Baeza A, Guillén J, Bernedo J M
Department of Physics, Faculty of Veterinary, University of Extremadura, Avda. Universidad s/n, Cáceres 10071, Spain.
J Environ Radioact. 2005;81(1):89-106. doi: 10.1016/j.jenvrad.2004.12.006.
Soil-fungus transfer coefficients are usually defined as the ratio between the content of the fruiting bodies and that of the soil. Since, however, the methodology of how to determine the soil content is not firmly established, there exist a variety of definitions in the literature. We analyzed the 137Cs, 90Sr, 40K, and 226Ra content of mushroom and soil samples from two pine-wood ecosystems in Spain. The location of the mycelium in the soil profiles of these ecosystems was determined by means of the ergosterol concentration. The results showed the mycelium to generally be localized in the surface layer of soil (0-5 cm). We also carried out a speciation procedure for this layer of soil to determine the different degrees of association of the radionuclides in the soil. The results led us to propose some variations to the traditional definition used in quantifying radionuclide transfer. With these modifications, we were able to analyze Cs-K competition in several species of mycorrhizal and saprophytic fungi.
土壤-真菌转移系数通常定义为子实体含量与土壤含量之比。然而，由于如何确定土壤含量的方法尚未完全确立，文献中存在多种定义。我们分析了来自西班牙两个松林生态系统的蘑菇和土壤样本中的137Cs、90Sr、40K和226Ra含量。通过麦角固醇浓度确定这些生态系统土壤剖面中菌丝体的位置。结果表明，菌丝体通常位于土壤表层（0-5厘米）。我们还对这层土壤进行了形态分析，以确定土壤中放射性核素的不同结合程度。结果促使我们对用于量化放射性核素转移的传统定义提出一些修改。通过这些修改，我们能够分析几种菌根真菌和腐生真菌中的铯-钾竞争。
