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Journal of Environmental Quality Abstract -

Radiocesium Uptake by One-Year-Old Willows Planted as Short Rotation Coppice

 

This article in JEQ

  1. Vol. 29 No. 5, p. 1384-1390
     
    Received: May 7, 1999


    * Corresponding author(s): ythiry@sckcen.be
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doi:10.2134/jeq2000.00472425002900050003x
  1. A. Gommers,
  2. Y. Thiry *,
  3. H. Vandenhove,
  4. C. M. Vandecasteele,
  5. E. Smolders and
  6. R. Merckx
  1. SCK·CEN, Radiation Protection Research Unit, Radioecology Section, Boeretang 200, 2400 Mol, Belgium;
    Dep. of Land Management, Lab. of Soil Fertility and Soil Biology, K.U. Leuven, K. Mercierlaan 92, 3001 Heverlee, Belgium.

Abstract

Abstract

High radioactivity concentrations in foodcrops grown in areas contaminated by the Chernobyl accident continue to justify the consideration of a change in land use. Production of biofuel may be one of the alternatives to food production. However, present knowledge about radionuclide cycling in such systems is limited. In the present study, radiocesium uptake and distribution were measured in a willow (Salix viminalis L. var. Orm) short rotation coppice (SRC) stand. This system allows production of energy from the harvested biomass. Experimental plots were established on two soil types of contrasting texture (loamy versus sandy), and contaminated with 8 × 106 Bq 134Cs m−2. Concentrations of 134Cs were measured in wood, litter, roots, and cuttings after 1 yr of growth. At the end of the growing season, only 0.0012% (loamy soil) and 0.0065% (sandy soil) of the initial radiocesium was transferred to the plant biomass (including belowground plant parts). Stem wood contained the lowest concentration of 134Cs among all plant parts analyzed. Wood radiocesium concentrations were 82 Bq kg−1 for the loamy soil and 192 Bq kg−1 for the sandy soil. These values are well below the exemption limit for fuel wood put forward in the Commonwealth of Independent States (CIS) (740 Bq kg−1). Even at this high soil contamination level, radiocesium concentrations in wood do not exceed appreciably the naturally occuring 40K content in the wood (135 Bq kg−1).

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