title: Development of a dynamic transfer model of (14)C from the atmosphere to rice plants.
abstract: A dynamic compartment model was investigated to describe (14)C accumulation in rice plants exposed to atmospheric (14)C with temporally changing concentrations. In the model, rice plants were regarded to consist of three compartments: the ear and the mobile and immobile carbon pools of the shoot. Photosynthetically fixed carbon moves into the ear and the mobile carbon pool, and these two compartments release a part of this carbon into the atmosphere by respiration. Carbon accumulated in the mobile carbon pool is redistributed to the ear, while carbon transferred into the immobile carbon pool from the mobile one is accumulated there until harvest. The model was examined by cultivation experiments using the stable isotope, (13)C, in which the ratios of carbon photosynthetically fixed at nine times during plant growth to the total carbon at the time of harvest were determined. The model estimates of the ratios were in relatively good agreement with the experimental observations, which implies that the newly developed compartment model is applicable to estimate properly the radiation dose to the neighboring population due to an accidental release of (14)C from nuclear facilities.
authors.affiliation: Institute for Environmental Sciences, 1-7 Ienomae, Obuchi, Rokkasho, Aomori 039-3212, Japan. tani@ies.or.jp
authors.forename: Takashi
authors.initials: T
authors.lastname: Tani
authors.forename: Ryuji
authors.initials: R
authors.lastname: Arai
authors.forename: Susumu
authors.initials: S
authors.lastname: Nozoe
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Tako
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Takahashi
authors.forename: Yuji
authors.initials: Y
authors.lastname: Nakamura
mesh_terms: D001272:Atmosphere / Q000737:chemistry*; D002247:Carbon Isotopes / Q000032:analysis / Q000493:pharmacokinetics; D002250:Carbon Radioisotopes / Q000032:analysis / Q000493:pharmacokinetics*; D008954:Models, Biological; D012275:Oryza / Q000254:growth & development / Q000378:metabolism*
chemical_list: D002247:Carbon Isotopes; D002250:Carbon Radioisotopes