title: Plant induced changes in concentrations of caesium, strontium and uranium in soil solution with reference to major ions and dissolved organic matter.
abstract: For a better understanding of the soil-to-plant transfer of radionuclides, their behavior in the soil solution should be elucidated, especially at the interface between plant roots and soil particles, where conditions differ greatly from the bulk soil because of plant activity. This study determined the concentration of stable Cs and Sr, and U in the soil solution, under plant growing conditions. The leafy vegetable komatsuna (Brassica rapa L.) was cultivated for 26 days in pots, where the rhizosphere soil was separated from the non-rhizosphere soil by a nylon net screen. The concentrations of Cs and Sr in the rhizosphere soil solution decreased with time, and were controlled by K+NH(4)(+) and Ca, respectively. On the other hand, the concentration of U in the rhizosphere soil solution increased with time, and was related to the changes of DOC; however, this relationship was different between the rhizosphere and non-rhizosphere soil.
authors.affiliation: Department of Radioecology, Institute for Environmental Sciences, 1-7 Ienomae, Obuchi, Rokkasho-mura, Kamikita-gun, Aomori 039-3212, Japan. takeda@ies.or.jp
authors.forename: Akira
authors.initials: A
authors.lastname: Takeda
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Tsukada
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Takaku
authors.forename: Naofumi
authors.initials: N
authors.lastname: Akata
authors.forename: Shun'ichi
authors.initials: S
authors.lastname: Hisamatsu
mesh_terms: D002588:Cesium Radioisotopes / Q000032:analysis / Q000378:metabolism; D017753:Ecosystem; D018517:Plant Roots / Q000378:metabolism; D010944:Plants / Q000378:metabolism*; D012987:Soil / Q000032:analysis*; D012990:Soil Pollutants, Radioactive / Q000032:analysis*; D013326:Strontium Radioisotopes / Q000032:analysis / Q000378:metabolism; D014501:Uranium / Q000032:analysis / Q000378:metabolism*
chemical_list: D002588:Cesium Radioisotopes; D012987:Soil; D012990:Soil Pollutants, Radioactive; D013326:Strontium Radioisotopes; D014501:Uranium