Sonesten L
Department of Limnology, Evolutionary Biology Centre, Uppsala University, Norbyvägen 20, SE-752 36 Uppsala, Sweden.
J Environ Radioact. 2001;55(2):125-43. doi: 10.1016/s0265-931x(00)00187-9.
The environmental influence on Chernobyl-derived 137Cs levels in perch (Perca fluviatilis L.) and roach (Rutilus rutilus L.) was revealed using partial least-squares regression (PLS). The 53 environmental predictors used describe land use in catchment areas, various catchment area and lake characteristics, lake water chemistry, and fish stock composition. The study showed a profound effect of land use on the 137Cs levels in fish. Radiocaesium deposited on arable land was retained in the soil to a greater extent than was 137Cs deposited on wetlands, which more easily leached out to the lake ecosystems. The 137Cs deposition close to the lakes had a more pronounced effect on 137Cs levels in the fish than did more distant deposition. The radiocaesium bioavailability is mainly governed by lake water cation content, as hardwater lakes had significantly lower 137Cs content in fish. Resuspension of 137Cs contaminated sediments only had a limited influence on the observed levels in fish.
利用偏最小二乘回归（PLS）揭示了环境对切尔诺贝利核事故产生的铯-137在鲈鱼（Perca fluviatilis L.）和拟鲤（Rutilus rutilus L.）体内含量的影响。所使用的53个环境预测变量描述了集水区的土地利用情况、各种集水区和湖泊特征、湖水化学性质以及鱼类种群组成。研究表明，土地利用对鱼类体内的铯-137含量有深远影响。沉积在耕地上的放射性铯比沉积在湿地上的铯-137在土壤中的保留程度更高，后者更容易淋溶到湖泊生态系统中。湖泊附近的铯-137沉积对鱼类体内铯-137含量的影响比距离较远的沉积更为显著。放射性铯的生物有效性主要受湖水阳离子含量的控制，因为硬水湖泊中鱼类体内的铯-137含量明显较低。铯-137污染沉积物的再悬浮对观察到的鱼类体内含量影响有限。
