Riesen T K, Egli J, Andres R Y
Paul Scherrer Institut, Radioecology, OSUA/105, Villigen PSI, Switzerland.
Radiat Environ Biophys. 1998 Feb;36(4):293-6. doi: 10.1007/s004110050084.
The results of a greenhouse experiment on the translocation rate of 134Cs from potato leaves to tubers were compared with calculations of the radioecological model ECOSYS-87 and other literature values. The 134Cs activities applied at three development stages (three pinnate leaves fully developed, onset of flowering, onset of yellowing) to leaves of the plant were taken as starting points for the model to calculate the activity in the tubers at harvest. The default yield in the model was replaced by the experimentally obtained values. The translocation rate measured in the greenhouse experiment was 4 to 14 times higher than the calculations of the model. Some possible reasons for such a high translocation rate, compared with the literature data, are discussed. Based on these comparisons, it is concluded that maximal translocation occurs at the growth stage of flowering of a crop and that the development stage of a crop might be a stronger parameter to describe the time dependency of translocation than the usually applied parameter 'days before harvest'.
将一项关于¹³⁴Cs从马铃薯叶片向块茎转运率的温室实验结果，与放射性生态模型ECOSYS - 87的计算结果及其他文献值进行了比较。在三个发育阶段（三片羽状叶完全展开、开花初期、发黄初期）施加到植株叶片上的¹³⁴Cs活度，被用作模型计算收获时块茎中活度的起始点。模型中的默认产量被实验获得的值所取代。温室实验中测得的转运率比模型计算结果高4至14倍。讨论了与文献数据相比，出现如此高转运率的一些可能原因。基于这些比较，得出结论：最大转运发生在作物开花生长阶段，并且作物的发育阶段可能是比通常应用的参数“收获前天数”更强的描述转运时间依赖性的参数。
