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Title: High plant uptake of radiocesium from organic soils due to Cs mobility and low soil K content

Abstract

Post-Chernobyl experience has demonstrated that persistently high plant transfer of {sup 137}Cs occurs from organic soils in upland and seminatural ecosystems. The soil properties influencing this transfer have been known for some time but have not been quantified. A pot experiment was conducted using 23 soils collected from selected areas of Great Britain, which were spiked with {sup 134}Cs, and Agrostis capillaris grown for 19--45 days. The plant-to-soil {sup 134}Cs concentration ratio (CR) varied from 0.06 to 44; log CR positively correlated to soil organic matter content (R{sup 2} = 0.84), and CR values were highest for soils with low distribution coefficients (K{sub d}) of {sup 134}Cs. Soils with high organic matter contents and high concentrations of NH{sub 4}{sup +} in solution showed high {sup 134}Cs mobility (low K{sub d}). The plant-to-soil solution {sup 134}Cs ratio decreased sharply with increasing soil solution K{sup +}. A two parameter linear model, used to predict log CR from soil solution K{sup +} and K{sub d}, explained 94% of the variability in CR values. In conclusion, the high transfer of {sup 134}Cs in organic soils is related to both the high {sup 134}Cs mobility (low clay content and high NH{sub 4}{sup +} concentrations) andmore » low K availability.« less

Authors:
; ; ; ; ; ;  [1];  [2];  [3]
  1. Merlewood Research Station, Cumbria (United Kingdom). Inst. of Terrestrial Ecology
  2. K.U. Leuven, Heverlee (Belgium)
  3. Univ. of Wales (United Kingdom). Inst. of Terrestrial Ecology
Publication Date:
OSTI Identifier:
687393
Resource Type:
Journal Article
Journal Name:
Environmental Science and Technology
Additional Journal Information:
Journal Volume: 33; Journal Issue: 16; Other Information: PBD: 15 Aug 1999
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 56 BIOLOGY AND MEDICINE, APPLIED STUDIES; SOILS; CONTAMINATION; CESIUM 134; ROOT ABSORPTION; POTASSIUM; MATHEMATICAL MODELS; GRAMINEAE

Citation Formats

Sanchez, A.L., Wright, S.M., Naylor, C., Kennedy, V.H., Dodd, B.A., Singleton, D.L., Barnett, C.L., Smolders, E., and Stevens, P.A. High plant uptake of radiocesium from organic soils due to Cs mobility and low soil K content. United States: N. p., 1999. Web. doi:10.1021/es990058h.
Sanchez, A.L., Wright, S.M., Naylor, C., Kennedy, V.H., Dodd, B.A., Singleton, D.L., Barnett, C.L., Smolders, E., & Stevens, P.A. High plant uptake of radiocesium from organic soils due to Cs mobility and low soil K content. United States. doi:10.1021/es990058h.
Sanchez, A.L., Wright, S.M., Naylor, C., Kennedy, V.H., Dodd, B.A., Singleton, D.L., Barnett, C.L., Smolders, E., and Stevens, P.A. Sun . "High plant uptake of radiocesium from organic soils due to Cs mobility and low soil K content". United States. doi:10.1021/es990058h.
@article{osti_687393,
title = {High plant uptake of radiocesium from organic soils due to Cs mobility and low soil K content},
author = {Sanchez, A.L. and Wright, S.M. and Naylor, C. and Kennedy, V.H. and Dodd, B.A. and Singleton, D.L. and Barnett, C.L. and Smolders, E. and Stevens, P.A.},
abstractNote = {Post-Chernobyl experience has demonstrated that persistently high plant transfer of {sup 137}Cs occurs from organic soils in upland and seminatural ecosystems. The soil properties influencing this transfer have been known for some time but have not been quantified. A pot experiment was conducted using 23 soils collected from selected areas of Great Britain, which were spiked with {sup 134}Cs, and Agrostis capillaris grown for 19--45 days. The plant-to-soil {sup 134}Cs concentration ratio (CR) varied from 0.06 to 44; log CR positively correlated to soil organic matter content (R{sup 2} = 0.84), and CR values were highest for soils with low distribution coefficients (K{sub d}) of {sup 134}Cs. Soils with high organic matter contents and high concentrations of NH{sub 4}{sup +} in solution showed high {sup 134}Cs mobility (low K{sub d}). The plant-to-soil solution {sup 134}Cs ratio decreased sharply with increasing soil solution K{sup +}. A two parameter linear model, used to predict log CR from soil solution K{sup +} and K{sub d}, explained 94% of the variability in CR values. In conclusion, the high transfer of {sup 134}Cs in organic soils is related to both the high {sup 134}Cs mobility (low clay content and high NH{sub 4}{sup +} concentrations) and low K availability.},
doi = {10.1021/es990058h},
journal = {Environmental Science and Technology},
number = 16,
volume = 33,
place = {United States},
year = {1999},
month = {8}
}