses, herbs and heather. On both sites the addition of fungicide did not alter the amount or concentration of radiocaesium in plant material sampled monthly or the depth distribution of radiocaesium in the soil profile. The concentration of the fungal constituent, ergosterol, in the soil, measured monthly, was unaffected by the fungicide treatment but evidence was obtained from a pot experiment to show that ergosterol decomposes slowly in cold, wet soils. On the more acid soil, two weeks after the last application of fungicide, there was a decline in active fungi as measured by fluorescein diacetate staining. Chloroform fumigation of the more acid soil resulted in a small increase in the amount of Cs-134 exchangeable with 1 M ammonium acetate. Radiocaesium in seven different fungi grown in pure culture was found to be almost entirely extractable (> 95%) with 1 M ammonium acetate. Another, Amanita rubescens, showed some retention and 88% was extractable. These findings do not preclude the fungal biomass as an important soil component controlling plant availability of radiocaesium from acid, organic soils by maintaining radiocaesium in a biological cycle, but make it unlikely that any fixation by fungi in a chemical sense is involved.

AB - Soil fungi accumulate radiocaesium from contaminated soil and it has been hypothesised that this may alter the plant availability and movement of the radionuclide in soil. The effect of twice-monthly addition of an aqueous suspension of the fungicide 'Captan' on the changes in a peaty podzol soil at 2 sites, contaminated 2 or 3 years earlier by the injection of Cs-134, has been quantified. The sites had different soil acidity and vegetation cover. The less acid soil (pH(water) 5.0) had been improved by the addition of lime and fertilizer and was reseeded with grass and clover. The more acid soil (pH(water) 3.8) was under hill grasses, herbs and heather. On both sites the addition of fungicide did not alter the amount or concentration of radiocaesium in plant material sampled monthly or the depth distribution of radiocaesium in the soil profile. The concentration of the fungal constituent, ergosterol, in the soil, measured monthly, was unaffected by the fungicide treatment but evidence was obtained from a pot experiment to show that ergosterol decomposes slowly in cold, wet soils. On the more acid soil, two weeks after the last application of fungicide, there was a decline in active fungi as measured by fluorescein diacetate staining. Chloroform fumigation of the more acid soil resulted in a small increase in the amount of Cs-134 exchangeable with 1 M ammonium acetate. Radiocaesium in seven different fungi grown in pure culture was found to be almost entirely extractable (> 95%) with 1 M ammonium acetate. Another, Amanita rubescens, showed some retention and 88% was extractable. These findings do not preclude the fungal biomass as an important soil component controlling plant availability of radiocaesium from acid, organic soils by maintaining radiocaesium in a biological cycle, but make it unlikely that any fixation by fungi in a chemical sense is involved.

KW - captan

KW - ergosterol

KW - fungi

KW - plant availability

KW - organic soil

KW - radiocaesium

U2 - 10.1007/BF00010484

DO - 10.1007/BF00010484

M3 - Article

VL - 170

SP - 315

EP - 322

JO - Plant and Soil

T2 - Plant and Soil

JF - Plant and Soil

SN - 0032-079X

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ER -