Modern parameters of caesium-137 root uptake in natural and agricultural grass ecosystems of contaminated post-Chernobyl landscape, Russia

Abstract

The estimation of modern parameters of 137 Cs root uptake was conducted in natural meadow and agricultural ecosystems of post-Chernobyl landscapes of Tula region. The agrosystems with main crops of field rotation (barley, potatoes, rape, maize) occupying watersheds and slopes with arable chernozems are contaminated at a level 460-670 Bq/kg (4.7-6.0 Ci/km 2); natural meadow ecosystems occupying lower parts of slopes and floodplains are contaminated at a level 620-710 Bq/kg (5.8-7.6 Ci/km 2). In the arable soils 137 Cs uniformly distributed to a depth of Ap horizon (20-30 cm of thickness), while in meadow soils 70-80% of the radionuclide is concentrated within the top Ad horizon (9-13 cm of thickness). These topsoil layer accords with rhizosphere zone, where >80-90% of plant roots are concentrated, and from which 137 Cs is mostly consumed by vegetation. Total amount of 137 Cs root uptake depends on the level of soil radioactive contamination (correlation coefficient 0.61). So 137 Cs activity in meadow vegetation (103-160 Bq/kg) is generally more than one in agricultural vegetation (9-92 Bq/kg). The values of 137 Cs transfer factor in the studied ecosystems vary from 0.01 (rape) to 0.20 (wet meadow), that confirms the discrimination of the radionuclide's root uptake. The larger are the volume of roots and their absorbing surface, the higher are the values of transfer factor from soil to plant (correlation coefficients 0.71 and 0.64 respectively). 137 Cs translocation from roots to shoots is also determined by biological features of plants. At the same level of soil contamination aboveground parts of meadow herbs accumulate more 137 Cs than Gramineae species, and in agrosystems above-ground parts of weeds concentrate more 137 Cs than cultivated cereals. Thus, the level of soil radioactive pollution and biological features of plants are determinants in the process of 137 Cs root uptake and translocation and should be considered in land use policy.

Homo/Heterogeneity of Cs-137 Vertical Distribution Within Plough Horizons of Cultivated Chernozems – 30 Years After Chernobyl Accident

“…All sites were selected within long-term arable fields with crops representing most of the typical cultures of the zonal crop rotation, including wheat, barley, potato, corn, amaranth, soya beans, and leguminous plants. Dominant soils for all the case study sites are represented by the Chernozems leached (WRB-2014 -Luvic Chernozems [10]) characterized by heavy clay loam texture, significant thickness of productive organic horizons (А+АВ varies within a range of 64-78 cm), high humus content (6-7%), neutral reaction (рН range 6.5-7.2) and very well-developed structure of topsoil horizons determining optimal bulk density of 1.1-1.2 g/cm 3 [11].…”