title: The distribution of (137)Cs, K, Rb and Cs in plants in a Sphagnum-dominated peatland in eastern central Sweden.
abstract: We record the distribution of (137)Cs, K, Rb and Cs within individual Sphagnum plants (down to 20cm depth) as well as (137)Cs in vascular plants growing on a peatland in eastern central Sweden. In Calluna vulgaris(137)Cs was mainly located within the green parts, whereas Andromeda polifolia, Eriophorum vaginatum and Vaccinium oxycoccos showed higher (137)Cs activity in roots. Carex rostrata and Menyanthes trifoliata showed variable distribution of (137)Cs within the plants. The patterns of (137)Cs activity concentration distribution as well as K, Rb and Cs concentrations within individual Sphagnum plants were rather similar and were usually highest in the capitula and/or in the subapical segments and lowest in the lower dead segments, which suggests continuous relocation of those elements to the actively growing apical part. The (137)Cs and K showed relatively weak correlations, especially in capitula and living green segments (0-10cm) of the plant (r=0.50). The strongest correlations were revealed between (137)Cs and Rb (r=0.89), and between (137)Cs and stable Cs (r=0.84). This suggests similarities between (137)Cs and Rb in uptake and relocation within the Sphagnum, but that (137)Cs differs from K.
authors.affiliation: Department of Soil and Environment, Swedish University of Agricultural Sciences, SLU, P.O. Box 7014, SE-750 07 Uppsala, Sweden. mykhailo.vinichuk@mark.slu.se
authors.forename: M
authors.initials: M
authors.lastname: Vinichuk
authors.forename: K J
authors.initials: KJ
authors.lastname: Johanson
authors.forename: H
authors.initials: H
authors.lastname: Rydin
authors.forename: K
authors.initials: K
authors.lastname: Rosén
mesh_terms: D002588:Cesium Radioisotopes / Q000032:analysis* / Q000378:metabolism; D029785:Cyperaceae / Q000378:metabolism; D017753:Ecosystem; D005843:Geography; D010944:Plants / Q000378:metabolism*; D011197:Potassium Radioisotopes / Q000032:analysis* / Q000378:metabolism; D012414:Rubidium Radioisotopes / Q000032:analysis* / Q000378:metabolism; D012990:Soil Pollutants, Radioactive / Q000032:analysis* / Q000378:metabolism; D044003:Sphagnopsida / Q000378:metabolism*; D013548:Sweden; D029796:Vaccinium / Q000378:metabolism; D053833:Wetlands
chemical_list: D002588:Cesium Radioisotopes; D011197:Potassium Radioisotopes; D012414:Rubidium Radioisotopes; D012990:Soil Pollutants, Radioactive