Monira B, Ullah S M, Mollah A S, Chowdhury N
Department of Soil, Water and Environment, University of Dhaka, Dhaka, Bangladesh.
Environ Monit Assess. 2005 May;104(1-3):59-69. doi: 10.1007/s10661-005-1601-0.
A pot experiment was conducted to study the uptake of 137Cs by wheat grown in five representative soils of Bangladesh having different soil characteristics. Artificial application of 137Cs increased the activity in soils up to 45.9 Bq/kg soil, measured at the end of the harvest of wheat crop. Different plant parts had different ability to accumulate 137Cs. Grains had the least activity and transfer factor, while the highest activity and lowest transfer factor were measured in roots, which restricted translocation of 137Cs to wheat straw. The result showed that the transfer factors (mean value) varied from 0.05 to 0.114 in wheat straw, 0.066-0.133 in roots and 0.011-0.043 in wheat grains. The activity and transfer factor of radioactive cesium in wheat plants were found to be greatly influenced by soil properties, i.e. clay content, K, organic matter, CEC, pH, exchangeable ions, etc. Cation exchange capacity and calcium in soils influenced positively, while clay minerals, exchangeable K and organic matter, negatively affected the 137Cs activity concentrations in wheat plants.
进行了一项盆栽试验，以研究在具有不同土壤特性的孟加拉国五种代表性土壤中种植的小麦对137Cs的吸收情况。在小麦作物收获结束时测量，人工施用137Cs使土壤中的活度增加至45.9 Bq/kg土壤。不同的植物部位积累137Cs的能力不同。籽粒的活度和转移因子最低，而根部的活度最高且转移因子最低，这限制了137Cs向小麦秸秆的转运。结果表明，小麦秸秆中的转移因子（平均值）在0.05至0.114之间，根部在0.066 - 0.133之间，小麦籽粒在0.011 - 0.043之间。发现小麦植株中放射性铯的活度和转移因子受土壤性质的显著影响，即粘土含量、钾、有机质、阳离子交换容量、pH值、交换性离子等。土壤中的阳离子交换容量和钙产生积极影响，而粘土矿物、交换性钾和有机质则对小麦植株中137Cs的活度浓度产生负面影响。
